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;doc: update output dest/format docs; add notes about JSON

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Simon Michael 2020-02-25 09:25:20 -08:00
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hledger-web/hledger-web.m4.md
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@ -221,8 +221,8 @@ As with the web UI's add form, hledger-web must be started with the `add` capabi
The payload should be a valid hledger transaction as JSON, similar to what you get from `/transactions` or `/accounttransactions`.
Another way to generate test data is with the `readJsonFile`/`writeJsonFile` helpers in Hledger.Web.Json,
which read or write any of hledger's [JSON-capable types](https://github.com/simonmichael/hledger/blob/master/hledger-web/Hledger/Web/Json.hs#L45)
from or to a file.
which can write or read most of hledger's [data types](https://github.com/simonmichael/hledger/blob/master/hledger-lib/Hledger/Data/Types.hs)
to or from a file.
Eg here we write the first transaction of a sample journal:
```shell
$ make ghci-web

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hledger/hledger.m4.md
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@ -756,25 +756,56 @@ or concatenate the files, eg: `cat a.journal b.journal | hledger -f- CMD`.
## Output destination
Some commands (print, register, stats, the balance commands)
can write their output to a destination other than the console.
This is controlled by the `-o/--output-file` option.
hledger commands send their output to the terminal by default.
You can of course redirect this, eg into a file, using standard shell syntax:
```shell
$ hledger balance -o - # write to stdout (the default)
$ hledger balance -o FILE # write to FILE
$ hledger print > foo.txt
```
Some commands (print, register, stats, the balance commands) also
provide the `-o/--output-file` option, which does the same thing
without needing the shell. Eg:
```shell
$ hledger print -o foo.txt
$ hledger print -o - # write to stdout (the default)
```
## Output format
Some commands can write their output in other formats.
Eg print and register can output CSV, and the balance commands can output CSV or HTML.
This is controlled by the `-O/--output-format` option, or by specifying a `.csv` or `.html` file extension with `-o/--output-file`.
Some commands (print, register, the balance commands) offer a choice of output format.
In addition to the usual plain text format (`txt`), there are
CSV (`csv`), HTML (`html`) and JSON (`json`).
This is controlled by the `-O/--output-format` option:
```shell
$ hledger balance -O csv # write CSV to stdout
$ hledger balance -o FILE.csv # write CSV to FILE.csv
$ hledger print -O csv
```
or, by a file extension specified with `-o/--output-file`:
```shell
$ hledger balancesheet -o foo.html # write HTML to foo.html
```
The `-O` option can be used to override the file extension if needed:
```shell
$ hledger balancesheet -o foo.txt -O html # write HTML to foo.txt
```
Some notes about JSON output:
- This feature is marked experimental, and not yet much used; you
should expect our JSON to evolve. Real-world feedback is welcome.
- Our JSON is rather large and verbose, as it is quite a faithful
representation of hledger's internal data types. To understand the
JSON, read the Haskell type definitions, which are mostly in
https://github.com/simonmichael/hledger/blob/master/hledger-lib/Hledger/Data/Types.hs.
- The JSON output from hledger commands is essentially the same as the
JSON served by [hledger-web's JSON API](hledger-web.html#json-api),
but pretty printed, using line breaks and indentation.
- Our pretty printer has the ability to elide data in certain cases -
rendering non-strings as if they were strings, or displaying "FOO.."
instead of FOO's full details. This should never happen in hledger's
JSON output; if you see otherwise, please report as a bug.
## Regular expressions