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;doc:csv:if table: clarify, explain why backslash won't work (#2107)

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Simon Michael 2023-11-21 12:01:28 -10:00
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hledger/hledger.m4.md
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@ -3355,15 +3355,18 @@ MATCHERC,VALUE1,VALUE2,...
<empty line>
```
The first character after `if` is taken to be the separator for the rest of the table.
It should be a non-alphanumeric character like `,` or `|` that does not appear anywhere else in the table.
(Note: it is unrelated to the CSV file's separator.)
Whitespace can be used in the matcher lines for readability, but not in the if line currently.
The table must be terminated by an empty line (or end of file).
Each line must contain the same number of separators; empty values are allowed.
The first character after `if` is taken to be this if table's field separator.
It is unrelated to the separator used in the CSV file.
It should be a non-alphanumeric character like `,` or `|` that does not appear anywhere else in the table
(it should not be used in field names or matchers or values, and it cannot be escaped with a backslash).
The above means: try all of the matchers; whenever a matcher succeeds,
assign all of the values on that line to the corresponding hledger fields;
Each line must contain the same number of separators; empty values are allowed.
Whitespace can be used in the matcher lines for readability (but not in the if line, currently).
The table must be terminated by an empty line (or end of file).
An if table like the above is interpreted as follows:
try all of the matchers;
whenever a matcher succeeds, assign all of the values on that line to the corresponding hledger fields;
later lines can overrider earlier ones.
It is equivalent to this sequence of if blocks: