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#!/usr/bin/env bash
# All the prefixes to consider
prefixes=(
"$HOME"
"$HOME/.local.$(uname -m)"
"$HOME/.local"
"$HOME/.prefix.$(uname -m)"
"$HOME/.prefix"
"$HOME"/.gem/ruby/*
"$HOME"/.npm-prefix
)
in_array() {
local needle=$1; shift
local haystack=("$@")
local straw
for straw in "${haystack[@]}"; do
[[ "$needle" == "$straw" ]] && return 0
done
return 1
}
var_init() {
eval "ary_$1=(\$$1)"
}
var_add() {
local varname=ary_$1; shift
local var_all="${varname}[@]"
local dirs=("$@")
local dir
for dir in "${dirs[@]}"; do
if [[ -d "$dir" ]] && ! in_array "$dir" "${!var_all}"; then
eval "$varname=(\"\$dir\" \"\${$var_all}\")"
fi
done
}
var_done() {
eval "$1=\"\${ary_$1[*]}\""
declare -p $1
}
main() {
export LC_ALL=C # Work around brokenly slow Unicode handling
# in Bash
IFS=:
# Import existing values
var_init PATH
var_init MANPATH
var_init LD_LIBRARY_PATH
var_init RUBYLIB
var_init PERL5LIB
# Scan through prefixes
for prefix in "${prefixes[@]}"; do
var_add PATH "$prefix/bin" "$prefix/sbin"
var_add MANPATH "$prefix/share/man"
var_add LD_LIBRARY_PATH "$prefix"/lib{,32,64}
var_add RUBYLIB "$prefix"/lib{,32,64}
var_add PERL5LIB "$prefix"/lib{,32,64}/perl5
done
# Finally, print the values
lines=()
for var in PATH MANPATH LD_LIBRARY_PATH RUBYLIB PERL5LIB; do
lines+=("$(var_done "$var")")
done
shopt -s extglob
printf -- '%s\n' "${lines[@]##declare *(-+([[:graph:]]) )}"
}
main "$@"
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