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;doc: cli: document which commands support which output formats

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@ -1417,26 +1417,73 @@ This is controlled by the `--pretty` option:
## Output format
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`), JSON (`json`) and SQL (`sql`).
This is controlled by the `-O/--output-format` option:
Some commands offer additional output formats, other than the usual plain text terminal output.
Here are those commands and the formats currently supported:
| | txt | csv | json | html | sql |
|--------------------------|-----|-----|------|---------|-----|
| aregister | Y | Y | Y | | |
| balance *[1]* | Y | Y | Y | Y *[2]* | |
| balancesheet *[1]* | Y | Y | Y | Y | |
| balancesheetequity *[1]* | Y | Y | Y | Y | |
| cashflow *[1]* | Y | Y | Y | Y | |
| incomestatement *[1]* | Y | Y | Y | Y | |
| print | Y | Y | Y | | Y |
| register | Y | Y | Y | | |
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- *[1] Balance commands also have a multi-commodity [`--layout` option](#commodity-layout) which affects some output formats.*
- *[2] Except with no report interval, or with the `--budget` flag.*
The output format is selected by the `-O/--output-format=FMT` option:
```shell
$ 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
$ hledger print -O csv # print CSV on stdout
```
Some notes about JSON output:
or by the filename extension of an output file specified with the `-o/--output-file=FILE.FMT` option:
```shell
$ hledger balancesheet -o foo.csv # write CSV to foo.csv
```
- This feature is marked experimental, and not yet much used; you
should expect our JSON to evolve. Real-world feedback is welcome.
The `-O` option can be combined with `-o` to override the file extension, if needed:
```shell
$ hledger balancesheet -o foo.txt -O csv # write CSV to foo.txt
```
### HTML output
- HTML output can be styled by an optional `hledger.css` file in the same directory.
### JSON output
- Not yet much used; 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
@ -1464,10 +1511,9 @@ Some notes about JSON output:
find otherwise, please let us know.
(Cf [#1195](https://github.com/simonmichael/hledger/issues/1195))
Notes about SQL output:
### SQL output
- SQL output is also marked experimental, and much like JSON could use
real-world feedback.
- Not yet much used; real-world feedback is welcome.
- SQL output is expected to work with sqlite, MySQL and PostgreSQL
@ -1477,6 +1523,8 @@ real-world feedback.
of existing data (via `delete` or `truncate` SQL statements) or drop
tables completely as otherwise your postings will be duped.
## Commodity styles
The display style of a commodity/currency is inferred according to the rules