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 The section is #comment delimited. Reads STDIN for the contents of the
  21 section. Without SECTION_NAME, it acts on a global unnamed
  22 section. cedit is short for config edit.
  23
  24 -v         Verbose
  25 -h|--help  Help"
  26     local s diff name init
  27     local file_dir="$(dirname "$file")"
  28     local exists=true
  29     local verbose=false
  30
  31     case $1 in
  32         -v) verbose=true; shift ;;
  33         -h|--help) echo "$help"; return ;;
  34     esac
  35
  36     if (( $# == 2 )); then
  37         name=": $1"
  38         shift
  39     fi
  40
  41     local file="$1"
  42     local file_name="${file##*/}"
  43
  44     local begin="#_#_# start delimiter of cedit section$name. do not modify. #_#_#"
  45     local end="#_#_# end delimiter of cedit section$name. do not modify. #_#_#"
  46
  47     if [[ ! -e $file_dir ]]; then
  48         if ! mkdir -p $file_dir; then
  49             s=sudo
  50             $s mkdir -p $file_dir || return 1
  51         fi
  52     fi
  53     if [[ ! -e $file ]]; then
  54         exists=false
  55         if ! $s touch $file; then
  56             s=sudo
  57             $s touch $file || return 1
  58         fi
  59     fi
  60
  61     [[ -w $file ]] || s=sudo
  62
  63
  64     if $exists; then
  65         local temp="$(mktemp -d)/$file_name"
  66         cp "$file" "$temp"
  67         cp /dev/null "$file"
  68         local in_section=false
  69         while IFS= read -r line; do
  70             if [[ $line == $begin ]]; then
  71                 in_section=true;
  72             fi
  73             if ! $in_section; then
  74                 printf '%s\n' "$line" >> $file
  75             fi
  76             if [[ $line == $end ]]; then
  77                 in_section=false;
  78             fi
  79         done < "$temp"
  80     fi
  81
  82     IFS= read -d '' -n 1 -r init
  83     if [[ $init ]]; then
  84         $s tee -a "$file" >/dev/null <<<"$begin"
  85         printf '%s' "$init" | $s tee -a "$file" >/dev/null
  86         $s tee -a "$file" >/dev/null
  87         $s tee -a "$file" >/dev/null <<<"$end"
  88     fi
  89
  90     if ! $exists; then
  91         ret=0
  92         if $verbose; then
  93             echo "New file $file:"
  94             cat "$file"
  95         fi
  96     elif type -t diff &>/dev/null; then
  97         diff=$(diff -u "$temp" "$file")
  98         ret=$?
  99         if $verbose; then
 100             if (( $ret == 0 )); then
 101                 echo "No changes made to $file"
 102             fi
 103         else
 104
 105             echo "backup of original at $temp"
 106             echo diff -u "$temp" "$file":
 107             echo "$diff"
 108         fi
 109     else
 110         diff=$(cmp "$temp" "$file")
 111         if $verbose; then
 112             echo "$diff"
 113         fi
 114     fi
 115     return 0
 116 }
 117 cedit "$@"