HaskellerZ 2021-04-29 meetup slides
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Simon Michael
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SLUG=haskellerz
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TYPES=\
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slidy \
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revealjs \
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# dzslides \
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# s5 \
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# slideous \
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default: build open watch
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open:
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open *.html
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build:
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for T in $(TYPES); do pandoc --slide-level=2 -s -t $$T $(SLUG).md -o $(SLUG).$$T.html; done
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watch:
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ls *.md | entr bash -c 'make -s build && date'
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clean:
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rm -f $(SLUG).*.html
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README.org
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* Haskellerz talk 2021-04-29
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** blurb
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Inside hledger: an architectural tour and how-to
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hledger is a suite of CLI, TUI and WUI tools, file formats, and
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documentation for doing accounting with plain text. It is something
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that's not yet common: an end-user application written in Haskell,
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that aims to be easy to install, robust and pleasing to use, on all
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major platforms, including by non-techies.
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I have been building and growing hledger and the hledger project for
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about 15 years. In this talk I will, after a quick intro to plain text
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accounting and hledger, give a tour of hledger's architecture,
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codebase, significant evolutions, and some design principles. Then
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I'll give some practical tips on how to: add your own custom hledger
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commands; use hledger from your own app; troubleshoot hledger
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behaviour; investigate bugs; and create effective pull requests. This
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will hopefully go smoothly, and the Q&A we can go deeper on whatever
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you like.
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Simon: https://joyful.com
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hledger: https://hledger.org
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Plain Text Accounting: https://plaintextaccounting.org
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** preliminary outline
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*** Inside hledger: an architectural tour and how-to
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**** quick intro to accounting, plain text accounting, hledger
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10m
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**** project goals
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**** a look at the essential functionality in its earliest/simplest form
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**** a fast run through the evolution since then
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**** a tour of the codebase and project today (2021Q2)
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**** design principles
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25m
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**** how to script hledger
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**** how to integrate hledger in your app
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***** run cli, capture csv/json
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***** run hledger-web, use http-json api
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***** link with hledger-lib and/or other hledger packages, call public functions
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**** how to investigate a hledger bug
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***** basic troubleshooting - docs, comparison, minimisation, reproduction, support
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***** code debugging
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**** how to submit a pull request
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25m
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**** Q & A
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30m
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356
haskellerz.md
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% Inside hledger: an architectural tour and how-to
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% Simon Michael
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% April 29, 2021
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# Introductions
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`0:00 (10m)`
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## Who am I ?
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Simon Michael\
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Independent software consultant and developer.\
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<!-- Currently based in Hawaii. -->
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<https://joyful.com>
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Started in the home computer era (Ireland, 80s). ZX-80, Pet, VIC, C64, Amiga, PC, Mac, VAX/VMS, unix..
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FOSS fan, contributor, project leader. Two big projects:
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- **Zwiki**, 1996-2006, wiki engine, Python/Zope
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- **hledger**, 2006-present, accounting tool, Haskell
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## Overview of talk
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- A quick intro to plain text accounting and hledger. (10m)
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- A tour of hledger's
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architecture,
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codebase,
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evolutions,
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and design principles. (25m)
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- How to script and develop hledger:
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custom commands,
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calling from other apps,
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troubleshooting,
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bug investigation,
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effective pull requests. (25m)
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- Q&A to go deeper on whatever you like. (30m)
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## What's Plain Text Accounting ?
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A name I proposed (and a website I built) to help unify and grow the
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communities around
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Ledger, hledger, Beancount and similar accounting
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tools.
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<https://plaintextaccounting.org>
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## The PTA ecosystem
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The "big three" apps:
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* **Ledger** - John Wiegley's pioneering command line accounting app,
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inspiration for all the rest.\
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C++, 2003-present
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* **hledger** - Simon Michael's rewrite/remix.\
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Haskell, 2007-present
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* **Beancount** - Martin Blais' variant.\
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Python, 2008-present
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Many more apps and add-on tools - <https://plaintextaccounting.org/#software>
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## What's hledger ?
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A suite of
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tools,
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file formats,
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and documentation
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for doing "plain text accounting".
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<https://hledger.org>
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## A successful FOSS project
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15 years, 134 contributors, 80-100 chatters, some number of happy
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users, useful to me every week.
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Reasonably successful.
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Not fulfilling my original goal of being financially
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self-sustaining and minimally time-consuming !
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## An end-user Haskell application
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hledger is something that's not yet common:
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An end user application (ie: not a programming tool),
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written in Haskell, that aims to be
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- easy to install,
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- dependable,
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- and pleasing to use,
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- on all major platforms,
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- by non-techies as well as power users.
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## Tools
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* hledger
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* hledger-ui
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* hledger-web
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* hledger-iadd
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* hledger-interest
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* etc.
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## File formats
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* journal
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* csv
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* timeclock
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* timedot
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## Documentation
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* introductory
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* reference
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* cookbook
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* developer
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# Architecture
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`0:10 (25m)`
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## hledger project goals
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I was a Ledger user and new Haskeller. I started hledger with many goals:
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- acquire a more robust, usable, evolving incarnation of Ledger
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- develop a consistent, effective accounting habit
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- get better at Haskell
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- find out if Haskell was good for end-user apps and maintainer productivity
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- grow a useful, long-lasting, financially sustainable FOSS accounting project
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## A fast run through the evolution
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- First commit
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- First types
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- First report
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- Balance report
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- Multi-column balance report
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- Stateful parser
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- Web interface
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- Curses interface
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- Package split
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- Speed, features
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- General currency conversion
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- Valuation
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- Always documentation
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## A tour of the codebase and project today (2021Q2)
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## Design principles
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# How to..
