chore(user/zeropad.sh):Update comment

[BK-2020-03.git] / user / zeropad.sh

diff --git a/user/zeropad.sh b/user/zeropad.sh
index 369d8c06ca771433319a22e6150520084a601415..b9b032b1465f750528dc72edccfe6878100109e0 100755 (executable)
--- a/user/zeropad.sh
+++ b/user/zeropad.sh
@@ -1,12 +1,31 @@
 #!/bin/bash
 # Desc: Zero-pad working dir files with initial digits for sorting
-# Usage: zeropad.sh
-# Version: 0.0.4
+# Usage: zeropad.sh [str fext]
+# Example: zeropad.sh;
+#          zeropad.sh ".jpg";
+# Input: arg1  str  file extension of files to apply changes to
+# Version: 0.1.1
+
+declare fext; # file extension
 
 list_files() {
-    find . -mindepth 1 -maxdepth 1 -type f -exec basename '{}' \; ;
-};
+    # Desc: Lists working directory file basenames
+    # Usage: list_files
+    # Input: fext  var  file extension
+    # Output: stdout  a line-delimited list of file names
+    if [[ -z "$fext" ]]; then
+        find . -mindepth 1 -maxdepth 1 -type f -exec basename '{}' \; ;
+    else
+        find . -mindepth 1 -maxdepth 1 -type f -exec basename '{}' \; \
+            | grep -E -- "${fext}$" ;
+    fi;
+}; # list pwd file basenames
 main () {
+    # Read file extension if provided
+    if [[ -n "$1" ]]; then
+        fext="$1";
+    fi;
+
     # Find the maximum number of leading digits in the filenames of working dir
     max_digits="$(list_files | sed -e 's/[^0-9].*//' | awk '{ if(length > L) L=length } END { print L }')";
     # declare -p max_digits; # debug
@@ -23,15 +42,13 @@ main () {
         # Construct the new filename
         new_file="${padded_digits}${file#${digits}}";
         # Rename the file
+        if [[ "$file" == "$new_file" ]]; then continue; fi;
         mv -n "$file" "$new_file"
         # declare -p file new_file; # debug
     done < <(list_files);
-};
+}; # main program
 
 main "$@";
 
-
-
-
 # Author: Steven Baltakatei Sandoval
 # License: GPLv3+