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