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`0:35 (25m)`
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## Script hledger
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## Integrate hledger in your app
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### Run cli, capture csv/json
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### Run hledger-web, use http-json api
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### Link with hledger-lib and/or other hledger packages, call public functions
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## Investigate a hledger bug
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### Basic troubleshooting - docs, comparison, minimisation, reproduction, support
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### Code debugging
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## How to submit a pull request
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# Q & A
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`1:00 (30m)`
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# End
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`1:30`
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```
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$ git shortlog -s
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Aerex
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Aiken Cairncross
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Alejandro García Montoro
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Aleksandar Dimitrov
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Alex Chen
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Alvaro Fernando García
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Amarandus
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Amitai Burstein
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Andreas Pauley
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Andrew Jones
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Andriy Mykhaylyk
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Arnout Engelen
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Ben Boeckel
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Ben Creasy
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Boyd Kelly
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Brian Scott
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Brian Wignall
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Bryan Richter
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Caleb Maclennan
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Carel Fellinger
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Carl Richard Theodor Schneider
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Carlos Lopez-Camey
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Christian G. Warden
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Christoph Nicolai
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Clint Adams
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Colin Woodbury
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Damien Cassou
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David Reaver
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David Zhang
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Dmitry Astapov
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Dominik Süß
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Doug Goldstein
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Eli Flanagan
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Elijah Caine
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Eric Kow
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Eric Mertens
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Everett Hildenbrandt
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Evilham
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Felix Van der Jeugt
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Felix Yan
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Fun Ilrys (Nissar Chababy)
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Gabriel Ebner
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Gaith Hallak
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Gergely Risko
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Hans-Peter Deifel
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Henning Thielemann
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Imuli
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Jacek Generowicz
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Jacob Weisz
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Jakob Schöttl
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Jakub Zárybnický
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Jan Zerebecki
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Jeff Richards
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Jesse Rosenthal
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Joachim Breitner
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Joe Horsnell
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Johann Klähn
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Johannes Gerer
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John Wiegley
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Joseph Weston
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Joshua Chia
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Joshua Kehn
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Judah Jacobson
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Julien Moutinho
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Justin Le
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Kyle Marek-Spartz
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Luca Molteni
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Léo Gaspard
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M Parker
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Malte Brandy
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Mark Hansen
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Marko Kocić
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Martin Michlmayr
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Mateus Furquim
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Matthias Kauer
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Max Bolingbroke
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Michael Kainer
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Michael Sanders
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Michael Snoyman
