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;doc: journal: clarify commodity directive does not affect parsing

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Simon Michael 2019-05-25 05:29:49 -07:00
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hledger-lib/hledger_journal.m4.md
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@ -793,7 +793,9 @@ Y2010 ; change default year to 2010
### Declaring commodities
The `commodity` directive declares commodities which may be used in the journal (though currently we do not enforce this).
The `commodity` directive declares commodities which may be used in the journal,
and their display format.
It may be written on a single line, like this:
```journal
@ -819,12 +821,18 @@ commodity INR
format INR 9,99,99,999.00
```
Commodity directives have a second purpose: they define the standard display format for amounts in the commodity.
Declaring commodites may be useful as documentation,
but currently we do not enforce that only declared commodities may be used.
This directive is mainly useful for customising the preferred display format for a commodity.
Normally the display format is inferred from journal entries, but this can be unpredictable;
declaring it with a commodity directive overrides this and removes ambiguity.
Towards this end, amounts in commodity directives must always be written with a decimal point
(a period or comma, followed by 0 or more decimal digits).
Commodity directives do not affect how amounts are parsed;
the parser will read multiple formats.
### Default commodity
The `D` directive sets a default commodity (and display format), to be used for amounts without a commodity symbol (ie, plain numbers).