doc: dev guide: put how-tos first, copy diagram from old wiki
This commit is contained in:
Simon Michael
parent
4ed6ce3442
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6fb0910996
@ -145,152 +145,7 @@ Here's the original [proposal](http://article.gmane.org/gmane.comp.finance.ledge
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<!-- ### contributors and credits -->
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---
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## Implementation notes
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### hledger
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There are two core cabal packages:
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**[hledger-lib](http://hackage.haskell.org/package/hledger-lib)** - data model, parsing, manipulation, standard reports
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([github](https://github.com/simonmichael/hledger/tree/master/hledger-lib))\
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**[hledger](http://hackage.haskell.org/package/hledger)** - command line interface, reusable cli options & helpers
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([github](https://github.com/simonmichael/hledger/tree/master/hledger))
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Most data types are defined in hledger-lib:Hledger.Data.Types,
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while functions that operate on them are defined in
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hledger-lib:Hledger.Data.TYPENAME.
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Here's a diagram of the main data model:
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<uml>
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hide empty members
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hide circle
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skinparam packageStyle Rect
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Ledger *-- Journal
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Ledger *-- "*" Account
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note top of Ledger: A Journal and all its accounts with their balances.\nUsed for balance report
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note top of Journal: A journal file and parsed transactions & directives.\nUsed for print & register reports
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note bottom of Account: An account's name, balance (inclusive &\nexclusive), parent and child accounts
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Account o-- "*" Account :subaccounts, parent
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Journal o-- File
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File o-- "*" File :include
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Journal *-- "*" HistoricalPrice
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Journal *-- "*" Transaction
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HistoricalPrice -- Date
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HistoricalPrice -- Amount
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Transaction -- Date
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Transaction *-- "*" Posting
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Transaction o-- "*" Tag
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Posting o- "*" Tag
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Posting -- "0..1" Date
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Account -- AccountName
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Posting -- AccountName
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Account -- "2" MixedAmount
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Posting -- MixedAmount
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MixedAmount *-- "*" Amount
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Amount -- Commodity
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Amount -- Quantity
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Amount -- Price
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Amount -- AmountStyle
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</uml>
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hledger parses the journal file into a
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[Journal](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Journal),
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which contains a list of
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[Transactions](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Transaction),
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each containing multiple
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[Postings](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Posting)
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of some
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[MixedAmount](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:MixedAmount)
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(multiple
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single-[Commodity](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Commodity)
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[Amounts](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Amount))
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to some
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[AccountName](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:AccountName).
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Commands get and render
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[Reports](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Reports.html)
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from the Journal, or sometimes from a
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[Ledger](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Ledger),
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which contains
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[Accounts](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Account)
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representing the summed balances and other details of each account.
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After surveying the packages, modules, and data types, try tracing the execution of a hledger command:
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1. CLI stuff is in [hledger:Hledger.Cli](https://github.com/simonmichael/hledger/tree/master/hledger/Hledger/Cli).
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2. [hledger:Hledger.Cli.Main:main](https://github.com/simonmichael/hledger/blob/master/hledger/Hledger/Cli/Main.hs#L179)
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parses the command line to select a command, then
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3. gives it to
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[hledger:Hledger.Cli.Utils:withJournalDo](https://github.com/simonmichael/hledger/blob/master/hledger/Hledger/Cli/Utils.hs#L61),
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which runs it after doing all the initial parsing.
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4. Parsing code is under
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[hledger-lib:Hledger.Read](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Read.hs),
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eg the
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[hledger-lib:Hledger.Read.JournalReader](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Read/JournalReader.hs).
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5. Commands extract useful information from the parsed data model using
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[hledger-lib:Hledger.Reports](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Reports),
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and
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6. render it to the console.
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7. Everything uses the types and data
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utilities under
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[hledger-lib:Hledger.Data](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Data),
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and the general helpers from
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[hledger-lib:Hledger.Utils](https://github.com/simonmichael/hledger/blob/master/hledger-lib/Hledger/Utils.hs)
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and below.
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### hledger-web
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hledger-web is in a third cabal package:
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**[hledger-web](http://hackage.haskell.org/package/hledger-web)** - web interface
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([github](https://github.com/simonmichael/hledger/tree/master/hledger-web))
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It is a single-executable web application using the
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[yesod](http://yesodweb.com) framework. It runs a built-in web server
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serving some views of the journal file, reading it at startup and
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again whenever it changes. It can also append new transactions to the journal file.