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Michael Walker
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Mick Dekkers
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Mitchell Rosen
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Moritz Kiefer
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Mykola Orliuk
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Nadrieril
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Nicholas Niro
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Nick Ingolia
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Nicolas Wavrant
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Nikhil Jha
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Nissar Chababy
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Nolan Darilek
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Oliver Braun
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Omari Norman
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Pavan Rikhi
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Pavlo Kerestey
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Peter Simons
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||||||
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Pia Mancini
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||||||
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Rick Lupton
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Roman Cheplyaka
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||||||
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Rui Chen
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Ryan Desfosses
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Sam Doshi
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Sam Jeeves
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||||||
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Samuel May
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Sergei Trofimovich
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Sergey Astanin
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Shubham Lagwankar
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||||||
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Simon Hengel
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Simon Michael
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SpicyCat
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||||||
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Stefano Rodighiero
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Stephen Morgan
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Steven R. Baker
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TANIGUCHI Kohei
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Thomas R. Koll
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Tim Docker
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Timofey ZAKREVSKIY
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Trygve Laugstøl
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||||||
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Vladimir Sorokin
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||||||
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Vladimir Zhelezov
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||||||
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Wad
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||||||
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Xinruo Sun
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afarrow
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agander
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aragaer
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awjchen
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azure-pipelines[bot]
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flip111
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gwern
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jeevcat
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jungle-boogie
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legrostdg
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trevorriles
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zieone
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```
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<!--
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By default, the slide level is the highest heading level in the
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headings are always followed by level-2 headings, which are followed
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by content, so the slide level is 2. This default can be overridden
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using the --slide-level option.
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The document is carved up into slides according to the following rules:
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Headings above the slide level in the hierarchy create “title slides,” which just contain the section title and help to break the slide show into sections. Non-slide content under these headings will be included on the title slide (for HTML slide shows) or in a subsequent slide with the same title (for beamer).
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-->
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380
haskellerz.revealjs.html
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380
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="generator" content="pandoc">
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<meta name="author" content="Simon Michael">
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<meta name="dcterms.date" content="2021-04-29">
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<title>Inside hledger: an architectural tour and how-to</title>
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
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||||||
|
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
|
||||||
|
<link rel="stylesheet" href="https://unpkg.com/reveal.js@^4//dist/reset.css">
|
||||||
|
<link rel="stylesheet" href="https://unpkg.com/reveal.js@^4//dist/reveal.css">
|
||||||
|
<style>
|
||||||
|
code{white-space: pre-wrap;}
|
||||||
|
span.smallcaps{font-variant: small-caps;}
|
||||||
|
span.underline{text-decoration: underline;}
|
||||||
|
div.column{display: inline-block; vertical-align: top; width: 50%;}
|
||||||
|
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
|
||||||
|
ul.task-list{list-style: none;}
|
||||||
|
.display.math{display: block; text-align: center; margin: 0.5rem auto;}
