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Base: Document the new brace expansions in Shell's manpage

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AnotherTest 2020-10-24 18:36:51 +03:30 • committed by Andreas Kling
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Base/usr/share/man/man5/Shell.md
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@ -108,10 +108,19 @@ The shell performs various expansions, in different stages.
* Variable Expansion: Variables shall be expanded preserving their types.
* Brace Expansions: Brace expansions shall be expanded to a list.
* Juxtaposition Expansion: Juxtapositions shall be expanded as list products.
* Other expansions: Tildes, Evaluate expressions, etc. shall be expanded as needed.
### Brace Expansions
Brace expansions are of two kinds, _normal brace expansions_ and _range brace expansions_.
_Normal brace expansions_ are sequences of optional expressions inside braces (`{}`), delimited by a comma (`','`); a missing expression is treated as an empty string literal. Such expressions are simply expanded to the expressions they enclose.
_Range brace expansions_ are of the form `{start_expression..end_expression}`, where `start_expression` and `end_expression` denote the bounds of an inclusive _range_, and can be one of two types:
- Single unicode code points: The range expands to all code points between the start and end, e.g. `{a..c}` shall expand to the list `(a b c)`.
- Numbers: The range expands to all numbers between the start and end, e.g. `{8..11}` shall expand to the list `(8 9 10 11)`.
### Juxtapositions
Any two expressions joined without any operator are considered to be in a Juxtaposition, with the resulting value being the list product of two expressions.
For instance, `(1 2)(3 4)` shall be evaluated to `(13 14 23 24)` by calculating the list product of the two expressions `(1 2)` and `(3 4)`.
@ -341,6 +350,7 @@ string_composite :: string string_composite?
| variable string_composite?
| bareword string_composite?
| glob string_composite?
| brace string_composite?
string :: '"' dquoted_string_inner '"'
| "'" [^']* "'"
@ -368,6 +378,11 @@ bareword_with_tilde_expansion :: '~' bareword?
glob :: [*?] bareword?
| bareword [*?]
brace_expansion :: '{' brace_expansion_spec '}'
brace_expansion_spec :: expression? (',' expression?)*
| expression '..' expression
digit :: <native hex digit>
number :: <number in base 10>
identifier :: <string of word characters>