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dotfiles/.config/zsh/lib/alternatives.zsh

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#!/bin/zsh
## alternatives list is pipe-separated list of commands/binaries
## find (first) candidate in alternatives
## $1 - alternatives list
## $2 - arguments to test command (USE WITH CAUTION!)
z-alt-find() {
local i c r t
local -a v a
v=( ${(@s:|:)1} )
[ ${#v} = 0 ] && v=( "$1" )
for i ( $v ) ; do
a=( ${(@s: :)i} )
c=$(which "${a[1]}")
[ -z "$c" ] && continue
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a[1]="$c"
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# r=$(readlink -f "$c" 2>/dev/null)
# [ -z "$r" ] && continue
# a[1]="$r"
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if [ -n "$2" ] ; then
t="$a $2"
command ${(@s: :)t} </dev/null &>/dev/null || continue
fi
echo "${a[@]}"
return 0
done
return 127
}
## set function alias for alternative (one-time static resolve)
## $1 - function name
## $2 - alternatives list
## $3 - command wrapper
## $4 - function prologue
## $5 - function epilogue
z-alt-set-static() {
local n t a r
local -a s
n="$1" ; t=''
if [[ "$n" =~ '\|' ]] ; then
t=${n:${MBEGIN}} ; n=${n:0:${MBEGIN}-1}
fi
a=$(z-alt-find "$2" "$t")
if [ -n "$a" ] ; then
r=0
[ -n "$4" ] && s+=( "$4 ;" )
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s+=( "${3:-command}" )
s+=( "$a \"\$@\" || return 127" )
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[ -n "$5" ] && s+=( "; $5" )
else
r=127
s+=( 'return 127' )
fi
eval "$n () { ${s[@]} ; } ; typeset -g $n"
return $r
}
## set function alias for alternative (dynamic resolve)
## $1 - function name
## $2 - alternatives list
## $3 - command wrapper
## $4 - function prologue
## $5 - function epilogue
z-alt-set-dynamic() {
local n t
local -a s
n="$1" ; t=''
if [[ "$n" =~ '\|' ]] ; then
t=${n:${MBEGIN}} ; n=${n:0:${MBEGIN}-1}
fi
[ -n "$4" ] && s+=( "$4 ;" )
s+=( 'local a=$(z-alt-find' "${(qq)2}" "${t:+' $t'} ) ;" )
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s+=( "${3:-command}" )
s+=( '${(@s: :)a} "$@" || return 127' )
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[ -n "$5" ] && s+=( "; $5" )
eval "$n () { ${s[@]} ; } ; typeset -g $n"
}