feat: new plugin zoom.yazi to zoom in or out of the preview image

zoom.yazi/main.lua

@@ -0,0 +1,77 @@
+--- @since 25.6.11
+
+local get = ya.sync(function(st)
+	local h = cx.active.current.hovered
+	if not h then
+		return
+	end
+
+	if st.last ~= h:hash() then
+		st.level, st.last = 0, h:hash()
+	end
+
+	return {
+		url = h.url,
+		mime = h:mime() or "",
+		level = st.level,
+	}
+end)
+
+local save = ya.sync(function(st, level) st.level = level end)
+
+local function fail(...) return ya.notify { title = "Zoom", content = string.format(...), timeout = 5, level = "error" } end
+
+local function canvas()
+	local cw, ch = rt.term.cell_size()
+	if not cw then
+		return rt.preview.max_width, rt.preview.max_height
+	end
+
+	local area = ui.area("preview")
+	return math.min(rt.preview.max_width, math.floor(area.w * cw)),
+		math.min(rt.preview.max_height, math.floor(area.h * ch))
+end
+
+local function entry(_, job)
+	local st = get(job.args[1])
+	if not st then
+		return
+	end
+
+	local info, err = ya.image_info(st.url)
+	if not info then
+		return fail("Failed to get image info: %s", err)
+	end
+
+	local motion = tonumber(job.args[1]) or 0
+	st.level = ya.clamp(-10, st.level + motion, 10)
+
+	local max_w, max_h = canvas()
+	local min_w, min_h = math.min(max_w, info.w), math.min(max_h, info.h)
+	local new_w = min_w + math.floor(min_w * st.level * 0.1)
+	local new_h = min_h + math.floor(min_h * st.level * 0.1)
+	if new_w > max_w or new_h > max_h then
+		return -- Image larger than available preview area after zooming
+	end
+
+	local tmp = os.tmpname()
+	-- stylua: ignore
+	local status, err = Command("magick"):arg {
+		tostring(st.url),
+		"-auto-orient", "-strip",
+		"-resize", string.format("%dx%d", new_w, new_h),
+		"-quality", rt.preview.image_quality,
+		string.format("JPG:%s", tmp),
+	}:status()
+
+	if not status then
+		return fail("Failed to run `magick` command: %s", err)
+	elseif not status.success then
+		return fail("`magick` command exited with error code %d", status.code)
+	end
+
+	save(st.level)
+	ya.image_show(Url(tmp), ui.area("preview"))
+end
+
+return { entry = entry }