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prezto/helper.zsh

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#
# Defines helper functions.
#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
# 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]|)) ]]
}
# Checks a name if it is a command, function, or alias.
function is-callable {
(( $+commands[$1] )) || (( $+functions[$1] )) || (( $+aliases[$1] ))
}
# Prints the first non-empty string in the arguments array.
function coalesce {
for arg in $argv; do
print "$arg"
return 0
done
return 1
}
# Checks if a file can be autoloaded by trying to load it in a subshell.
function autoloadable {
( unfunction $1 ; autoload -U +X $1 ) &> /dev/null
}
# Loads Prezto modules.
function pmodload {
local -a pmodules
local pmodule
local pfunction_glob='^([_.]*|prompt_*_setup|README*)(.N:t)'
# $argv is overridden in the anonymous function.
pmodules=("$argv[@]")
# Add functions to $fpath.
fpath=(${pmodules:+$PREZTO_HOME/modules/${^pmodules}/functions(/FN)} $fpath)
function {
local pfunction
# Extended globbing is needed for listing autoloadable function directories.
setopt LOCAL_OPTIONS EXTENDED_GLOB
# Load Prezto functions.
for pfunction in $PREZTO_HOME/modules/${^pmodules}/functions/$~pfunction_glob; do
autoload -Uz "$pfunction"
done
}
# Load Prezto modules.
for pmodule in "$pmodules[@]"; do
if zstyle -t ":prezto:module:$pmodule" loaded; then
continue
elif [[ ! -d "$PREZTO_HOME/modules/$pmodule" ]]; then
print "$0: no such module: $pmodule" >&2
continue
else
if [[ -s "$PREZTO_HOME/modules/$pmodule/init.zsh" ]]; then
source "$PREZTO_HOME/modules/$pmodule/init.zsh"
fi
if (( $? == 0 )); then
zstyle ":prezto:module:$pmodule" loaded 'yes'
else
# Remove the $fpath entry.
fpath[(r)${ZDOTDIR:-$HOME}/.zprezto/modules/${pmodule}/functions]=()
function {
local pfunction
# Extended globbing is needed for listing autoloadable function
# directories.
setopt LOCAL_OPTIONS EXTENDED_GLOB
# Unload Prezto functions.
for pfunction in $PREZTO_HOME/modules/$pmodule/functions/$~pfunction_glob; do
unfunction "$pfunction"
done
}
zstyle ":prezto:module:$pmodule" loaded 'no'
fi
fi
done
}