make script generic and rename it

.gitignore

@@ -1 +1,2 @@
 /webp/
+/png/

generate_raster_images.zsh

@@ -0,0 +1,24 @@
+#!/usr/bin/env zsh
+# Generates trimmed raster images images from SVGs in svg/.
+# Argument 1 is the file extension, default is webp.
+# Argument 2 is the size, default is to use the SVG size.
+
+setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
+
+if ! type convert &> /dev/null; then
+    print -u2 "'convert' from imagemagick not found"
+    return 1
+fi
+
+local ext=webp
+[[ ${ARGC} > 0 ]] && ext=${1}
+local size=-1
+[[ ${ARGC} > 1 ]] && size=${2}
+
+print "generating ${ext} images in ${PWD}/${ext} …"
+mkdir -p ${ext}
+for svg in svg/*.svg; do
+    local target=${svg##*/}
+    target=${ext}/${target%.*}.${ext}
+    convert ${svg} -trim -resize ${size} -quality 100 -verbose ${target}
+done

generate_webp.zsh

@@ -1,21 +0,0 @@
-#!/usr/bin/env zsh
-# Generates trimmed WebP images from SVGs in svg/.
-# First argument is the size, default is to use the SVG size.
-
-setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
-
-if ! type convert &> /dev/null; then
-    print -u2 "'convert' from imagemagick not found"
-    return 1
-fi
-
-local size=-1
-[[ ${ARGC} > 0 ]] && size=${1}
-
-print "generating WebP images in ${PWD}/webp …"
-mkdir -p webp
-for svg in svg/*.svg; do
-    local webp=${svg##*/}
-    webp=webp/${webp%.*}.webp
-    convert ${svg} -trim -resize ${size} -quality 100 -verbose ${webp}
-done