Add webpautoconv.bash

webpautoconv.bash

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+
+# This is an old script of mine that I found again and updated
+# to also allow for watching directories recursively.
+# This script scans directories for webp files and converts them to
+# png files. It can also be run as a daemon that runs whenever a file
+# is created in the specified (sub)directories.
+
+launch_daemon() {
+    if [ -z "$(command -v inotifywait)" ]; then
+        >&2 echo "inotify-tools are required for daemon mode"
+        exit 1
+    fi
+    
+    if [ -n "$RECURSE" ]; then
+        scan_dirs=()
+        for scan_dir in $(find "$SCAN_DIR" -type d); do
+            scan_dirs+=("$scan_dir") 
+        done
+
+        inotifywait -mrq -e create --format %w%f "${scan_dirs[@]}" | while read -r FILE; do
+            convert_if_webp "$FILE"
+        done
+    else
+        inotifywait -mrq -e create --format %w%f "$SCAN_DIR" | while read -r FILE; do
+            convert_if_webp "$FILE"
+        done
+    fi
+
+}
+
+scan_dir() {
+    shopt -s globstar nullglob
+    if [ "$RECURSE" ]; then
+        for FILE in "$SCAN_DIR"**/**; do
+            convert_if_webp "$FILE"
+        done
+    else
+        for FILE in "$SCAN_DIR"/*; do
+            convert_if_webp "$FILE"
+        done
+    fi
+}
+
+convert_if_webp() {
+    if [ "$(file -b --mime-type "$FILE")" = "image/webp" ]; then
+        out_file="${1%.*}"
+        if [ -f "$out_file.png" ]; then
+            sha1="$(echo -n "$1" | sha1sum | awk '{print $1}')"
+            out_file+="-$sha1.png"
+        else
+            out_file+=".png"
+        fi
+        convert "$1" "$out_file"
+        echo "Converted $1 to $out_file"
+    fi
+}
+
+verify_option_with_argument() {
+    if [ -z "$2" ] || [ "${2:0:1}" = "-" ]; then
+        >&2 echo "Option $1 requires a parameter"
+        exit 1
+    fi
+}
+
+args() {
+    while [ -n "$1" ]; do
+        case "$1" in
+            "" | "-h" | "--help")
+                echo "unimplemented"
+                exit 0
+                ;;
+            "-c" | "--config")
+                verify_option_with_argument "$@"
+                CONF_FILE="$2"
+                shift 2
+                ;;
+            "-d" | "--directory")
+                verify_option_with_argument "$@"
+                SCAN_DIR="$2"
+                shift 2
+                ;;
+            "-w" | "--watch")
+                DAEMON="true"
+                shift
+                ;;
+            "-r" | "--recursive")
+                RECURSE="true"
+                shift
+                ;;
+        esac
+    done
+}
+
+config() {
+    [ -z "$CONF_FILE" ] && CONF_FILE="$HOME/.config/webpautoconv"
+
+    if [ -f "$CONF_FILE" ]; then
+        # shellcheck source=/dev/null
+        source "$CONF_FILE"
+    fi
+
+    # Default config options
+    [ -z "$SCAN_DIR" ] && SCAN_DIR="$HOME/Downloads"
+    [ -z "$DAEMON" ] && DAEMON="false"
+    [ -z "$RECURSE" ] && RECURSE="false"
+}
+
+main() {
+    config
+    args "$@"
+    scan_dir
+    if [ "$DAEMON" = "true" ]; then
+        launch_daemon
+    fi
+}
+
+main "$@"
+