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 -h|--help  Help"
  29     local s diff name init
  30     local file_dir="$(dirname "$file")"
  31     local exists=true
  32     local verbose=false
  33
  34     case $1 in
  35         -v) verbose=true; shift ;;
  36         -h|--help) echo "$help"; return ;;
  37     esac
  38
  39     if (( $# == 2 )); then
  40         name=": $1"
  41         shift
  42     fi
  43
  44     local file="$1"
  45     local file_name="${file##*/}"
  46
  47     local begin="#_#_# start delimiter of cedit section$name. do not modify. #_#_#"
  48     local end="#_#_# end delimiter of cedit section$name. do not modify. #_#_#"
  49
  50     if [[ ! -e $file_dir ]]; then
  51         if ! mkdir -p $file_dir; then
  52             s=sudo
  53             $s mkdir -p $file_dir || return 2
  54         fi
  55     fi
  56     if [[ ! -e $file ]]; then
  57         exists=false
  58         if ! $s touch $file; then
  59             s=sudo
  60             $s touch $file || return 2
  61         fi
  62     fi
  63
  64     [[ -w $file ]] || s=sudo
  65
  66
  67     if $exists; then
  68         local temp="$(mktemp -d)/$file_name"
  69         cp "$file" "$temp"
  70         cp /dev/null "$file"
  71         local in_section=false
  72         while IFS= read -r line; do
  73             if [[ $line == $begin ]]; then
  74                 in_section=true;
  75             fi
  76             if ! $in_section; then
  77                 printf '%s\n' "$line" >> $file
  78             fi
  79             if [[ $line == $end ]]; then
  80                 in_section=false;
  81             fi
  82         done < "$temp"
  83     fi
  84
  85     IFS= read -d '' -n 1 -r init
  86     if [[ $init ]]; then
  87         $s tee -a "$file" >/dev/null <<<"$begin"
  88         printf '%s' "$init" | $s tee -a "$file" >/dev/null
  89         $s tee -a "$file" >/dev/null
  90         $s tee -a "$file" >/dev/null <<<"$end"
  91     fi
  92
  93     if ! $exists; then
  94         ret=1
  95         if $verbose; then
  96             echo "New file $file:"
  97             cat "$file"
  98         fi
  99     elif type -t diff &>/dev/null; then
 100         diff=$(diff -u "$temp" "$file")
 101         ret=$?
 102         if $verbose; then
 103             if (( $ret == 0 )); then
 104                 echo "No changes made to $file"
 105             fi
 106         else
 107             echo "backup of original at $temp"
 108             echo diff -u "$temp" "$file":
 109             echo "$diff"
 110         fi
 111     else
 112         # for systems like openwrt which don't have diff
 113         diff=$(cmp "$temp" "$file")
 114         ret=$?
 115         if $verbose; then
 116             echo "$diff"
 117         fi
 118     fi
 119     return $ret
 120 }
 121 cedit "$@"