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 -q         Quiet
  28 -v         Verbose
  29 -b         Keep backup file
  30 -h|--help  Help"
  31   local s diff name init
  32   local file_dir="$(dirname "$file")"
  33   local exists=true
  34   local verbose=false
  35   local backup=false
  36   local quiet=false
  37
  38   case $1 in
  39     -b) backup=true; shift ;;
  40     -v) verbose=true; shift ;;
  41     -q) quiet=true; shift ;;
  42     -h|--help) echo "$help"; return ;;
  43   esac
  44
  45   if (( $# == 2 )); then
  46     name=": $1"
  47     shift
  48   fi
  49
  50   local file="$1"
  51   local file_name="${file##*/}"
  52
  53   local begin="#_#_# start delimiter of cedit section$name. do not modify. #_#_#"
  54   local end="#_#_# end delimiter of cedit section$name. do not modify. #_#_#"
  55
  56   if [[ ! -e $file_dir ]]; then
  57     if ! mkdir -p $file_dir; then
  58       s=sudo
  59       $s mkdir -p $file_dir || return 2
  60     fi
  61   fi
  62   if [[ ! -e $file ]]; then
  63     exists=false
  64     if ! $s touch $file; then
  65       s=sudo
  66       $s touch $file || return 2
  67     fi
  68   fi
  69
  70   [[ -w $file ]] || s=sudo
  71
  72
  73   local in_section=false
  74   if $exists; then
  75     local tailn=1
  76     local temp="$(mktemp -d)/$file_name"
  77     cp "$file" "$temp"
  78     cp /dev/null "$file"
  79     while IFS= read -r line; do
  80       tailn=$(( tailn + 1 ))
  81       if [[ $line == "$begin" ]]; then
  82         in_section=true;
  83         break
  84       fi
  85       printf '%s\n' "$line" >> $file
  86     done < "$temp"
  87   fi
  88
  89   IFS= read -d '' -n 1 -r init
  90   if [[ $init ]]; then
  91     $s tee -a "$file" >/dev/null <<<"$begin"
  92     printf '%s' "$init" | $s tee -a "$file" >/dev/null
  93     $s tee -a "$file" >/dev/null
  94     $s tee -a "$file" >/dev/null <<<"$end"
  95   fi
  96
  97   if $exists && $in_section; then
  98     while IFS= read -r line; do
  99       if [[ $line == "$begin" ]]; then
 100         in_section=true;
 101       fi
 102       if ! $in_section; then
 103         printf '%s\n' "$line" >> $file
 104       fi
 105       if [[ $line == $end ]]; then
 106         in_section=false;
 107       fi
 108     done < <(tail -n +$tailn "$temp")
 109   fi
 110
 111
 112   if ! $exists; then
 113     ret=1
 114     if $verbose; then
 115       echo "New file $file:"
 116       cat "$file"
 117     fi
 118   elif type -t diff &>/dev/null; then
 119     diff=$(diff -u "$temp" "$file")
 120     ret=$?
 121     if (( $ret )) && ! $quiet; then
 122       echo "backup of original at $temp"
 123       echo diff -u "$temp" "$file":
 124       echo "$diff"
 125       #elif $debug; then
 126       #  echo "No changes made to $file"
 127     fi
 128   else
 129     # for systems like openwrt which don't have diff
 130     diff=$(cmp "$temp" "$file")
 131     ret=$?
 132     if $verbose; then
 133       echo "$diff"
 134     fi
 135   fi
 136   if ! $backup && $exists; then
 137     rm -r "$temp"
 138   fi
 139   return $ret
 140 }
 141 cedit "$@"