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 -s         Silent. Quiet and exit 0 on modified file.
  29 -v         Verbose
  30 -b         Keep backup file
  31 -h|--help  Help"
  32   local s diff name init file_dir exists verbose backup quiet silent
  33   file_dir="$(dirname "$file")"
  34   exists=true
  35   verbose=false
  36   backup=false
  37   quiet=false
  38   silent=false
  39
  40   case $1 in
  41     -b) backup=true; shift ;;
  42     -v) verbose=true; shift ;;
  43     -q) quiet=true; shift ;;
  44     -s) quiet=true; silent=true; shift ;;
  45     -h|--help) echo "$help"; return ;;
  46   esac
  47
  48   if (( $# == 2 )); then
  49     name=": $1"
  50     shift
  51   fi
  52
  53   local file="$1"
  54   local file_name="${file##*/}"
  55
  56   local comment
  57   comment="#_#_#"
  58
  59   # bind zone files use ; for comments yes, a little hacky detection.
  60   if [[ $file_name == db.* ]]; then
  61     comment=";;_;_;"
  62   fi
  63   local begin="$comment start delimiter of cedit section$name. do not modify. $comment"
  64   local end="$comment end delimiter of cedit section$name. do not modify. $comment"
  65
  66   if [[ ! -e $file_dir ]]; then
  67     if ! mkdir -p $file_dir; then
  68       s=sudo
  69       $s mkdir -p $file_dir || return 2
  70     fi
  71   fi
  72   if [[ ! -e $file ]]; then
  73     exists=false
  74     if ! $s touch $file; then
  75       s=sudo
  76       $s touch $file || return 2
  77     fi
  78   fi
  79
  80   [[ -w $file ]] || s=sudo
  81
  82
  83   local in_section=false
  84   if $exists; then
  85     local tailn=1
  86     local temp="$(mktemp -d)/$file_name"
  87     cp "$file" "$temp"
  88     cp /dev/null "$file"
  89     while IFS= read -r line; do
  90       tailn=$(( tailn + 1 ))
  91       if [[ $line == "$begin" ]]; then
  92         in_section=true;
  93         break
  94       fi
  95       printf '%s\n' "$line" >> $file
  96     done < "$temp"
  97   fi
  98
  99   IFS= read -d '' -n 1 -r init
 100   if [[ $init ]]; then
 101     $s tee -a "$file" >/dev/null <<<"$begin"
 102     printf '%s' "$init" | $s tee -a "$file" >/dev/null
 103     $s tee -a "$file" >/dev/null
 104     $s tee -a "$file" >/dev/null <<<"$end"
 105   fi
 106
 107   if $exists && $in_section; then
 108     while IFS= read -r line; do
 109       if [[ $line == "$begin" ]]; then
 110         in_section=true;
 111       fi
 112       if ! $in_section; then
 113         printf '%s\n' "$line" >> $file
 114       fi
 115       if [[ $line == $end ]]; then
 116         in_section=false;
 117       fi
 118     done < <(tail -n +$tailn "$temp")
 119   fi
 120
 121
 122   if ! $exists; then
 123     ret=1
 124     if $verbose; then
 125       echo "New file $file:"
 126       cat "$file"
 127     fi
 128   elif type -t diff &>/dev/null; then
 129     diff=$(diff -u "$temp" "$file")
 130     ret=$?
 131     if (( $ret )) && ! $quiet; then
 132       echo "backup of original at $temp"
 133       echo diff -u "$temp" "$file":
 134       echo "$diff"
 135       #elif $debug; then
 136       #  echo "No changes made to $file"
 137     fi
 138   else
 139     # for systems like openwrt which don't have diff
 140     diff=$(cmp "$temp" "$file")
 141     ret=$?
 142     if $verbose; then
 143       echo "$diff"
 144     fi
 145   fi
 146   if ! $backup && $exists; then
 147     rm -r "$temp"
 148   fi
 149   if $silent; then
 150     case $ret in
 151       0|1) return 0 ;;
 152       *) return $ret ;;
 153     esac
 154   else
 155     return $ret
 156   fi
 157 }
 158 cedit "$@"