|
||||||
|
</style>
|
||||||
|
<link rel="stylesheet" href="https://unpkg.com/reveal.js@^4//dist/theme/black.css" id="theme">
|
||||||
|
</head>
|
||||||
|
<body>
|
||||||
|
<div class="reveal">
|
||||||
|
<div class="slides">
|
||||||
|
|
||||||
|
<section id="title-slide">
|
||||||
|
<h1 class="title">Inside hledger: an architectural tour and how-to</h1>
|
||||||
|
<p class="author">Simon Michael</p>
|
||||||
|
<p class="date">April 29, 2021</p>
|
||||||
|
</section>
|
||||||
|
|
||||||
|
<section>
|
||||||
|
<section id="introductions" class="title-slide slide level1">
|
||||||
|
<h1>Introductions</h1>
|
||||||
|
<p><code>0:00 (10m)</code></p>
|
||||||
|
</section>
|
||||||
|
<section id="who-am-i" class="slide level2">
|
||||||
|
<h2>Who am I ?</h2>
|
||||||
|
<p>Simon Michael<br />
|
||||||
|
Independent software consultant and developer.<br />
|
||||||
|
<!-- Currently based in Hawaii. --> <a href="https://joyful.com" class="uri">https://joyful.com</a></p>
|
||||||
|
<p>Started in the home computer era (Ireland, 80s). ZX-80, Pet, VIC, C64, Amiga, PC, Mac, VAX/VMS, unix..</p>
|
||||||
|
<p>FOSS fan, contributor, project leader. Two big projects:</p>
|
||||||
|
<ul>
|
||||||
|
<li><p><strong>Zwiki</strong>, 1996-2006, wiki engine, Python/Zope</p></li>
|
||||||
|
<li><p><strong>hledger</strong>, 2006-present, accounting tool, Haskell</p></li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="overview-of-talk" class="slide level2">
|
||||||
|
<h2>Overview of talk</h2>
|
||||||
|
<ul>
|
||||||
|
<li><p>A quick intro to plain text accounting and hledger. (10m)</p></li>
|
||||||
|
<li><p>A tour of hledger’s architecture, codebase, evolutions, and design principles. (25m)</p></li>
|
||||||
|
<li><p>How to script and develop hledger: custom commands, calling from other apps, troubleshooting, bug investigation, effective pull requests. (25m)</p></li>
|
||||||
|
<li><p>Q&A to go deeper on whatever you like. (30m)</p></li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="whats-plain-text-accounting" class="slide level2">
|
||||||
|
<h2>What’s Plain Text Accounting ?</h2>
|
||||||
|
<p>A name I proposed (and a website I built) to help unify and grow the communities around Ledger, hledger, Beancount and similar accounting tools.</p>
|
||||||
|
<p><a href="https://plaintextaccounting.org" class="uri">https://plaintextaccounting.org</a></p>
|
||||||
|
</section>
|
||||||
|
<section id="the-pta-ecosystem" class="slide level2">
|
||||||
|
<h2>The PTA ecosystem</h2>
|
||||||
|
<p>The “big three” apps:</p>
|
||||||
|
<ul>
|
||||||
|
<li><p><strong>Ledger</strong> - John Wiegley’s pioneering command line accounting app, inspiration for all the rest.<br />
|
||||||
|
C++, 2003-present</p></li>
|
||||||
|
<li><p><strong>hledger</strong> - Simon Michael’s rewrite/remix.<br />
|
||||||
|
Haskell, 2007-present</p></li>
|
||||||
|
<li><p><strong>Beancount</strong> - Martin Blais’ variant.<br />
|
||||||
|
Python, 2008-present</p></li>
|
||||||
|
</ul>
|
||||||
|
<p>Many more apps and add-on tools - <a href="https://plaintextaccounting.org/#software" class="uri">https://plaintextaccounting.org/#software</a></p>
|
||||||
|
</section>
|
||||||
|
<section id="whats-hledger" class="slide level2">
|
||||||
|
<h2>What’s hledger ?</h2>
|
||||||
|
<p>A suite of tools, file formats, and documentation for doing “plain text accounting”.</p>
|
||||||
|
<p><a href="https://hledger.org" class="uri">https://hledger.org</a></p>
|
||||||
|
</section>
|
||||||
|
<section id="a-successful-foss-project" class="slide level2">
|
||||||
|
<h2>A successful FOSS project</h2>
|
||||||
|
<p>15 years, 134 contributors, 80-100 chatters, some number of happy users, useful to me every week.</p>
|
||||||
|
<p>Reasonably successful.</p>
|
||||||
|
<p>Not fulfilling my original goal of being financially self-sustaining and minimally time-consuming !</p>
|
||||||
|
</section>
|
||||||
|
<section id="an-end-user-haskell-application" class="slide level2">
|
||||||
|
<h2>An end-user Haskell application</h2>
|
||||||
|
<p>hledger is something that’s not yet common:</p>
|
||||||
|
<p>An end user application (ie: not a programming tool), written in Haskell, that aims to be</p>
|
||||||
|
<ul>
|
||||||
|
<li>easy to install,</li>
|
||||||
|
<li>dependable,</li>
|
||||||
|
<li>and pleasing to use,</li>
|
||||||
|
<li>on all major platforms,</li>
|
||||||
|
<li>by non-techies as well as power users.</li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="tools" class="slide level2">
|
||||||
|
<h2>Tools</h2>
|
||||||
|
<ul>
|
||||||
|
<li>hledger</li>
|
||||||
|
<li>hledger-ui</li>
|
||||||
|
<li>hledger-web</li>
|
||||||
|
<li>hledger-iadd</li>
|
||||||
|
<li>hledger-interest</li>
|
||||||
|
<li>etc.</li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="file-formats" class="slide level2">
|
||||||
|
<h2>File formats</h2>
|
||||||
|
<ul>
|
||||||
|
<li>journal</li>
|
||||||
|
<li>csv</li>
|
||||||
|
<li>timeclock</li>
|
||||||
|
<li>timedot</li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="documentation" class="slide level2">
|
||||||
|
<h2>Documentation</h2>
|
||||||
|
<ul>
|
||||||
|
<li>introductory</li>
|
||||||
|
<li>reference</li>
|
||||||
|
<li>cookbook</li>
|
||||||
|
<li>developer</li>
|
||||||
|
</ul>
|
||||||
|
</section></section>
|
||||||
|
<section>
|
||||||
|
<section id="architecture" class="title-slide slide level1">
|
||||||
|
<h1>Architecture</h1>
|
||||||
|
<p><code>0:10 (25m)</code></p>
|
||||||
|
</section>
|
||||||
|
<section id="hledger-project-goals" class="slide level2">
|
||||||
|
<h2>hledger project goals</h2>
|
||||||
|
<p>I was a Ledger user and new Haskeller. I started hledger with many goals:</p>
|
||||||
|
<ul>
|
||||||
|
<li>acquire a more robust, usable, evolving incarnation of Ledger</li>
|
||||||
|
<li>develop a consistent, effective accounting habit</li>
|
||||||
|
<li>get better at Haskell</li>
|
||||||
|
<li>find out if Haskell was good for end-user apps and maintainer productivity</li>
|
||||||
|
<li>grow a useful, long-lasting, financially sustainable FOSS accounting project</li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="a-fast-run-through-the-evolution" class="slide level2">
|
||||||
|
<h2>A fast run through the evolution</h2>
|
||||||
|
<ul>
|
||||||
|
<li>First commit</li>
|
||||||
|
<li>First types</li>
|
||||||
|
<li>First report</li>
|
||||||
|
<li>Balance report</li>
|
||||||
|
<li>Multi-column balance report</li>
|
||||||
|
<li>Stateful parser</li>
|
||||||
|
<li>Web interface</li>
|
||||||
|
<li>Curses interface</li>
|
||||||
|
<li>Package split</li>
|
||||||
|
<li>Speed, features</li>
