#bash #path_parser

path_parser

#!/bin/bash

#
# path parsing function built purely from bash
# http://stackoverflow.com/a/18455930/665507
#
function path() { 
    SAVEIFS=$IFS; IFS=""   # stash IFS for safe-keeping, etc.
    [[ $# != 2 ]] && echo "usage: path <path> <dir|name|fullname|ext>" && return    # demand 2 arguments
    [[ $1 =~ ^(.*/)?(.+)?$ ]] && {     # regex parse the path
        dir=${BASH_REMATCH[1]}
        file=${BASH_REMATCH[2]}
        ext=$([[ $file = *.* ]] && printf %s ${file##*.} || printf '')
        # edge cases for extesionless files and files like ".nesh_profile.coffee"
        [[ $file == $ext ]] && fnr=$file && ext='' || fnr=${file:0:$((${#file}-${#ext}))}
        case "$2" in
             dir) echo      "${dir%/*}"; ;;
            name) echo      "${fnr%.*}"; ;;
        fullname) echo "${fnr%.*}.$ext"; ;;
             ext) echo           "$ext"; ;;
        esac
    }
    IFS=$SAVEIFS
}

## USAGE
# SOMEPATH=/path/to.some/.random\ file.gzip
# path $SOMEPATH dir        # /path/to.some
# path $SOMEPATH name       # .random file
# path $SOMEPATH ext        # gzip
# path $SOMEPATH fullname   # .random file.gzip                     
# path gobbledygook         # usage: -bash <path> <dir|name|fullname|ext>