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#!/bin/bash
the_guts() {
# Add generic prefixes
add_prefix "$HOME"
add_prefix "$HOME/.local.$(uname -m)"
add_prefix "$HOME/.local"
add_prefix "$HOME/.prefix.$(uname -m)"
add_prefix "$HOME/.prefix"
# Add rubygem prefixes
local dir
for dir in "$HOME"/.gem/*; do
# Only add it if we have that type of ruby
if type "${dir##*/}" &>/dev/null; then
add_prefix "$dir"/*
fi
done
}
in_array() {
local needle=$1; shift
local haystack=("$@")
local straw
for straw in "${haystack[@]}"; do
[[ "$needle" == "$straw" ]] && return 0
done
return 1
}
add_prefix() {
local prefix=$1
local dir
# PATH
dir="$prefix/bin"
if [[ -d "$dir" ]] && ! in_array "$dir" "${paths[@]}"; then
paths=("$dir" "${paths[@]}")
fi
# RUBYLIB
dir="$prefix/lib"
if [[ -d "$dir" ]] && ! in_array "$dir" "${rubylibs[@]}"; then
rubylibs=("$dir" "${rubylibs[@]}")
fi
}
main() {
# Import existing values
declare -ga paths rubylibs
IFS=: paths=($PATH)
IFS=: rubylibs=($RUBYLIB)
the_guts
# Put our values into the env variables
IFS=: PATH="${paths[*]}"
IFS=: RUBYLIB="${rubylibs[*]}"
# Finally, print the values
# The sed bit here is the only time we call an external program
{
declare -p PATH
declare -p RUBYLIB
} | sed 's/^declare \(-\S* \)*//'
}
main
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