|
||||||
|
<li>General currency conversion</li>
|
||||||
|
<li>Valuation</li>
|
||||||
|
<li>Always documentation</li>
|
||||||
|
</ul>
|
||||||
|
</section>
|
||||||
|
<section id="a-tour-of-the-codebase-and-project-today-2021q2" class="slide level2">
|
||||||
|
<h2>A tour of the codebase and project today (2021Q2)</h2>
|
||||||
|
</section>
|
||||||
|
<section id="design-principles" class="slide level2">
|
||||||
|
<h2>Design principles</h2>
|
||||||
|
</section></section>
|
||||||
|
<section>
|
||||||
|
<section id="how-to.." class="title-slide slide level1">
|
||||||
|
<h1>How to..</h1>
|
||||||
|
<p><code>0:35 (25m)</code></p>
|
||||||
|
</section>
|
||||||
|
<section id="script-hledger" class="slide level2">
|
||||||
|
<h2>Script hledger</h2>
|
||||||
|
</section>
|
||||||
|
<section id="integrate-hledger-in-your-app" class="slide level2">
|
||||||
|
<h2>Integrate hledger in your app</h2>
|
||||||
|
<h3 id="run-cli-capture-csvjson">Run cli, capture csv/json</h3>
|
||||||
|
<h3 id="run-hledger-web-use-http-json-api">Run hledger-web, use http-json api</h3>
|
||||||
|
<h3 id="link-with-hledger-lib-andor-other-hledger-packages-call-public-functions">Link with hledger-lib and/or other hledger packages, call public functions</h3>
|
||||||
|
</section>
|
||||||
|
<section id="investigate-a-hledger-bug" class="slide level2">
|
||||||
|
<h2>Investigate a hledger bug</h2>
|
||||||
|
<h3 id="basic-troubleshooting---docs-comparison-minimisation-reproduction-support">Basic troubleshooting - docs, comparison, minimisation, reproduction, support</h3>
|
||||||
|
<h3 id="code-debugging">Code debugging</h3>
|
||||||
|
</section>
|
||||||
|
<section id="how-to-submit-a-pull-request" class="slide level2">
|
||||||
|
<h2>How to submit a pull request</h2>
|
||||||
|
</section></section>
|
||||||
|
<section id="q-a" class="title-slide slide level1">
|
||||||
|
<h1>Q & A</h1>
|
||||||
|
<p><code>1:00 (30m)</code></p>
|
||||||
|
</section>
|
||||||
|
|
||||||
|
<section id="end" class="title-slide slide level1">
|
||||||
|
<h1>End</h1>
|
||||||
|
<p><code>1:30</code></p>
|
||||||
|
<pre><code>$ git shortlog -s
|
||||||
|
Aerex
|
||||||
|
Aiken Cairncross
|
||||||
|
Alejandro García Montoro
|
||||||
|
Aleksandar Dimitrov
|
||||||
|
Alex Chen
|
||||||
|
Alvaro Fernando García
|
||||||
|
Amarandus
|
||||||
|
Amitai Burstein
|
||||||
|
Andreas Pauley
|
||||||
|
Andrew Jones
|
||||||
|
Andriy Mykhaylyk
|
||||||
|
Arnout Engelen
|
||||||
|
Ben Boeckel
|
||||||
|
Ben Creasy
|
||||||
|
Boyd Kelly
|
||||||
|
Brian Scott
|
||||||
|
Brian Wignall
|
||||||
|
Bryan Richter
|
||||||
|
Caleb Maclennan
|
||||||
|
Carel Fellinger
|
||||||
|
Carl Richard Theodor Schneider
|
||||||
|
Carlos Lopez-Camey
|
||||||
|
Christian G. Warden
|
||||||
|
Christoph Nicolai
|
||||||
|
Clint Adams
|
||||||
|
Colin Woodbury
|
||||||
|
Damien Cassou
|
||||||
|
David Reaver
|
||||||
|
David Zhang
|
||||||
|
Dmitry Astapov
|
||||||
|
Dominik Süß
|
||||||
|
Doug Goldstein
|
||||||
|
Eli Flanagan
|
||||||
|
Elijah Caine
|
||||||
|
Eric Kow
|
||||||
|
Eric Mertens
|
||||||
|
Everett Hildenbrandt
|
||||||
|
Evilham
|
||||||
|
Felix Van der Jeugt
|
||||||
|
Felix Yan
|
||||||
|
Fun Ilrys (Nissar Chababy)
|
||||||
|
Gabriel Ebner
|
||||||
|
Gaith Hallak
|
||||||
|
Gergely Risko
|
||||||
|
Hans-Peter Deifel
|
||||||
|
Henning Thielemann
|
||||||
|
Imuli
|
||||||
|
Jacek Generowicz
|
||||||
|
Jacob Weisz
|
||||||
|
Jakob Schöttl
|
||||||
|
Jakub Zárybnický
|
||||||
|
Jan Zerebecki
|
||||||
|
Jeff Richards
|
||||||
|
Jesse Rosenthal
|
||||||
|
Joachim Breitner
|
||||||
|
Joe Horsnell
|
||||||
|
Johann Klähn
|
||||||
|
Johannes Gerer
|
||||||
|
John Wiegley
|
||||||
|
Joseph Weston
|
||||||
|
Joshua Chia
|
||||||
|
Joshua Kehn
|
||||||
|
Judah Jacobson
|
||||||
|
Julien Moutinho
|
||||||
|
Justin Le
|
||||||
|
Kyle Marek-Spartz
|
||||||
|
Luca Molteni
|
||||||
|
Léo Gaspard
|
||||||
|
M Parker
|
||||||
|
Malte Brandy
|
||||||
|
Mark Hansen
|
||||||
|
Marko Kocić
|
||||||
|
Martin Michlmayr
|
||||||
|
Mateus Furquim
|
||||||
|
Matthias Kauer
|
||||||
|
Max Bolingbroke
|
||||||
|
Michael Kainer
|
||||||
|
Michael Sanders
|
||||||
|
Michael Snoyman
|
||||||
|
Michael Walker
|
||||||
|
Mick Dekkers
|
||||||
|
Mitchell Rosen
|
||||||
|
Moritz Kiefer
|
||||||
|
Mykola Orliuk
|
||||||
|
Nadrieril
|
||||||
|
Nicholas Niro
|
||||||
|
Nick Ingolia
|
||||||
|
Nicolas Wavrant
|
||||||
|
Nikhil Jha
|
||||||
|
Nissar Chababy
|
||||||
|
Nolan Darilek
|
||||||
|
Oliver Braun
|
||||||
|
Omari Norman
|
||||||
|
Pavan Rikhi
|
||||||
|
Pavlo Kerestey
|
||||||
|
Peter Simons
|
||||||
|
Pia Mancini
|
||||||
|
Rick Lupton
|
||||||
|
Roman Cheplyaka
|
||||||
|
Rui Chen
|
||||||
|
Ryan Desfosses
|
||||||
|
Sam Doshi
|
||||||
|
Sam Jeeves
|
||||||
|
Samuel May
|
||||||
|
Sergei Trofimovich
|
||||||
|
Sergey Astanin
|
||||||
|
Shubham Lagwankar
|
||||||
|
Simon Hengel
|
||||||
|
Simon Michael
|
||||||
|
SpicyCat
|
||||||
|
Stefano Rodighiero
|
||||||
|
Stephen Morgan
|
||||||
|
Steven R. Baker
|
||||||
|
TANIGUCHI Kohei
|
||||||
|
Thomas R. Koll
|
||||||
|
Tim Docker
|
||||||
|
Timofey ZAKREVSKIY
|
||||||
|
Trygve Laugstøl
|
||||||
|
Vladimir Sorokin
|
||||||
|
Vladimir Zhelezov
|
||||||
|
Wad
|
||||||
|
Xinruo Sun
|
||||||
|
afarrow
|
||||||
|
agander
|
||||||
|
aragaer
|
||||||
|
awjchen
|
||||||
|
azure-pipelines[bot]
|
||||||
|
flip111
|
||||||
|
gwern
|
||||||
|
jeevcat
|
||||||
|
jungle-boogie
|
||||||
|
legrostdg
|
||||||
|
trevorriles
|
||||||
|
zieone</code></pre>
|
||||||
|
<!--
|
||||||
|
https://pandoc.org/MANUAL.html#slide-shows
|
||||||
|
|
||||||
|
By default, the slide level is the highest heading level in the
|
||||||
|
hierarchy that is followed immediately by content, and not another
|
||||||
|
heading, somewhere in the document. In the example above, level-1
|
||||||
|
headings are always followed by level-2 headings, which are followed
|
||||||
|
by content, so the slide level is 2. This default can be overridden
|
||||||
|
using the --slide-level option.
|
||||||
|
|
||||||
|
The document is carved up into slides according to the following rules:
|
||||||
|
A horizontal rule always starts a new slide.
|
||||||
|
A heading at the slide level always starts a new slide.
|
||||||
|
Headings below the slide level in the hierarchy create headings within a slide.
|
||||||
|
Headings above the slide level in the hierarchy create “title slides,” which just contain the section title and help to break the slide show into sections. Non-slide content under these headings will be included on the title slide (for HTML slide shows) or in a subsequent slide with the same title (for beamer).
