feat: graphicsmagick support

compress

@@ -18,14 +18,21 @@ function compress() {(
     newdir="${PWD%/*}/$(basename "$dir")_1080p"
     mkdir -p "$newdir"
     for file in *; do
-        identify "$file" 2> /dev/null >&2 \
-            && convert -resize x1080 "$file" "$newdir/$file" &
+        "${IDENTIFY[@]}" "$file" 2> /dev/null >&2 \
+            && "${CONVERT[@]}" -resize x1080 "$file" "$newdir/$file" &
         wait_queue
         nb="$(printf '%s\n' "$newdir"/* | wc -l)"
         echo "$((nb * 100 / total))"
     done
 )}
 
+IDENTIFY=(identify)
+CONVERT=(convert)
+if command -v gm > /dev/null; then
+    IDENTIFY=(gm "${IDENTIFY[@]}")
+    CONVERT=(gm "${CONVERT[@]}")
+fi
+
 if [ -z "$1" ]; then
     set "$(zenity --file-selection --multiple --directory --separator='
 ')" > /dev/null

test.sh

@@ -1,7 +1,12 @@
 #!/bin/bash -e
 
+CONVERT=(convert)
+if command -v gm > /dev/null; then
+    CONVERT=(gm "${CONVERT[@]}")
+fi
+
 mkdir -p test test_1080p
 
-gm convert -size 3840x2160 xc:black test/000.png
+"${CONVERT[@]}" -size 3840x2160 xc:black test/000.png
 
 printf '%s\n' {001..127} | xargs -P0 -I'{}' cp test/000.png test/'{}'.png