iankelling.org Git - cedit/blob - cedit

   1 #!/bin/bash
   2 # Copyright (C) 2016 Ian Kelling
   3
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 cedit() {
  17     local help="Usage: [-h|--help ] [-v] [SECTION_NAME] FILE
  18 Create/modify a section in a config file
  19
  20 Returns 1 if the file is modified by this command, 2 or higher
  21 for other problems.
  22
  23 The section is #comment delimited. Reads STDIN for the contents of the
  24 section. Without SECTION_NAME, it acts on a global unnamed
  25 section. cedit is short for config edit.
  26
  27 -v         Verbose
  28 -b         Keep backup file
  29 -h|--help  Help"
  30     local s diff name init
  31     local file_dir="$(dirname "$file")"
  32     local exists=true
  33     local verbose=false
  34     local backup=false
  35
  36     case $1 in
  37         -b) backup=true; shift ;;
  38         -v) verbose=true; shift ;;
  39         -h|--help) echo "$help"; return ;;
  40     esac
  41
  42     if (( $# == 2 )); then
  43         name=": $1"
  44         shift
  45     fi
  46
  47     local file="$1"
  48     local file_name="${file##*/}"
  49
  50     local begin="#_#_# start delimiter of cedit section$name. do not modify. #_#_#"
  51     local end="#_#_# end delimiter of cedit section$name. do not modify. #_#_#"
  52
  53     if [[ ! -e $file_dir ]]; then
  54         if ! mkdir -p $file_dir; then
  55             s=sudo
  56             $s mkdir -p $file_dir || return 2
  57         fi
  58     fi
  59     if [[ ! -e $file ]]; then
  60         exists=false
  61         if ! $s touch $file; then
  62             s=sudo
  63             $s touch $file || return 2
  64         fi
  65     fi
  66
  67     [[ -w $file ]] || s=sudo
  68
  69
  70     if $exists; then
  71         local temp="$(mktemp -d)/$file_name"
  72         cp "$file" "$temp"
  73         cp /dev/null "$file"
  74         local in_section=false
  75         while IFS= read -r line; do
  76             if [[ $line == $begin ]]; then
  77                 in_section=true;
  78             fi
  79             if ! $in_section; then
  80                 printf '%s\n' "$line" >> $file
  81             fi
  82             if [[ $line == $end ]]; then
  83                 in_section=false;
  84             fi
  85         done < "$temp"
  86     fi
  87
  88     IFS= read -d '' -n 1 -r init
  89     if [[ $init ]]; then
  90         $s tee -a "$file" >/dev/null <<<"$begin"
  91         printf '%s' "$init" | $s tee -a "$file" >/dev/null
  92         $s tee -a "$file" >/dev/null
  93         $s tee -a "$file" >/dev/null <<<"$end"
  94     fi
  95
  96     if ! $exists; then
  97         ret=1
  98         if $verbose; then
  99             echo "New file $file:"
 100             cat "$file"
 101         fi
 102     elif type -t diff &>/dev/null; then
 103         diff=$(diff -u "$temp" "$file")
 104         ret=$?
 105         if $verbose; then
 106             if (( $ret == 0 )); then
 107                 echo "No changes made to $file"
 108             fi
 109         else
 110             echo "backup of original at $temp"
 111             echo diff -u "$temp" "$file":
 112             echo "$diff"
 113         fi
 114     else
 115         # for systems like openwrt which don't have diff
 116         diff=$(cmp "$temp" "$file")
 117         ret=$?
 118         if $verbose; then
 119             echo "$diff"
 120         fi
 121     fi
 122     if ! $backup; then
 123         rm -r $"$temp"
 124     fi
 125     return $ret
 126 }
 127 cedit "$@"