|
||||||
|
-->
|
||||||
|
</section>
|
||||||
|
</div>
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<script src="https://unpkg.com/reveal.js@^4//dist/reveal.js"></script>
|
||||||
|
|
||||||
|
// reveal.js plugins
|
||||||
|
<script src="https://unpkg.com/reveal.js@^4//plugin/notes/notes.js"></script>
|
||||||
|
<script src="https://unpkg.com/reveal.js@^4//plugin/search/search.js"></script>
|
||||||
|
<script src="https://unpkg.com/reveal.js@^4//plugin/zoom/zoom.js"></script>
|
||||||
|
|
||||||
|
<script>
|
||||||
|
|
||||||
|
// Full list of configuration options available at:
|
||||||
|
// https://revealjs.com/config/
|
||||||
|
Reveal.initialize({
|
||||||
|
// Push each slide change to the browser history
|
||||||
|
history: true,
|
||||||
|
|
||||||
|
// reveal.js plugins
|
||||||
|
plugins: [
|
||||||
|
RevealNotes,
|
||||||
|
RevealSearch,
|
||||||
|
RevealZoom
|
||||||
|
]
|
||||||
|
});
|
||||||
|
</script>
|
||||||
|
</body>
|
||||||
|
</html>
|
||||||
353
haskellerz.slidy.html
Normal file
353
haskellerz.slidy.html
Normal file
@ -0,0 +1,353 @@
|
|||||||
|
<?xml version="1.0" encoding="utf-8"?>
|
||||||
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
|
||||||
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
||||||
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
||||||
|
<head>
|
||||||
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||||||
|
<meta http-equiv="Content-Style-Type" content="text/css" />
|
||||||
|
<meta name="generator" content="pandoc" />
|
||||||
|
<meta name="author" content="Simon Michael" />
|
||||||
|
<meta name="date" content="2021-04-29" />
|
||||||
|
<title>Inside hledger: an architectural tour and how-to</title>
|
||||||
|
<style type="text/css">
|
||||||
|
code{white-space: pre-wrap;}
|
||||||
|
span.smallcaps{font-variant: small-caps;}
|
||||||
|
span.underline{text-decoration: underline;}
|
||||||
|
div.column{display: inline-block; vertical-align: top; width: 50%;}
|
||||||
|
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
|
||||||
|
ul.task-list{list-style: none;}
|
||||||
|
.display.math{display: block; text-align: center; margin: 0.5rem auto;}
|
||||||
|
</style>
|
||||||
|
<link rel="stylesheet" type="text/css" media="screen, projection, print"
|
||||||
|
href="https://www.w3.org/Talks/Tools/Slidy2/styles/slidy.css" />
|
||||||
|
<script src="https://www.w3.org/Talks/Tools/Slidy2/scripts/slidy.js"
|
||||||
|
charset="utf-8" type="text/javascript"></script>
|
||||||
|
</head>
|
||||||
|
<body>
|
||||||
|
<div class="slide titlepage">
|
||||||
|
<h1 class="title">Inside hledger: an architectural tour and how-to</h1>
|
||||||
|
<p class="author">
|
||||||
|
Simon Michael
|
||||||
|
</p>
|
||||||
|
<p class="date">April 29, 2021</p>
|
||||||
|
</div>
|
||||||
|
<div id="introductions" class="title-slide slide section level1">
|
||||||
|
<h1>Introductions</h1>
|
||||||
|
<p><code>0:00 (10m)</code></p>
|
||||||
|
</div>
|
||||||
|
<div id="who-am-i" class="slide section level2">
|
||||||
|
<h1>Who am I ?</h1>
|
||||||
|
<p>Simon Michael<br />
|
||||||
|
Independent software consultant and developer.<br />
|
||||||
|
<!-- Currently based in Hawaii. --> <a href="https://joyful.com" class="uri">https://joyful.com</a></p>
|
||||||
|
<p>Started in the home computer era (Ireland, 80s). ZX-80, Pet, VIC, C64, Amiga, PC, Mac, VAX/VMS, unix..</p>
|
||||||
|
<p>FOSS fan, contributor, project leader. Two big projects:</p>
|
||||||
|
<ul>
|
||||||
|
<li><p><strong>Zwiki</strong>, 1996-2006, wiki engine, Python/Zope</p></li>
|
||||||
|
<li><p><strong>hledger</strong>, 2006-present, accounting tool, Haskell</p></li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="overview-of-talk" class="slide section level2">
|
||||||
|
<h1>Overview of talk</h1>
|
||||||
|
<ul>
|
||||||
|
<li><p>A quick intro to plain text accounting and hledger. (10m)</p></li>
|
||||||
|
<li><p>A tour of hledger’s architecture, codebase, evolutions, and design principles. (25m)</p></li>
|
||||||
|
<li><p>How to script and develop hledger: custom commands, calling from other apps, troubleshooting, bug investigation, effective pull requests. (25m)</p></li>
|
||||||
|
<li><p>Q&A to go deeper on whatever you like. (30m)</p></li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="whats-plain-text-accounting" class="slide section level2">
|
||||||
|
<h1>What’s Plain Text Accounting ?</h1>
|
||||||
|
<p>A name I proposed (and a website I built) to help unify and grow the communities around Ledger, hledger, Beancount and similar accounting tools.</p>
|
||||||
|
<p><a href="https://plaintextaccounting.org" class="uri">https://plaintextaccounting.org</a></p>
|
||||||
|
</div>
|
||||||
|
<div id="the-pta-ecosystem" class="slide section level2">
|
||||||
|
<h1>The PTA ecosystem</h1>
|
||||||
|
<p>The “big three” apps:</p>
|
||||||
|
<ul>
|
||||||
|
<li><p><strong>Ledger</strong> - John Wiegley’s pioneering command line accounting app, inspiration for all the rest.<br />
|
||||||
|
C++, 2003-present</p></li>
|
||||||
|
<li><p><strong>hledger</strong> - Simon Michael’s rewrite/remix.<br />
|
||||||
|
Haskell, 2007-present</p></li>
|
||||||
|
<li><p><strong>Beancount</strong> - Martin Blais’ variant.<br />
|
||||||
|
Python, 2008-present</p></li>
|
||||||
|
</ul>
|
||||||
|
