From da6d7b188f4797731147700af5e4ea078bbb517a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Javier=20L=C3=B3pez?= <chilicuil@users.noreply.github.com>
Date: Wed, 4 Nov 2015 22:56:36 -0600
Subject: [PATCH] update virn

make virn sh posix portable
add directory support
add options, --editor, --help
add usage
---
 virn | 161 +++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 124 insertions(+), 37 deletions(-)

diff --git a/virn b/virn
index 6745cfb..d467f20 100755
--- a/virn
+++ b/virn
@@ -1,48 +1,135 @@
-#!/usr/bin/env bash
+#!/bin/sh
 # virn, Copyright (C) 2007-2010 by Jonas Kramer. All rights reserved.
 # Published under the terms of the GNU General Public License (GPL).
 
-# This is a more portable BASH remake of my old script "vimove" which depended
-# on ZSH.
+_usage()
+{
+    printf "%s\\n" "Usage: $(expr "${0}" : '.*/\([^/]*\)') [options] file ..." >&2
+    printf "%s\\n" "Rename lots of files using your favorite text editor." >&2
+    printf "\\n" >&2
+    printf "%b\\n" "  -e, --editor   use this editor instead of the default \$EDITOR" >&2
+    printf "%b\\n" "  -h, --help     show this help message and exit" >&2
+    exit 1
+}
 
-die () {
-    echo "$@" >&2
-    exit -1
+_die()
+{
+    [ -z "${1}" ] && return 1
+    printf "%b\\n" "$(expr "${0}" : '.*/\([^/]*\)'): ${*}" >&2
+    exit 1
 }
 
-# Verify that there's an $EDITOR defined.
-[ -z "$EDITOR" ] && die '$EDITOR not defined.'
+_mkdir_p()
+{   #portable mkdir -p function
+    for _mkdir_p__dir; do
+        _mkdir_p__IFS="$IFS"
+        IFS="/"
+        set -- $_mkdir_p__dir
+        IFS="$_mkdir_p__IFS"
+        (
+        case "$_mkdir_p__dir" in
+            /*) cd /; shift ;;
+        esac
+        for _mkdir_p__subdir; do
+            [ -z "${_mkdir_p__subdir}" ] && continue
+            if [ -d "${_mkdir_p__subdir}" ] || mkdir "${_mkdir_p__subdir}"; then
+                if cd "${_mkdir_p__subdir}"; then
+                    :
+                else
+                    printf "%s\\n" "_mkdir_p: Can't enter ${_mkdir_p__subdir} while creating ${_mkdir_p__dir}"
+                    exit 1
+                fi
+            else
+                exit 1
+            fi
+        done
+        )
+    done
+    unset _mkdir_p__dir
+}
 
-# Exit before doing anything if there are no arguments anyway.
-ARGV=("$@")
-[ $# -eq 0 ] && exit
+_dirname()
+{   #return string containing dirname on success, 1 on failure
+    [ -z "${1}" ] && return 1
 
-# Create targets file.
-TARGETS="/tmp/virn-$RANDOM"
-for FILE in "$@"; do echo "$FILE" >> $TARGETS; done
-
-# Start the $EDITOR so we can edit our file names.
-if $EDITOR $TARGETS; then
-	FILENO=0
-	COUNT="`wc -l $TARGETS | sed -nre 's/^[ \t]*([0-9]+).*$/\1/p'`"
-
-	# Exit with error message if number of arguments and line count of
-	# targets file differ.
-	if [ "$COUNT" -ne "$#" ]; then
-		rm $TARGETS
-        die 'Numbers of files mismatch.'
-	fi
-
-	# Read targets file line by line and rename the source
-	# files from ARGV appropriately.
-	while read TARGET; do
-		SOURCE="${ARGV[$FILENO]}"
-		if [ "$SOURCE" != "$TARGET" ]; then
-			mv -f -- "$SOURCE" "$TARGET"
-		fi
-		FILENO=$[$FILENO+1]
-	done < $TARGETS
+    #http://www.linuxselfhelp.com/gnu/autoconf/html_chapter/autoconf_10.html
+    case "${1}" in
+        /*|*/*) _dirname__dir=$(expr "x${1}" : 'x\(.*\)/[^/]*' \| '.' : '.')
+                printf "%s\\n" "${_dirname__dir}" ;;
+             *) printf "%s\\n" ".";;
+    esac
+}
+
+if [ ! -t 0 ]; then
+    #there is input comming from pipe or file, add to the end of $@
+    set -- "${@}" $(cat)
 fi
 
-rm $TARGETS
+[ "${#}" -eq "0" ] && _usage
+
+for arg; do #parse options
+    case "${arg}" in
+        -h|--help) _usage ;;
+        -e|--editor)
+            if [ "${#}" -gt "1" ]; then
+                editor="$(printf "%s " "${@}" | awk '{print $2}')"
+                shift && shift
+            else
+                _die "Option \`${arg}' requires a parameter"
+            fi ;;
+        -*) printf "%s\\n" "$(expr "${0}" : '.*/\([^/]*\)'): unrecognized option \`${arg}'" >&2; _usage ;;
+    esac
+done
+
+[ -z "${editor}" ] && editor="${EDITOR}"
+[ -z "${EDITOR}" ] && _die "\${EDITOR} not defined."
+
+# Create targets file.
+targets="/tmp/virn-${$}"
+i=0; for FILE; do
+    [ -e "${FILE}" ] || {
+        i="$((i+1))";
+        printf "%s\\n" "Warning: '${FILE}' doesn't exist, skipping ..." >&2 ;
+        continue; }
+    printf "%s\\n" "${FILE}" >> "${targets}"
+done
+
+[ ! -f "${targets}" ] && exit
+
+# Start $EDITOR
+if ${editor} ${targets}; then
+        [ ! -t 0 ] && reset
+        count="$(awk 'END {print NR}' "${targets}" 2>/dev/null)"
+        param_len="${#}"; param_len="$((param_len - i))"
+
+        # Exit with error message if number of arguments and line count of
+        # targets file differ.
+        if [ "${count}" -ne "${param_len}" ]; then
+            rm -- "${targets}"
+            _die 'Numbers of files mismatch.'
+        fi
+
+        # Read targets file line by line and rename the source
+        # files from ARGV appropriately.
+        while read target; do
+            while [ ! -e "${source}" ]; do
+                source="${1}"
+                shift
+            done
+            if [ X"${source}" != X"${target}" ]; then
+                case "${target}" in
+                    /*|*/*)
+                        target="$(printf "%s" "${target}" | \
+                            sed "s:\$HOME:$HOME:g;s:~/:$HOME/:;")"
+                        _mkdir_p "$(_dirname "${target}")" ;;
+                esac
+                mv -v -f -- "${source}" "${target}"
+                case "${source}" in
+                    /*|*/*) rmdir -p "$(_dirname "${source}")" 2>/dev/null ;;
+                esac
+            fi
+            source=""
+        done < "${targets}"
+fi
 
+rm "${targets}"