33 lines
756 B
Bash
33 lines
756 B
Bash
#
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# Defines helper functions.
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#
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# Authors:
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# Sorin Ionescu <sorin.ionescu@gmail.com>
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#
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# Checks if a file can be autoloaded by trying to load it in a subshell.
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function is-autoloadable {
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( unfunction $1 ; autoload -U +X $1 ) &> /dev/null
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}
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# Checks if a name is a command, function, or alias.
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function is-callable {
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(( $+commands[$1] )) || (( $+functions[$1] )) || (( $+aliases[$1] ))
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}
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# Checks a boolean variable for "true".
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# Case insensitive: "1", "y", "yes", "t", "true", "o", and "on".
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function is-true {
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[[ -n "$1" && "$1" == (1|[Yy]([Ee][Ss]|)|[Tt]([Rr][Uu][Ee]|)|[Oo]([Nn]|)) ]]
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}
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# Prints the first non-empty string in the arguments array.
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function coalesce {
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for arg in $argv; do
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print "$arg"
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return 0
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done
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return 1
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}
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