gallery: improve the README

To cater to Debian.

README.adoc

@@ -8,10 +8,32 @@ and query your collections in various ways.
 All media is content-addressed by its SHA-1 hash value, and at your option
 also perceptually hashed.  Duplicate search is an essential feature.
 
-Prerequisites: Go, ImageMagick v7, xdg-utils
-
 The gallery is designed for simplicity, and easy interoperability.
 sqlite3, curl, jq, and the filesystem will take you a long way.
 
+Prerequisites: Go, ImageMagick, xdg-utils
+
+ImageMagick v7 is preferred, it doesn't shoot out of memory as often.
+
+Getting it to work
+------------------
+ # apt install build-essential git golang imagemagick xdg-utils
+ $ git clone https://git.janouch.name/p/gallery.git
+ $ cd gallery
+ $ make
+ $ ./gallery init G
+ $ ./gallery sync G ~/Pictures
+ $ ./gallery thumbnail G             # parallelized, with memory limits
+ $ ./gallery -threads 1 thumbnail G  # one thread only gets more memory
+ $ ./gallery dhash G
+ $ ./gallery web G :8080
+
 The intended mode of use is running daily automated sync/thumbnail/dhash/tag
-batches in a cron job, or from a system timer.  See _test.sh_ for usage hints.
+batches in a cron job, or from a systemd timer.
+
+The _web_ command needs to see the _public_ directory,
+and is friendly to reverse proxying.
+
+Demo
+----
+https://holedigging.club/gallery/

main.go

@@ -1377,7 +1377,7 @@ func syncIsImage(path string) (bool, error) {
 }
 
 func syncPingImage(path string) (int, int, error) {
-	out, err := exec.Command("magick", "identify", "-limit", "thread", "1",
+	out, err := exec.Command("identify", "-limit", "thread", "1",
 		"-ping", "-format", "%w %h", path+"[0]").Output()
 	if err != nil {
 		return 0, 0, err
@@ -2321,7 +2321,7 @@ func makeThumbnail(load bool, pathImage, pathThumb string) (
 	//
 	// TODO: See if we can optimize resulting WebP animations.
 	// (Do -layers optimize* apply to this format at all?)
-	cmd := exec.Command("magick", "-limit", "thread", "1",
+	cmd := exec.Command("convert", "-limit", "thread", "1",
 
 		// Do not invite the OOM killer, a particularly unpleasant guest.
 		"-limit", "memory", memoryLimit,

public/gallery.js

@@ -10,7 +10,7 @@ function call(method, params) {
 	callActive++
 	return m.request({
 		method: "POST",
-		url: `/api/${method}`,
+		url: `api/${method}`,
 		body: params,
 	}).then(result => {
 		callActive--
@@ -98,7 +98,7 @@ let Thumbnail = {
 		if (!e.thumbW || !e.thumbH)
 			return m('.thumbnail.missing', {...vnode.attrs, info: null})
 		return m('img.thumbnail', {...vnode.attrs, info: null,
-			src: `/thumb/${e.sha1}`, width: e.thumbW, height: e.thumbH,
+			src: `thumb/${e.sha1}`, width: e.thumbW, height: e.thumbH,
 			loading})
 	},
 }
@@ -494,7 +494,7 @@ let View = {
 	view(vnode) {
 		const view = m('.view', [
 			ViewModel.sha1 !== undefined
-				? m('img', {src: `/image/${ViewModel.sha1}`,
+				? m('img', {src: `image/${ViewModel.sha1}`,
 					width: ViewModel.width, height: ViewModel.height})
 				: "No image.",
 		])