Create wrapper for 'convert'

.local/bin/converta

@@ -0,0 +1,87 @@
+#!/bin/bash
+
+# converta
+#
+# Run `convert` over a directory and filter files by a particular pattern
+#
+# Example - Convert all ARW files in ~/Pictures to PNG:
+# ./converta -d ~/Pictures -p '.*.ARW' -e PNG
+
+script_name="$(basename -- "$0")"
+force=false
+
+function usage() {
+    echo "Usage: $script_name [OPTIONS]"
+    echo
+    echo "Options:"
+    echo "  -h              Display help"
+    echo "  -d [DIRECTORY]  Directory of files to process"
+    echo "  -o [EXTENSION]  Target extension"
+    echo "  -l [LEVELS]     Limit the amount of directory levels to process"
+    echo "  -p [PATTERN]    Extended regular expression pattern for filtering files"
+    echo
+    echo "Example:"
+    echo "  $script_name -d ~/Pictures -o JPG -l 2 -p '.*.ARW$'"
+}
+
+while getopts ":d:o:l:p:fh" arg; do
+    case $arg in
+    d) directory=$OPTARG ;;
+    o) extension=$OPTARG ;;
+    l) levels="-maxdepth $OPTARG" ;;
+    p) pattern=$OPTARG ;;
+    f) force=true ;;
+    h)
+        usage
+        exit 0
+        ;;
+    :)
+        echo "$script_name: Must supply an argument to -$OPTARG." >&2
+        usage
+        exit 1
+        ;;
+    ?)
+        echo "Invalid option: -${OPTARG}."
+        echo
+        usage
+        exit 2
+        ;;
+    esac
+done
+
+[ -z "$directory" ] && usage && exit 1
+[ -z "$extension" ] && usage && exit 1
+[ -z "$pattern" ] && usage && exit 1
+
+# Kill ourself with SIGINT upon receiving SIGINT:
+trap '
+  trap - INT # restore default INT handler
+  kill -s INT "$$"
+' INT
+
+echo "Will $($force && echo "forcibly ")convert files in '$directory' that match '$pattern' to '$extension'"
+
+# shellcheck disable=SC2086
+while read -r input_path; do
+    file="$(basename "$input_path")"
+    output_path="${input_path%.*}.$extension"
+    addl_str=""
+    cvt=true
+    grep -Eq "$pattern" <<<"$file" || continue
+
+    if [ -f "$output_path" ]; then
+        if [ "$(wc -c <"$output_path")" -eq 0 ]; then
+            addl_str=" (exists, 0 bytes)"
+            rm "$output_path"
+        elif ! $force; then
+            addl_str=" (already converted)"
+            cvt=false
+        else
+            addl_str=" (overwriting)"
+            rm "$output_path"
+        fi
+    fi
+
+    echo "$input_path -> $output_path$addl_str"
+    $cvt && convert "$input_path" "$output_path"
+done <<<"$(find "$directory" $levels -type f)"