user/triml.sh

   1 #!/usr/bin/env bash
   2 # Desc: Rename files to remove common prefix
   3 # Usage: triml.sh [FILE] ([FILE]…)
   4 # Example: triml.sh ./*.txt
   5 # Version: 0.0.1
   6
   7 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   8 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   9 must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  10 get_prefix() {
  11     # Desc: Iteratively identify common prefix
  12     # Input: "$@"  arguments
  13     # Output: stdout
  14     local prefix="$1"; # start with first arg
  15     shift; # don't compare first to first
  16     for arg in "$@"; do
  17         while [[ "$arg" != "$prefix"* ]]; do
  18             prefix="${prefix%?}"; # trim end of prefix if match
  19         done;
  20     done;
  21     printf "%s" "$prefix";
  22 }; # Get common prefix of arguments
  23 show_usage() {
  24     # Desc: Display script usage information
  25     # Usage: show_usage
  26     # Version 0.0.2
  27     # Input: none
  28     # Output: stdout
  29     # Depends: GNU-coreutils 8.30 (cat)
  30     cat <<'EOF'
  31     USAGE:
  32         triml.sh FILE [FILE…]
  33
  34     OPTIONS:
  35         (none)
  36
  37     EXAMPLE:
  38       triml.sh
  39       triml.sh ./*.txt
  40 EOF
  41 } # Display information on how to use this script.
  42 prompt_continue() {
  43     # Desc: Prompt user to go approve/disapprove or list files to be moved.
  44     while true; do
  45         read -rp "Rename ${#args[@]} files? (y/N or l/list): " choice;
  46         case "${choice,,}" in
  47             y|yes)
  48                 yell "STATUS:Renaming...";
  49                 return 0;
  50                 ;;
  51             l|list)
  52                 for i in "${!args[@]}"; do
  53                     yell "Rename: ${args[i]} -> ${args_defront[i]}";
  54                 done;
  55                 ;;
  56             n|no)
  57                 die "FATAL:Operation aborted.";
  58                 ;;
  59             *)
  60                 yell "Invalid option.";
  61         esac;
  62     done;
  63 }; # prompt user to continue operation
  64 main () {
  65     declare -a args args_defront;
  66     declare prefix;
  67     declare path_dir name_file name_file_new;
  68
  69     # Check if no arguments are passed
  70     if [[ "$#" -le 0 ]]; then
  71         ## Act on working dir files
  72         mapfile -t args < <(find . -mindepth 1 -maxdepth 1 -type f);
  73     else
  74         ## Act on argument-specified file paths
  75         args=("$@");
  76     fi;
  77
  78     # Check that all args are file paths
  79     for arg in "${args[@]}"; do
  80         if [[ ! -f "$arg" ]]; then
  81             show_usage;
  82             die "FATAL:Not a file:${arg}"; fi;
  83     done;
  84
  85     # Get common prefix of all file basenames
  86     ## Assemble directory paths and file name arrays
  87     for i in "${!args[@]}"; do
  88         #args_path[i]="$(dirname "${args[i]}")";
  89         args_file[i]="$(basename "${args[i]}")";
  90     done;
  91     prefix="$(get_prefix "${args_file[@]}")";
  92     #declare -p args prefix; # debug
  93     if [[ "${#prefix}" -le 0 ]]; then
  94        #declare -p prefix; # debug
  95        die "FATAL:No file prefix found."; fi;
  96
  97     # Assemble paths with defronted basenames
  98     for i in "${!args[@]}"; do
  99         path_dir="$(dirname "${args[i]}")";
 100         name_file="$(basename "${args[i]}")";
 101         name_file_new="${name_file#"${prefix}"}";
 102         args_defront[i]="${path_dir}/${name_file_new}";
 103     done;
 104
 105     # Throw rename warning
 106     must prompt_continue;
 107
 108     # Rename files to defront prefix
 109     for i in "${!args[@]}"; do
 110         if mv -n "${args[i]}" "${args_defront[i]}"; then
 111             yell "STATUS:Moved ${args[i]} to ${args_defront[i]}";
 112         else
 113             die "FATAL:Failed to move ${args[i]} to ${args_defront[i]}";
 114         fi;
 115     done;
 116 };
 117 main "$@";
 118
 119 # Author: Steven Baltakatei Sandoval
 120 # License: GPLv3+