hledger/hledger-lib/hledger_journal_directives.m4.md

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### Summary of directives
hledger's directives are based on Ledger's, but there are many differences (and also some between hledger versions).
Directives' behaviour and interactions can get a little bit [complex](https://github.com/simonmichael/hledger/issues/793),
especially with multiple files,
so here is a table summarising them and their effects.
| directive | end directive | subdirectives | purpose | can affect (as of 2018/06)
|:------------------|:--------------------|:----------------|:-------------------------------------------------------------------|:---------------------------------------------
| [`account`] | | any text | declare an account name & optional account code | account code: balance reports (except `balance` single-column mode) <!-- all entries in all files -->
| [`alias`] | `end aliases` | | rewrite account names | following inline/included entries until end of current file or end directive
| [`apply account`] | `end apply account` | | prepend a common parent to account names | following inline/included entries until end of current file or end directive
| [`comment`] | `end comment` | | ignore part of journal | following inline/included entries until end of current file or end directive
| [`commodity`] | | `format` | declare a commodity and its number notation & display style | number notation: following entries in that commodity in all files; <br>display style: amounts of that commodity in reports
| [`D`] | | | declare a commodity, number notation & display style for commodityless amounts | commodity: all commodityless entries in all files; <br>number notation: following commodityless entries and entries in that commodity in all files; <br>display style: amounts of that commodity in reports
| [`include`] | | | include entries/directives from another file | what the included directives affect
| [`P`] | | | declare a market price for a commodity | amounts of that commodity in reports, when -V is used
| [`Y`] | | | declare a year for yearless dates | following inline/included entries until end of current file
[`account`]: http://hledger.org/journal.html#declaring-accounts
[`alias`]: http://hledger.org/journal.html#rewriting-accounts
[`apply account`]: http://hledger.org/journal.html#default-parent-account
[`comment`]: http://hledger.org/journal.html#comment-blocks
[`commodity`]: http://hledger.org/journal.html#declaring-commodities
[`D`]: http://hledger.org/journal.html#default-commodity
[`include`]: http://hledger.org/journal.html#including-other-files
[`P`]: http://hledger.org/journal.html#market-prices
[`Y`]: http://hledger.org/journal.html#default-year
#### Definitions:
|||
|:----------------|:--------------------------------------------------------------------------------------------------------------------
| subdirective | optional indented directive or unparsed text lines immediately following a parent directive
| account code | numeric code influencing account display order in most balance reports
| number notation | how to interpret numbers when parsing journal entries (the identity of the decimal separator character). Currently each commodity can have its own notation, even in the same file.
| display style | how to display amounts of a commodity in reports (symbol side and spacing, digit groups, decimal separator, decimal places)
| directive scope | which entries and (when there are multiple files) which files are affected by a directive
<!-- | **entries affected:** | -->
<!-- | following | subsequent entries in the file/parse stream -->
<!-- | delimited | subsequent entries, until an optional end directive -->
<!-- | all | all preceding and following entries -->
<!-- | **files affected:** | -->
<!-- | current | affects current file only -->
<!-- | children | affects current file and files included by it -->
<!-- | siblings | affects current file, included files, and other same-level files, but not higher-level files -->
<!-- | all | affects all files -->