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doc: update addons intro

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hledger/doc/addons.m4.md
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# ADD-ON COMMANDS # ADD-ON COMMANDS
Add-on commands are executables in your PATH whose name starts with hledger also searches for external add-on commands, and will include these in the commands list.
`hledger-` and ends with any of these file extensions: These are programs or scripts in your PATH whose name starts with `hledger-`
none, `.hs`,`.lhs`,`.pl`,`.py`,`.rb`,`.rkt`,`.sh`,`.bat`,`.com`,`.exe`. and ends with a recognised file extension
Also, an add-on's name may not be the same as any built-in command or alias. (currently: no extension, `bat`,`com`,`exe`, `hs`,`lhs`,`pl`,`py`,`rb`,`rkt`,`sh`).
hledger will detect these and include them in the command list and let Add-ons can be invoked like any hledger command, but there are a few things to be aware of.
you invoke them with `hledger ADDONCMD`. However there are some limitations: Eg if the `hledger-web` add-on is installed,
- Options appearing before ADDONCMD will be visible only to hledger and will not be passed to the add-on. - `hledger -h web` shows hledger's help, while `hledger web -h` shows hledger-web's help.
Eg: `hledger -h web` shows hledger's usage, `hledger web -h` shows hledger-web's usage.
- Options understood only by the add-on must go after a `--` argument to hide them from hledger, which would otherwise reject them.
Eg: `hledger web -- --server`.
Sometimes it may be more convenient to just run the add-on directly, eg: `hledger-web --server`. - Flags specific to the add-on must have a preceding `--` to hide them from hledger.
So `hledger web --serve --port 9000` will be rejected; you must use `hledger web -- --serve --port 9000`.
Add-ons which are written in haskell can take advantage of the hledger-lib library - You can always run add-ons directly if preferred: `hledger-web --serve --port 9000`.
for journal parsing, reporting, command-line options, etc.
Here are some hledger add-ons available from Hackage, Add-ons are a relatively easy way to add local features or experiment with new ideas.
the [extra](https://github.com/simonmichael/hledger/tree/master/extra) directory in the hledger source, They can be written in any language, but haskell scripts have a big advantage:
or elsewhere: they can use the same hledger (and haskell) library functions that built-in commands do,
for command-line options, journal parsing, reporting, etc.
Here are some hledger add-ons available:
## Official add-ons ## Official add-ons
@ -37,7 +37,7 @@ Web interface, see [hledger-web](hledger-web.html).
## Third party add-ons ## Third party add-ons
These are maintained separately from hledger, and usually updated shortly after a hledger release. These are maintained separately, and usually updated shortly after a hledger release.
### diff ### diff
@ -60,11 +60,10 @@ Calculates the internal rate of return of an investment account.
## Experimental add-ons ## Experimental add-ons
These add-ons are available in source form These are available in source form in the hledger repo's bin/ directory;
[in the hledger repo](https://github.com/simonmichael/hledger/tree/master/bin). installing them is [pretty easy](/download.html#d).
Installing them is [pretty easy](/download.html#d). They may be less mature and documented than built-in commands.
Reading and copying these is a good way to start making your own add-ons. Reading and tweaking these is a good way to start making your own!
These may be less mature and documented than built-in commands.
### autosync ### autosync