添加sub-fonts-dir-auto.lua脚本

在播放目录下自动指定`sub-fonts-dir`要使用的字体目录fonts以实现加载特定字体目录。**注意**：mpv必于以包含pr mpv-player/mpv#9856 的版本编译方可使用此脚本


Former-commit-id: 70211cc

manager.json

@@ -14,6 +14,11 @@
     "whitelist":"blacklist%-extensions%.lua$",
     "dest":"~~/scripts"
   },
+  {
+    "git":"https://github.com/fbriere/mpv-scripts",
+    "whitelist":"sub%-fonts%-dir%-autos%.lua$",
+    "dest":"~~/scripts"
+  },
   {
     "git":"https://github.com/Ashyni/mpv-scripts",
     "whitelist":"dynamic%-crop%.lua$",

scripts/sub-fonts-dir-auto.lua

@@ -0,0 +1,124 @@
+--[[
+
+    Automatically look for a fonts directory to use with `sub-fonts-dir`.
+
+    This mpv Lua script will automatically use the `sub-fonts-dir` option (to
+    override the default `~~/fonts` location) if it find a `Fonts` directory
+    alongside the currently playing file.  (The name of the directory is
+    matched case-insensitively.)
+
+    **NOTE:** The `sub-fonts-dir` option has been submitted as part of [PR
+    #9856](https://github.com/mpv-player/mpv/pull/9856).  Until it is merged
+    upstream, you will have to download and compile the [mpv
+    source](https://github.com/mpv-player/mpv) yourself.
+
+
+    USAGE:
+
+    Simply drop this script in your scripts configuration directory (usually
+    `~/.config/mpv/scripts/`).
+
+
+    REQUIREMENTS:
+
+    This script requires a version of mpv that includes the `sub-fonts-dir`
+    option.
+
+
+    NOTES:
+
+    - Any `--sub-fonts-dir` option passed on the command-line will override
+    this script.
+
+    - When going through a playlist, `sub-fonts-dir` will be dynamically
+    updated for each individual file.
+
+    - This script will output some additional information on higher verbosity
+    levels (`-v`).  To increase the verbosity for this script only, use
+    `--msg-level=sub_fonts_dir_auto=v` (or `=debug` for more output).
+
+
+    AUTHOR:
+
+    Frédéric Brière ([email protected])
+
+    Licensed under the GNU General Public License, version 2 or later.
+
+--]]
+
+
+local utils = require 'mp.utils'
+local msg = require 'mp.msg'
+-- msg.trace() was added in 0.28.0 -- define it ourselves if it's missing
+if msg.trace == nil then
+    msg.trace = function(...) return mp.log("trace", ...) end
+end
+
+
+-- Directory name we are looking for (case-insensitive)
+local FONTS_DIR_NAME = "Fonts"
+-- Option name that we want to set
+local OPTION_NAME = "sub-fonts-dir"
+-- Make sure this option is available in this version of mpv
+do
+    local _, err = mp.get_property(OPTION_NAME)
+    if err then
+        msg.error(string.format("This version of mpv does not support the %s option", OPTION_NAME))
+        return
+    end
+end
+
+
+-- Whether a path is a directory
+local function isdir(path)
+    return utils.readdir(path .. "/.") ~= nil
+end
+
+-- Set an option's value for this file, without overriding the command-line
+local function set_option(name, value)
+    if not mp.get_property_bool(string.format("option-info/%s/set-from-commandline", name)) then
+        msg.verbose(string.format("Setting %s to %q", name, value))
+        mp.set_property(string.format("file-local-options/%s", name), value)
+    else
+        msg.debug(string.format("Option %s was set on command-line -- leaving it as-is", name))
+    end
+end
+
+-- Find a "Fonts" directory under a single path
+local function find_fonts_dir(path)
+    local entries = utils.readdir(path, "dirs")
+    if entries == nil then
+        -- mpv will throw an error message soon enough, no need to intervene
+        return
+    end
+    msg.trace(string.format("Iterating over directories under %q", path))
+    for _, entry in ipairs(entries) do
+        msg.trace("Candidate directory:", entry)
+        if entry:lower() == FONTS_DIR_NAME:lower() then
+            msg.trace("Match found")
+            return utils.join_path(path, entry)
+        end
+    end
+    msg.trace("No match found")
+end
+
+-- "on_load" hook callback for when a file is about to be loaded.
+local function on_load()
+    local path = mp.get_property("path")
+    if isdir(path) then
+        msg.debug("Playing 'file' is actually a directory -- skipping")
+        return
+    end
+
+    local path_dir = utils.split_path(path)
+    -- Cosmetic nitpicking: That trailing "/" just looks annoying to me
+    path_dir = path_dir:gsub("(.)/+$", "%1")
+
+    msg.debug(string.format("Searching %q for fonts directory", path_dir))
+    local fonts_dir = find_fonts_dir(path_dir)
+    if fonts_dir then
+        msg.debug("Found fonts directory:", fonts_dir)
+        set_option(OPTION_NAME, fonts_dir)
+    end
+end
+mp.add_hook("on_load", 50, on_load)