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prezto/modules/helper/init.zsh

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