feat: add smart-filter and jump-to-char plugins

jump-to-char.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.

jump-to-char.yazi/README.md

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+# jump-to-char.yazi
+
+TODO: add description
+
+## Installation
+
+```sh
+ya pack -a yazi-rs/plugins#jump-to-char
+```
+
+## Usage
+
+Add this to your `~/.config/yazi/keymap.toml`:
+
+```toml
+[[manager.prepend_keymap]]
+on = [ "f" ]
+run = "plugin jump-to-char"
+desc = "Jump to char"
+```
+
+Make sure the <kbd>f</kbd> key is not used elsewhere.

jump-to-char.yazi/init.lua

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+local AVAILABLE_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+local changed = ya.sync(function(st, new)
+	local b = st.last ~= new
+	st.last = new
+	return b
+end)
+
+return {
+	entry = function()
+		local cands = {}
+		for i = 1, #AVAILABLE_CHARS do
+			cands[#cands + 1] = { on = AVAILABLE_CHARS:sub(i, i) }
+		end
+
+		local idx = ya.which { cands = cands, silent = true }
+		if not idx then
+			return
+		end
+
+		if changed(cands[idx].on) then
+			ya.manager_emit("find_do", { insensitive = true, "^" .. cands[idx].on })
+		else
+			ya.manager_emit("find_arrow", {})
+		end
+	end,
+}