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1 files changed, 196 insertions, 0 deletions

diff --git a/config/mpv/scripts/subs2srsa/subtitles/secondary_sid.lua b/config/mpv/scripts/subs2srsa/subtitles/secondary_sid.lua
new file mode 100644
index 0000000..21576e8
--- /dev/null
+++ b/config/mpv/scripts/subs2srsa/subtitles/secondary_sid.lua
@@ -0,0 +1,196 @@
+--[[
+Copyright: Ren Tatsumoto and contributors
+License: GNU GPL, version 3 or later; http://www.gnu.org/licenses/gpl.html
+
+This module automatically finds and sets secondary sid if it's not already set.
+Secondary sid will be shown when mouse is moved to the top part of the mpv window.
+]]
+
+local mp = require('mp')
+local h = require('helpers')
+
+local self = {
+    visibility = 'auto',
+    visibility_states = { auto = true, never = true, always = true, },
+}
+
+local function is_accepted_language(sub_lang)
+    -- for missing keys compares nil to true
+    return self.accepted_languages[sub_lang] == true
+end
+
+local function is_selected_language(track, active_track)
+    return track.id == mp.get_property_native('sid') or (active_track and active_track.lang == track.lang)
+end
+
+local function is_full(track)
+    return h.str_contains(track.title, 'full')
+end
+
+local function is_garbage(track)
+    for _, keyword in pairs({ 'song', 'sign', 'caption', 'commentary' }) do
+        if h.str_contains(track.title, keyword) then
+            return true
+        end
+    end
+    return false
+end
+
+local function prioritize_full_subs(tracks_list)
+    return table.sort(tracks_list, function(first, second)
+        return (is_full(first) and not is_full(second)) or (is_garbage(second) and not is_garbage(first))
+    end)
+end
+
+local function find_best_secondary_sid()
+    local active_track = h.get_active_track('sub')
+    local sub_tracks = h.get_loaded_tracks('sub')
+    prioritize_full_subs(sub_tracks)
+    for _, track in ipairs(sub_tracks) do
+        if is_accepted_language(track.lang) and not is_selected_language(track, active_track) then
+            return track.id
+        end
+    end
+    return nil
+end
+
+local function window_height()
+    return mp.get_property_native('osd-dimensions/h')
+end
+
+local function get_accepted_sub_langs()
+    local languages = {}
+    for lang in self.config.secondary_sub_lang:gmatch('[a-zA-Z-]+') do
+        languages[lang] = true
+    end
+    return languages
+end
+
+local function on_mouse_move(_, state)
+    -- state = {x=int,y=int, hover=true|false, }
+    if mp.get_property_native('secondary-sid') and self.visibility == 'auto' and state ~= nil then
+        mp.set_property_bool(
+                'secondary-sub-visibility',
+                state.hover and (state.y / window_height()) < self.config.secondary_sub_area
+        )
+    end
+end
+
+local function on_file_loaded()
+    -- If secondary sid is not already set, try to find and set it.
+    local secondary_sid = mp.get_property_native('secondary-sid')
+    if secondary_sid == false and self.config.secondary_sub_auto_load == true then
+        secondary_sid = find_best_secondary_sid()
+        if secondary_sid ~= nil then
+            mp.set_property_native('secondary-sid', secondary_sid)
+        end
+    end
+end
+
+local function update_visibility()
+    mp.set_property_bool('secondary-sub-visibility', self.visibility == 'always')
+end
+
+local function init(config)
+    self.config = config
+    self.visibility = config.secondary_sub_visibility
+    self.accepted_languages = get_accepted_sub_langs()
+    mp.register_event('file-loaded', on_file_loaded)
+    if config.secondary_sub_area > 0 then
+        mp.observe_property('mouse-pos', 'native', on_mouse_move)
+    end
+    update_visibility()
+end
+
+local function change_visibility()
+    while true do
+        self.visibility = next(self.visibility_states, self.visibility)
+        if self.visibility ~= nil then
+            break
+        end
+    end
+    update_visibility()
+    h.notify("Secondary sid visibility: " .. self.visibility)
+end
+
+local function compare_by_preference_then_id(track1, track2)
+    if is_accepted_language(track1.lang) and not is_accepted_language(track2.lang) then
+        return true
+    elseif not is_accepted_language(track1.lang) and is_accepted_language(track2.lang) then
+        return false
+    else
+        return (track1.id < track2.id)
+    end
+end
+
+local function split_before_after(previous_tracks, next_tracks, all_tracks, current_track_id)
+    -- works like take_while() and drop_while() combined
+    local prev = true
+    for _, track in ipairs(all_tracks) do
+        if prev == true and track.id == current_track_id then
+            prev = false
+        end
+        if track.id ~= current_track_id then
+            if prev then
+                table.insert(previous_tracks, track)
+            else
+                table.insert(next_tracks, track)
+            end
+        end
+    end
+end
+
+local function not_primary_sid(track)
+    return mp.get_property_native('sid') ~= track.id
+end
+
+local function find_new_secondary_sub(direction)
+    local subtitle_tracks = h.filter(h.get_loaded_tracks('sub'), not_primary_sid)
+    table.sort(subtitle_tracks, compare_by_preference_then_id)
+
+    local secondary_sid = mp.get_property_native('secondary-sid')
+    local new_secondary_sub = { id = false, title = "removed" }
+
+    if #subtitle_tracks > 0 then
+        if not secondary_sid then
+            new_secondary_sub = (direction == 'prev') and subtitle_tracks[#subtitle_tracks] or subtitle_tracks[1]
+        else
+            local previous_tracks = {}
+            local next_tracks = {}
+            split_before_after(previous_tracks, next_tracks, subtitle_tracks, secondary_sid)
+            if direction == 'prev' and #previous_tracks > 0 then
+                new_secondary_sub = previous_tracks[#previous_tracks]
+            elseif direction == 'next' and #next_tracks > 0 then
+                new_secondary_sub = next_tracks[1]
+            end
+        end
+    end
+    return new_secondary_sub
+end
+
+local function switch_secondary_sid(direction)
+    local new_secondary_sub = find_new_secondary_sub(direction)
+
+    mp.set_property_native('secondary-sid', new_secondary_sub.id)
+    if new_secondary_sub.id == false then
+        h.notify("Removed secondary sid.")
+    else
+        h.notify(string.format(
+                "Secondary #%d: %s (%s)",
+                new_secondary_sub.id,
+                new_secondary_sub.title or "No title",
+                new_secondary_sub.lang or "Unknown"
+        ))
+    end
+end
+
+return {
+    init = init,
+    change_visibility = change_visibility,
+    select_previous = function()
+        switch_secondary_sid('prev')
+    end,
+    select_next = function()
+        switch_secondary_sid('next')
+    end,
+}