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There are two main views, which can be filtered with [query arguments](manual#query-arguments):
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- [/journal](http://demo.hledger.org/journal), showing general journal entries (like `hledger print`)
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- [/register](http://demo.hledger.org/register?q=inacct:Assets:Bank:Checking),
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showing transactions affecting an account (slightly different from
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`hledger register`, which shows postings).
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There is also:
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- a sidebar (toggled by pressing `s`) showing the chart of accounts (like `hledger balance`)
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- an [add form](http://demo.hledger.org/journal?add=1) for adding new transactions (press `a`)
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- a help dialog showing quick help and keybindings (press `h` or click ?)
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Most of the action is in
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- [config/routes](https://github.com/simonmichael/hledger/tree/master/hledger-web/config/routes)
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- [templates/default-layout-wrapper.hamlet](https://github.com/simonmichael/hledger/tree/master/hledger-web/templates/default-layout-wrapper.hamlet)
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- [Foundation](https://github.com/simonmichael/hledger/tree/master/hledger-web/Foundation.hs)
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- [Handler.*](https://github.com/simonmichael/hledger/tree/master/hledger-web/Handler)
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- [static/hledger.js](https://github.com/simonmichael/hledger/tree/master/hledger-web/static/hledger.js)
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- [static/hledger.css](https://github.com/simonmichael/hledger/tree/master/hledger-web/static/hledger.css)
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Handler module and function names end with R, like the Yesod-generated route type they deal with.
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Dynamically generated page content is mostly inline hamlet.
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Lucius/Julius files and widgets generally are not used, except for the default layout.
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The quickest way to test changes is `make ghciweb`, `:main --serve`, control-C, `:r`, repeat.
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No linking is required, and changes to static files like hledger.js are visible after reloading a page.
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Another way is `yesod devel`, which rebuilds automatically when files
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change, including config files, templates and static files (but only in the hledger-web package).
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A third way is `make autoweb`, if you can get it working (see the
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makefile for instructions). This rebuilds automatically when haskell
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files change in any of the hledger{-lib,,-web} packages.
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---
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## How to..
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@ -560,3 +415,150 @@ don't run make setversion. Use make -n if unsure.
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11. announce
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- [email hledger]
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- [tweet]
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## Implementation notes
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### hledger
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There are two core cabal packages:
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**[hledger-lib](http://hackage.haskell.org/package/hledger-lib)** - data model, parsing, manipulation, standard reports
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([github](https://github.com/simonmichael/hledger/tree/master/hledger-lib))\
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**[hledger](http://hackage.haskell.org/package/hledger)** - command line interface, reusable cli options & helpers
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([github](https://github.com/simonmichael/hledger/tree/master/hledger))
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Most data types are defined in hledger-lib:Hledger.Data.Types,
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while functions that operate on them are defined in
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hledger-lib:Hledger.Data.TYPENAME.
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Here's a diagram of the main data model:
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<img src="images/data-model.png">
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<!--
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generated by the old wiki from:
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<uml>
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hide empty members
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hide circle
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skinparam packageStyle Rect
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Ledger *-- Journal
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Ledger *-- "*" Account
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note top of Ledger: A Journal and all its accounts with their balances.\nUsed for balance report
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note top of Journal: A journal file and parsed transactions & directives.\nUsed for print & register reports
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note bottom of Account: An account's name, balance (inclusive &\nexclusive), parent and child accounts
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Account o-- "*" Account :subaccounts, parent
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Journal o-- File
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File o-- "*" File :include
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Journal *-- "*" HistoricalPrice
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Journal *-- "*" Transaction
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HistoricalPrice -- Date
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HistoricalPrice -- Amount
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Transaction -- Date
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Transaction *-- "*" Posting
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Transaction o-- "*" Tag
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Posting o- "*" Tag
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Posting -- "0..1" Date
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Account -- AccountName
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Posting -- AccountName
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Account -- "2" MixedAmount
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Posting -- MixedAmount
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MixedAmount *-- "*" Amount
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Amount -- Commodity
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Amount -- Quantity
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Amount -- Price
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Amount -- AmountStyle
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</uml>
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-->
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hledger parses the journal file into a
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[Journal](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Journal),
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which contains a list of
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[Transactions](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Transaction),
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each containing multiple
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[Postings](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Posting)
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of some
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[MixedAmount](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:MixedAmount)
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(multiple
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single-[Commodity](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Commodity)
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[Amounts](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Amount))
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to some
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[AccountName](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:AccountName).