<p>Many more apps and add-on tools - <a href="https://plaintextaccounting.org/#software" class="uri">https://plaintextaccounting.org/#software</a></p>
|
||||||
|
</div>
|
||||||
|
<div id="whats-hledger" class="slide section level2">
|
||||||
|
<h1>What’s hledger ?</h1>
|
||||||
|
<p>A suite of tools, file formats, and documentation for doing “plain text accounting”.</p>
|
||||||
|
<p><a href="https://hledger.org" class="uri">https://hledger.org</a></p>
|
||||||
|
</div>
|
||||||
|
<div id="a-successful-foss-project" class="slide section level2">
|
||||||
|
<h1>A successful FOSS project</h1>
|
||||||
|
<p>15 years, 134 contributors, 80-100 chatters, some number of happy users, useful to me every week.</p>
|
||||||
|
<p>Reasonably successful.</p>
|
||||||
|
<p>Not fulfilling my original goal of being financially self-sustaining and minimally time-consuming !</p>
|
||||||
|
</div>
|
||||||
|
<div id="an-end-user-haskell-application" class="slide section level2">
|
||||||
|
<h1>An end-user Haskell application</h1>
|
||||||
|
<p>hledger is something that’s not yet common:</p>
|
||||||
|
<p>An end user application (ie: not a programming tool), written in Haskell, that aims to be</p>
|
||||||
|
<ul>
|
||||||
|
<li>easy to install,</li>
|
||||||
|
<li>dependable,</li>
|
||||||
|
<li>and pleasing to use,</li>
|
||||||
|
<li>on all major platforms,</li>
|
||||||
|
<li>by non-techies as well as power users.</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="tools" class="slide section level2">
|
||||||
|
<h1>Tools</h1>
|
||||||
|
<ul>
|
||||||
|
<li>hledger</li>
|
||||||
|
<li>hledger-ui</li>
|
||||||
|
<li>hledger-web</li>
|
||||||
|
<li>hledger-iadd</li>
|
||||||
|
<li>hledger-interest</li>
|
||||||
|
<li>etc.</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="file-formats" class="slide section level2">
|
||||||
|
<h1>File formats</h1>
|
||||||
|
<ul>
|
||||||
|
<li>journal</li>
|
||||||
|
<li>csv</li>
|
||||||
|
<li>timeclock</li>
|
||||||
|
<li>timedot</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="documentation" class="slide section level2">
|
||||||
|
<h1>Documentation</h1>
|
||||||
|
<ul>
|
||||||
|
<li>introductory</li>
|
||||||
|
<li>reference</li>
|
||||||
|
<li>cookbook</li>
|
||||||
|
<li>developer</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<div id="architecture" class="title-slide slide section level1">
|
||||||
|
<h1>Architecture</h1>
|
||||||
|
<p><code>0:10 (25m)</code></p>
|
||||||
|
</div>
|
||||||
|
<div id="hledger-project-goals" class="slide section level2">
|
||||||
|
<h1>hledger project goals</h1>
|
||||||
|
<p>I was a Ledger user and new Haskeller. I started hledger with many goals:</p>
|
||||||
|
<ul>
|
||||||
|
<li>acquire a more robust, usable, evolving incarnation of Ledger</li>
|
||||||
|
<li>develop a consistent, effective accounting habit</li>
|
||||||
|
<li>get better at Haskell</li>
|
||||||
|
<li>find out if Haskell was good for end-user apps and maintainer productivity</li>
|
||||||
|
<li>grow a useful, long-lasting, financially sustainable FOSS accounting project</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="a-fast-run-through-the-evolution" class="slide section level2">
|
||||||
|
<h1>A fast run through the evolution</h1>
|
||||||
|
<ul>
|
||||||
|
<li>First commit</li>
|
||||||
|
<li>First types</li>
|
||||||
|
<li>First report</li>
|
||||||
|
<li>Balance report</li>
|
||||||
|
<li>Multi-column balance report</li>
|
||||||
|
<li>Stateful parser</li>
|
||||||
|
<li>Web interface</li>
|
||||||
|
<li>Curses interface</li>
|
||||||
|
<li>Package split</li>
|
||||||
|
<li>Speed, features</li>
|
||||||
|
<li>General currency conversion</li>
|
||||||
|
<li>Valuation</li>
|
||||||
|
<li>Always documentation</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div id="a-tour-of-the-codebase-and-project-today-2021q2" class="slide section level2">
|
||||||
|
<h1>A tour of the codebase and project today (2021Q2)</h1>
|
||||||
|
</div>
|
||||||
|
<div id="design-principles" class="slide section level2">
|
||||||
|
<h1>Design principles</h1>
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<div id="how-to.." class="title-slide slide section level1">
|
||||||
|
<h1>How to..</h1>
|
||||||
|
<p><code>0:35 (25m)</code></p>
|
||||||
|
</div>
|
||||||
|
<div id="script-hledger" class="slide section level2">
|
||||||
|
<h1>Script hledger</h1>
|
||||||
|
</div>
|
||||||
|
<div id="integrate-hledger-in-your-app" class="slide section level2">
|
||||||
|
<h1>Integrate hledger in your app</h1>
|
||||||
|
<h3 id="run-cli-capture-csvjson">Run cli, capture csv/json</h3>
|
||||||
|
<h3 id="run-hledger-web-use-http-json-api">Run hledger-web, use http-json api</h3>
|
||||||
|
<h3 id="link-with-hledger-lib-andor-other-hledger-packages-call-public-functions">Link with hledger-lib and/or other hledger packages, call public functions</h3>
|
||||||
|
</div>
|
||||||
|
<div id="investigate-a-hledger-bug" class="slide section level2">
|
||||||
|
<h1>Investigate a hledger bug</h1>
|
||||||
|
<h3 id="basic-troubleshooting---docs-comparison-minimisation-reproduction-support">Basic troubleshooting - docs, comparison, minimisation, reproduction, support</h3>
|
||||||
|
<h3 id="code-debugging">Code debugging</h3>
|
||||||
|
</div>
|
||||||
|
<div id="how-to-submit-a-pull-request" class="slide section level2">
