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Shell: Add support for 'immediate' expressions as variable substitutions

This commit adds a few basic variable substitution operations:
- length
    Find the length of a string or a list
- length_across
    Find the lengths of things inside a list
- remove_{suffix,prefix}
    Remove a suffix or a prefix from all the passed values
- regex_replace
    Replace all matches of a given regex with a given template
- split
    Split the given string with the given delimiter (or to its
    code points if the delimiter is empty)
- concat_lists
    concatenates any given lists into one

Closes #4316 (the ancient version of this same feature)
This commit is contained in:
AnotherTest 2021-03-05 16:33:23 +03:30 committed by Andreas Kling
parent a303b69caa
commit a45b2ea6fb
16 changed files with 911 additions and 37 deletions

View file

@ -98,6 +98,7 @@ private:
RefPtr<AST::Node> parse_glob();
RefPtr<AST::Node> parse_brace_expansion();
RefPtr<AST::Node> parse_brace_expansion_spec();
RefPtr<AST::Node> parse_immediate_expression();
template<typename A, typename... Args>
NonnullRefPtr<A> create(Args... args);
@ -238,6 +239,7 @@ list_expression :: ' '* expression (' '+ list_expression)?
expression :: evaluate expression?
| string_composite expression?
| comment expression?
| immediate_expression expression?
| history_designator expression?
| '(' list_expression ')' expression?
@ -268,6 +270,10 @@ variable :: '$' identifier
comment :: '#' [^\n]*
immediate_expression :: '$' '{' immediate_function expression* '}'
immediate_function :: identifier { predetermined list of names, see Shell.h:ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS }
history_designator :: '!' event_selector (':' word_selector_composite)?
event_selector :: '!' {== '-0'}