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Commands get and render
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[Reports](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Reports.html)
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from the Journal, or sometimes from a
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[Ledger](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Ledger),
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which contains
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[Accounts](http://hackage.haskell.org/package/hledger-lib-0.23.2/docs/Hledger-Data-Types.html#t:Account)
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representing the summed balances and other details of each account.
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After surveying the packages, modules, and data types, try tracing the execution of a hledger command:
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1. CLI stuff is in [hledger:Hledger.Cli](https://github.com/simonmichael/hledger/tree/master/hledger/Hledger/Cli).
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2. [hledger:Hledger.Cli.Main:main](https://github.com/simonmichael/hledger/blob/master/hledger/Hledger/Cli/Main.hs#L179)
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parses the command line to select a command, then
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3. gives it to
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[hledger:Hledger.Cli.Utils:withJournalDo](https://github.com/simonmichael/hledger/blob/master/hledger/Hledger/Cli/Utils.hs#L61),
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which runs it after doing all the initial parsing.
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4. Parsing code is under
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[hledger-lib:Hledger.Read](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Read.hs),
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eg the
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[hledger-lib:Hledger.Read.JournalReader](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Read/JournalReader.hs).
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5. Commands extract useful information from the parsed data model using
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[hledger-lib:Hledger.Reports](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Reports),
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and
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6. render it to the console.
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7. Everything uses the types and data
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utilities under
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[hledger-lib:Hledger.Data](https://github.com/simonmichael/hledger/tree/master/hledger-lib/Hledger/Data),
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and the general helpers from
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[hledger-lib:Hledger.Utils](https://github.com/simonmichael/hledger/blob/master/hledger-lib/Hledger/Utils.hs)
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and below.
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### hledger-web
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hledger-web is in a third cabal package:
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**[hledger-web](http://hackage.haskell.org/package/hledger-web)** - web interface
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([github](https://github.com/simonmichael/hledger/tree/master/hledger-web))
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It is a single-executable web application using the
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[yesod](http://yesodweb.com) framework. It runs a built-in web server
|
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serving some views of the journal file, reading it at startup and
|
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again whenever it changes. It can also append new transactions to the journal file.
|
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There are two main views, which can be filtered with [query arguments](manual#query-arguments):
|
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|
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- [/journal](http://demo.hledger.org/journal), showing general journal entries (like `hledger print`)
|
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- [/register](http://demo.hledger.org/register?q=inacct:Assets:Bank:Checking),
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showing transactions affecting an account (slightly different from
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`hledger register`, which shows postings).
|
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|
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There is also:
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- a sidebar (toggled by pressing `s`) showing the chart of accounts (like `hledger balance`)
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- an [add form](http://demo.hledger.org/journal?add=1) for adding new transactions (press `a`)
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- a help dialog showing quick help and keybindings (press `h` or click ?)
|
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Most of the action is in
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- [config/routes](https://github.com/simonmichael/hledger/tree/master/hledger-web/config/routes)
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- [templates/default-layout-wrapper.hamlet](https://github.com/simonmichael/hledger/tree/master/hledger-web/templates/default-layout-wrapper.hamlet)
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- [Foundation](https://github.com/simonmichael/hledger/tree/master/hledger-web/Foundation.hs)
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- [Handler.*](https://github.com/simonmichael/hledger/tree/master/hledger-web/Handler)
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- [static/hledger.js](https://github.com/simonmichael/hledger/tree/master/hledger-web/static/hledger.js)
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- [static/hledger.css](https://github.com/simonmichael/hledger/tree/master/hledger-web/static/hledger.css)
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Handler module and function names end with R, like the Yesod-generated route type they deal with.
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|
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Dynamically generated page content is mostly inline hamlet.
|
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Lucius/Julius files and widgets generally are not used, except for the default layout.
|
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|
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The quickest way to test changes is `make ghciweb`, `:main --serve`, control-C, `:r`, repeat.
|
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No linking is required, and changes to static files like hledger.js are visible after reloading a page.
|
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|
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Another way is `yesod devel`, which rebuilds automatically when files
|
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change, including config files, templates and static files (but only in the hledger-web package).
|
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|
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A third way is `make autoweb`, if you can get it working (see the
|
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makefile for instructions). This rebuilds automatically when haskell
|
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files change in any of the hledger{-lib,,-web} packages.
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|
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BIN
doc/site/images/data-model.png
Normal file
BIN
doc/site/images/data-model.png
Normal file
Binary file not shown.
|
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