feat: new mactag plugin

Co-authored-by: Anirudh Gupta <146579014+AnirudhG07@users.noreply.github.com>

mactag.yazi/LICENSE

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+MIT License
+
+Copyright (c) 2023 yazi-rs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

mactag.yazi/README.md

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+# mactag.yazi
+
+Bring macOS's awesome tagging feature to Yazi! The plugin it's only available for macOS just like the name says.
+
+Authors: [@AnirudhG07](https://github.com/AnirudhG07), and [@sxyazi](https://github.com/sxyazi)
+
+## Installation
+
+Install the plugin itself, and [jdberry/tag](https://github.com/jdberry/tag) used to tag files:
+
+```sh
+ya pack -a yazi-rs/plugins#mactag
+brew update && brew install tag
+```
+
+## Setup
+
+Add the following to your `~/.config/yazi/init.lua`:
+
+```lua
+require("mactag"):setup()
+```
+
+And register it as fetchers in your `~/.config/yazi/yazi.toml`:
+
+```toml
+[[plugin.prepend_fetchers]]
+id   = "mactag"
+name = "*"
+run  = "mactag"
+
+[[plugin.prepend_fetchers]]
+id   = "mactag"
+name = "*/"
+run  = "mactag"
+```
+
+## Usage
+
+This plugin also provides the functionality to add and remove tags. Add following keybindings to your `~/.config/yazi/keymap.toml` to enable it:
+
+```toml
+[[manager.prepend_keymap]]
+on   = [ "t", "r" ]
+run  = 'plugin mactag --args="add Red"'
+desc = "Tag selected files with red"
+
+[[manager.prepend_keymap]]
+on   = [ "t", "R" ]
+run  = 'plugin mactag --args="remove Red"'
+desc = "Remove red tag from selected files"
+```
+
+`Red` can be any tag name you like. To add/remove multiple tags at once, use a comma (`,`) to separate them, like `Red,Yellow`.

mactag.yazi/init.lua

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+local COLORS = { red = "red", yellow = "yellow", orange = "magenta", green = "green", blue = "blue" }
+
+local update = ya.sync(function(st, tags)
+	for path, tag in pairs(tags) do
+		st.tags[path] = #tag == 0 and nil or tag
+	end
+	ya.render()
+end)
+
+local selected_or_hovered = ya.sync(function()
+	local tab, urls = cx.active, {}
+	for _, u in pairs(tab.selected) do
+		urls[#urls + 1] = u
+	end
+	if #urls == 0 and tab.current.hovered then
+		urls[1] = tab.current.hovered.url
+	end
+	return urls
+end)
+
+local function setup(st)
+	st.tags = {}
+
+	Linemode:children_add(function(self)
+		local url = tostring(self._file.url)
+		local spans = {}
+		for _, tag in ipairs(st.tags[url] or {}) do
+			spans[#spans + 1] = ui.Span("⬤"):fg(COLORS[tag:lower()] or "reset")
+		end
+		return ui.Line(spans)
+	end, 500)
+end
+
+local function fetch(self)
+	local paths = {}
+	for _, file in ipairs(self.files) do
+		paths[#paths + 1] = tostring(file.url)
+	end
+
+	local output, err = Command("tag"):args(paths):stdout(Command.PIPED):output()
+	if not output then
+		return ya.err("Cannot spawn tag command, error code " .. tostring(err))
+	end
+
+	local i, tags = 1, {}
+	for line in output.stdout:gmatch("[^\r\n]+") do
+		if i > #paths then
+			break
+		end
+		tags[paths[i]] = tags[paths[i]] or {}
+
+		local joint = line:match("\t(.+)$") or ""
+		for s in joint:gmatch("[^,]+") do
+			table.insert(tags[paths[i]], s)
+		end
+		i = i + 1
+	end
+
+	update(tags)
+	return 1
+end
+
+local function entry(_, args)
+	assert(args[1] == "add" or args[1] == "remove", "Invalid action")
+	assert(args[2], "No tag specified")
+
+	local t = { args[1] == "remove" and "-r" or "-a", args[2] }
+	local files = {}
+	for _, url in ipairs(selected_or_hovered()) do
+		t[#t + 1] = tostring(url)
+		files[#files + 1] = { url = url }
+	end
+
+	local status = Command("tag"):args(t):status()
+	if status.success then
+		fetch { files = files }
+	end
+end
+
+return { setup = setup, fetch = fetch, entry = entry }