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prezto/helper.zsh
2012-04-08 15:07:11 -04:00

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#
# Defines helper functions.
#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
# Checks 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
}
# Checks if a file can be autoloaded by trying to load it in a subshell.
function autoloadable {
( unfunction $1 ; autoload -U +X $1 ) &> /dev/null
}
# Loads Oh My Zsh modules.
function omodload {
local omodule
# Extended globbing is needed for autoloading of module functions.
setopt EXTENDED_GLOB
# Add functions and completions to fpath.
fpath=(${argv:+${OMZ}/modules/${^argv}/{functions,completions}(/FN)} $fpath)
# Load Oh My Zsh functions.
for ofunction in $OMZ/modules/**/functions/^([_.]*|prompt_*_setup)(.N:t); do
autoload -Uz "$ofunction"
done
unset ofunction
# Extended globbing is no longer needed.
unsetopt EXTENDED_GLOB
for omodule in "$argv[@]"; do
if zstyle -t ":omz:module:$omodule" loaded; then
continue
elif [[ ! -d "$OMZ/modules/$omodule" ]]; then
print "$0: no such module: $omodule" >&2
continue
else
if [[ -f "$OMZ/modules/$omodule/init.zsh" ]]; then
source "$OMZ/modules/$omodule/init.zsh"
fi
if (( $? == 0 )); then
zstyle ":omz:module:$omodule" loaded 'yes'
else
zstyle ":omz:module:$omodule" loaded 'no'
fi
fi
done
}
# Trap signals were generated with 'kill -l'.
# DEBUG, EXIT, and ZERR are Zsh signals.
TRAP_SIGNALS=(
ABRT ALRM BUS CHLD CONT EMT FPE HUP ILL INFO INT IO KILL PIPE PROF QUIT
SEGV STOP SYS TERM TRAP TSTP TTIN TTOU URG USR1 USR2 VTALRM WINCH XCPU XFSZ
DEBUG EXIT ZERR
)
# Adds a function to a list to be called when a trap is triggered.
function add-zsh-trap {
if (( $# < 2 )); then
print "usage: $0 type function" >&2
return 1
fi
if [[ -z "$TRAP_SIGNALS[(r)$1]" ]]; then
print "$0: unknown signal: $1" >&2
return 1
fi
local trap_functions="TRAP${1}_FUNCTIONS"
if (( ! ${(P)+trap_functions} )); then
typeset -gaU "$trap_functions"
fi
eval "$trap_functions+="$2""
if (( ! $+functions[TRAP${1}] )); then
eval "
function TRAP${1} {
for trap_function in \"\$TRAP${1}_FUNCTIONS[@]\"; do
if (( \$+functions[\$trap_function] )); then
\"\$trap_function\" \"\$1\"
fi
done
return \$(( 128 + \$1 ))
}
"
fi
}