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() { # [-v] [section_name] FILE
  17
  18     local s diff name init
  19     local file_dir="$(dirname "$file")"
  20     local exists=true
  21     local verbose=false
  22
  23     if [[ $1 == -v ]]; then
  24         verbose=true
  25         shift
  26     fi
  27     if (( $# == 2 )); then
  28         name=": $1"
  29         shift
  30     fi
  31
  32     local file="$1"
  33     local file_name="${file##*/}"
  34
  35     local begin="#_#_# start delimiter of cedit section$name. do not modify. #_#_#"
  36     local end="#_#_# end delimiter of cedit section$name. do not modify. #_#_#"
  37
  38     if [[ ! -e $file_dir ]]; then
  39         if ! mkdir -p $file_dir; then
  40             s=sudo
  41             $s mkdir -p $file_dir || return 1
  42         fi
  43     fi
  44     if [[ ! -e $file ]]; then
  45         exists=false
  46         if ! $s touch $file; then
  47             s=sudo
  48             $s touch $file || return 1
  49         fi
  50     fi
  51
  52     [[ -w $file ]] || s=sudo
  53
  54
  55     if $exists; then
  56         local temp="$(mktemp -d)/$file_name"
  57         cp "$file" "$temp"
  58         cp /dev/null "$file"
  59         local in_section=false
  60         while IFS= read -r line; do
  61             if [[ $line == $begin ]]; then
  62                 in_section=true;
  63             fi
  64             if ! $in_section; then
  65                 printf '%s\n' "$line" >> $file
  66             fi
  67             if [[ $line == $end ]]; then
  68                 in_section=false;
  69             fi
  70         done < "$temp"
  71     fi
  72
  73     IFS= read -d '' -n 1 -r init
  74     if [[ $init ]]; then
  75         $s tee -a "$file" >/dev/null <<<"$begin"
  76         printf '%s' "$init" | $s tee -a "$file" >/dev/null
  77         $s tee -a "$file" >/dev/null
  78         $s tee -a "$file" >/dev/null <<<"$end"
  79     fi
  80
  81     if ! $exists; then
  82         ret=0
  83         if $verbose; then
  84             echo "New file $file:"
  85             cat "$file"
  86         fi
  87     elif type -t diff &>/dev/null; then
  88         diff=$(diff -u "$temp" "$file")
  89         ret=$?
  90         if $verbose; then
  91             if (( $ret == 0 )); then
  92                 echo "No changes made to $file"
  93             fi
  94         else
  95
  96             echo "backup of original at $temp"
  97             echo diff -u "$temp" "$file":
  98             echo "$diff"
  99         fi
 100     else
 101         diff=$(cmp "$temp" "$file")
 102         ret=$?
 103         if $verbose; then
 104             echo "$diff"
 105         fi
 106     fi
 107     return $ret
 108 }
 109 cedit "$@"