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Shell: Add some sections on the manpage about `match'

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AnotherTest 2020-09-14 23:14:09 +04:30 committed by Andreas Kling
parent 4f223793c0
commit 3a8109d1e0
Notes: sideshowbarker 2024-07-19 02:37:59 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/3a8109d1e02
Pull-request: https://github.com/SerenityOS/serenity/pull/3490
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Base/usr/share/man/man5/Shell.md
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@ -60,6 +60,8 @@ The following tokens:
* `in` as a syntactic element of a `for` expression
* `if` in command name position, or after the `else` keyword
* `else` after a partial `if` expression
* `match` in command name position
* `as` as part of a `match` expression
##### Special characters
Any of the following:
@ -251,6 +253,28 @@ $ fn 1 2 3 4
# 1 2 3 ( 1 2 3 4 )
```
##### Match Expressions
The pattern matching construct `match` shall choose from a sequence of patterns, and execute the corresponding action in a new frame.
The choice is done by matching the result of the _matched expression_ (after expansion) against the _patterns_ (expanded down to either globs or literals).
Multiple _patterns_ can be attributed to a single given action by delimiting them with a pipe ('|') symbol.
The expanded _matched expression_ can optionally be given a name using the `as name` clause after the _matched expression_, with which it may be accessible in the action clauses.
######
```sh
# Match the result of running 'make_some_value' (which is a list when captured by $(...))
match "$(make_some_value)" as value {
(hello*) { echo "Hi!" }
(say\ *) { echo "No, I will not $value" }
}
# Match the result of running 'make_some_value', cast to a string.
match "$(make_some_value)" {
hello* { echo "Hi!" }
say\ * { echo "No, I will not!" }
}
```
## Formal Grammar
### Shell Grammar