|
||||||
|
<h1>How to submit a pull request</h1>
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<div id="q-a" class="title-slide slide section level1">
|
||||||
|
<h1>Q & A</h1>
|
||||||
|
<p><code>1:00 (30m)</code></p>
|
||||||
|
</div>
|
||||||
|
|
||||||
|
<div id="end" class="title-slide slide section level1">
|
||||||
|
<h1>End</h1>
|
||||||
|
<p><code>1:30</code></p>
|
||||||
|
<pre><code>$ git shortlog -s
|
||||||
|
Aerex
|
||||||
|
Aiken Cairncross
|
||||||
|
Alejandro García Montoro
|
||||||
|
Aleksandar Dimitrov
|
||||||
|
Alex Chen
|
||||||
|
Alvaro Fernando García
|
||||||
|
Amarandus
|
||||||
|
Amitai Burstein
|
||||||
|
Andreas Pauley
|
||||||
|
Andrew Jones
|
||||||
|
Andriy Mykhaylyk
|
||||||
|
Arnout Engelen
|
||||||
|
Ben Boeckel
|
||||||
|
Ben Creasy
|
||||||
|
Boyd Kelly
|
||||||
|
Brian Scott
|
||||||
|
Brian Wignall
|
||||||
|
Bryan Richter
|
||||||
|
Caleb Maclennan
|
||||||
|
Carel Fellinger
|
||||||
|
Carl Richard Theodor Schneider
|
||||||
|
Carlos Lopez-Camey
|
||||||
|
Christian G. Warden
|
||||||
|
Christoph Nicolai
|
||||||
|
Clint Adams
|
||||||
|
Colin Woodbury
|
||||||
|
Damien Cassou
|
||||||
|
David Reaver
|
||||||
|
David Zhang
|
||||||
|
Dmitry Astapov
|
||||||
|
Dominik Süß
|
||||||
|
Doug Goldstein
|
||||||
|
Eli Flanagan
|
||||||
|
Elijah Caine
|
||||||
|
Eric Kow
|
||||||
|
Eric Mertens
|
||||||
|
Everett Hildenbrandt
|
||||||
|
Evilham
|
||||||
|
Felix Van der Jeugt
|
||||||
|
Felix Yan
|
||||||
|
Fun Ilrys (Nissar Chababy)
|
||||||
|
Gabriel Ebner
|
||||||
|
Gaith Hallak
|
||||||
|
Gergely Risko
|
||||||
|
Hans-Peter Deifel
|
||||||
|
Henning Thielemann
|
||||||
|
Imuli
|
||||||
|
Jacek Generowicz
|
||||||
|
Jacob Weisz
|
||||||
|
Jakob Schöttl
|
||||||
|
Jakub Zárybnický
|
||||||
|
Jan Zerebecki
|
||||||
|
Jeff Richards
|
||||||
|
Jesse Rosenthal
|
||||||
|
Joachim Breitner
|
||||||
|
Joe Horsnell
|
||||||
|
Johann Klähn
|
||||||
|
Johannes Gerer
|
||||||
|
John Wiegley
|
||||||
|
Joseph Weston
|
||||||
|
Joshua Chia
|
||||||
|
Joshua Kehn
|
||||||
|
Judah Jacobson
|
||||||
|
Julien Moutinho
|
||||||
|
Justin Le
|
||||||
|
Kyle Marek-Spartz
|
||||||
|
Luca Molteni
|
||||||
|
Léo Gaspard
|
||||||
|
M Parker
|
||||||
|
Malte Brandy
|
||||||
|
Mark Hansen
|
||||||
|
Marko Kocić
|
||||||
|
Martin Michlmayr
|
||||||
|
Mateus Furquim
|
||||||
|
Matthias Kauer
|
||||||
|
Max Bolingbroke
|
||||||
|
Michael Kainer
|
||||||
|
Michael Sanders
|
||||||
|
Michael Snoyman
|
||||||
|
Michael Walker
|
||||||
|
Mick Dekkers
|
||||||
|
Mitchell Rosen
|
||||||
|
Moritz Kiefer
|
||||||
|
Mykola Orliuk
|
||||||
|
Nadrieril
|
||||||
|
Nicholas Niro
|
||||||
|
Nick Ingolia
|
||||||
|
Nicolas Wavrant
|
||||||
|
Nikhil Jha
|
||||||
|
Nissar Chababy
|
||||||
|
Nolan Darilek
|
||||||
|
Oliver Braun
|
||||||
|
Omari Norman
|
||||||
|
Pavan Rikhi
|
||||||
|
Pavlo Kerestey
|
||||||
|
Peter Simons
|
||||||
|
Pia Mancini
|
||||||
|
Rick Lupton
|
||||||
|
Roman Cheplyaka
|
||||||
|
Rui Chen
|
||||||
|
Ryan Desfosses
|
||||||
|
Sam Doshi
|
||||||
|
Sam Jeeves
|
||||||
|
Samuel May
|
||||||
|
Sergei Trofimovich
|
||||||
|
Sergey Astanin
|
||||||
|
Shubham Lagwankar
|
||||||
|
Simon Hengel
|
||||||
|
Simon Michael
|
||||||
|
SpicyCat
|
||||||
|
Stefano Rodighiero
|
||||||
|
Stephen Morgan
|
||||||
|
Steven R. Baker
|
||||||
|
TANIGUCHI Kohei
|
||||||
|
Thomas R. Koll
|
||||||
|
Tim Docker
|
||||||
|
Timofey ZAKREVSKIY
|
||||||
|
Trygve Laugstøl
|
||||||
|
Vladimir Sorokin
|
||||||
|
Vladimir Zhelezov
|
||||||
|
Wad
|
||||||
|
Xinruo Sun
|
||||||
|
afarrow
|
||||||
|
agander
|
||||||
|
aragaer
|
||||||
|
awjchen
|
||||||
|
azure-pipelines[bot]
|
||||||
|
flip111
|
||||||
|
gwern
|
||||||
|
jeevcat
|
||||||
|
jungle-boogie
|
||||||
|
legrostdg
|
||||||
|
trevorriles
|
||||||
|
zieone</code></pre>
|
||||||
|
<!--
|
||||||
|
https://pandoc.org/MANUAL.html#slide-shows
|
||||||
|
|
||||||
|
By default, the slide level is the highest heading level in the
|
||||||
|
hierarchy that is followed immediately by content, and not another
|
||||||
|
heading, somewhere in the document. In the example above, level-1
|
||||||
|
headings are always followed by level-2 headings, which are followed
|
||||||
|
by content, so the slide level is 2. This default can be overridden
|
||||||
|
using the --slide-level option.
|
||||||
|
|
||||||
|
The document is carved up into slides according to the following rules:
|
||||||
|
A horizontal rule always starts a new slide.
|
||||||
|
A heading at the slide level always starts a new slide.
|
||||||
|
Headings below the slide level in the hierarchy create headings within a slide.
|
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Headings above the slide level in the hierarchy create “title slides,” which just contain the section title and help to break the slide show into sections. Non-slide content under these headings will be included on the title slide (for HTML slide shows) or in a subsequent slide with the same title (for beamer).
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-->
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</div>
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|
</body>
|
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|
</html>
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Loading…
Reference in New Issue
Block a user