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/edit a #comment delimited section of a file
  19
  20 Reads STDIN for the contents of the section. Without SECTION_NAME, it
  21 acts on a global unnamed section. cedit is short for config edit.
  22
  23 -v         Verbose
  24 -h|--help  Help"
  25     local s diff name init
  26     local file_dir="$(dirname "$file")"
  27     local exists=true
  28     local verbose=false
  29
  30     case $1 in
  31         -h|--help) echo "$help"; return ;;
  32     esac
  33
  34     if [[ $1 == -v ]]; then
  35         verbose=true
  36         shift
  37     fi
  38     if (( $# == 2 )); then
  39         name=": $1"
  40         shift
  41     fi
  42
  43     local file="$1"
  44     local file_name="${file##*/}"
  45
  46     local begin="#_#_# start delimiter of cedit section$name. do not modify. #_#_#"
  47     local end="#_#_# end delimiter of cedit section$name. do not modify. #_#_#"
  48
  49     if [[ ! -e $file_dir ]]; then
  50         if ! mkdir -p $file_dir; then
  51             s=sudo
  52             $s mkdir -p $file_dir || return 1
  53         fi
  54     fi
  55     if [[ ! -e $file ]]; then
  56         exists=false
  57         if ! $s touch $file; then
  58             s=sudo
  59             $s touch $file || return 1
  60         fi
  61     fi
  62
  63     [[ -w $file ]] || s=sudo
  64
  65
  66     if $exists; then
  67         local temp="$(mktemp -d)/$file_name"
  68         cp "$file" "$temp"
  69         cp /dev/null "$file"
  70         local in_section=false
  71         while IFS= read -r line; do
  72             if [[ $line == $begin ]]; then
  73                 in_section=true;
  74             fi
  75             if ! $in_section; then
  76                 printf '%s\n' "$line" >> $file
  77             fi
  78             if [[ $line == $end ]]; then
  79                 in_section=false;
  80             fi
  81         done < "$temp"
  82     fi
  83
  84     IFS= read -d '' -n 1 -r init
  85     if [[ $init ]]; then
  86         $s tee -a "$file" >/dev/null <<<"$begin"
  87         printf '%s' "$init" | $s tee -a "$file" >/dev/null
  88         $s tee -a "$file" >/dev/null
  89         $s tee -a "$file" >/dev/null <<<"$end"
  90     fi
  91
  92     if ! $exists; then
  93         ret=0
  94         if $verbose; then
  95             echo "New file $file:"
  96             cat "$file"
  97         fi
  98     elif type -t diff &>/dev/null; then
  99         diff=$(diff -u "$temp" "$file")
 100         ret=$?
 101         if $verbose; then
 102             if (( $ret == 0 )); then
 103                 echo "No changes made to $file"
 104             fi
 105         else
 106
 107             echo "backup of original at $temp"
 108             echo diff -u "$temp" "$file":
 109             echo "$diff"
 110         fi
 111     else
 112         diff=$(cmp "$temp" "$file")
 113         ret=$?
 114         if $verbose; then
 115             echo "$diff"
 116         fi
 117     fi
 118     return $ret
 119 }
 120 cedit "$@"