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1 files changed, 89 insertions, 0 deletions

diff --git a/config/mpv/scripts/subs2srsa/utils/filename_factory.lua b/config/mpv/scripts/subs2srsa/utils/filename_factory.lua
new file mode 100644
index 0000000..a794fc7
--- /dev/null
+++ b/config/mpv/scripts/subs2srsa/utils/filename_factory.lua
@@ -0,0 +1,89 @@
+--[[
+Copyright: Ren Tatsumoto and contributors
+License: GNU GPL, version 3 or later; http://www.gnu.org/licenses/gpl.html
+
+Creates image and audio filenames compatible with Anki.
+]]
+
+local mp = require('mp')
+local h = require('helpers')
+
+local filename
+
+local anki_compatible_length = (function()
+    -- Anki forcibly mutilates all filenames longer than 119 bytes when you run `Tools->Check Media...`.
+    local allowed_bytes = 119
+    local timestamp_bytes = #'_99h99m99s999ms-99h99m99s999ms.webp'
+
+    return function(str, timestamp)
+        -- if timestamp provided, recalculate limit_bytes
+        local limit_bytes = allowed_bytes - (timestamp and #timestamp or timestamp_bytes)
+
+        if #str <= limit_bytes then
+            return str
+        end
+
+        local bytes_per_char = h.contains_non_latin_letters(str) and #'車' or #'z'
+        local limit_chars = math.floor(limit_bytes / bytes_per_char)
+
+        if limit_chars == limit_bytes then
+            return str:sub(1, limit_bytes)
+        end
+
+        local ret = h.subprocess {
+            'awk',
+            '-v', string.format('str=%s', str),
+            '-v', string.format('limit=%d', limit_chars),
+            'BEGIN{print substr(str, 1, limit); exit}'
+        }
+
+        if ret.status == 0 then
+            ret.stdout = h.remove_newlines(ret.stdout)
+            ret.stdout = h.remove_leading_trailing_spaces(ret.stdout)
+            return ret.stdout
+        else
+            return 'subs2srs_' .. os.time()
+        end
+    end
+end)()
+
+local make_media_filename = function()
+    filename = mp.get_property("filename") -- filename without path
+    filename = h.remove_extension(filename)
+    filename = h.remove_filename_text_in_parentheses(filename)
+    filename = h.remove_text_in_brackets(filename)
+    filename = h.remove_special_characters(filename)
+end
+
+local function timestamp_range(start_timestamp, end_timestamp, extension)
+    -- Generates a filename suffix of the form: _00h00m00s000ms-99h99m99s999ms.extension
+    -- Extension must already contain the dot.
+    return string.format(
+            '_%s_%s%s',
+            h.human_readable_time(start_timestamp),
+            h.human_readable_time(end_timestamp),
+            extension
+    )
+end
+
+local function timestamp_static(timestamp, extension)
+    -- Generates a filename suffix of the form: _00h00m00s000ms.extension
+    -- Extension must already contain the dot.
+    return string.format(
+            '_%s%s',
+            h.human_readable_time(timestamp),
+            extension
+    )
+end
+
+local make_filename = function(...)
+    local args = {...}
+    local timestamp = #args < 3 and timestamp_static(...) or timestamp_range(...)
+    return string.lower(anki_compatible_length(filename, timestamp) .. timestamp)
+end
+
+mp.register_event("file-loaded", make_media_filename)
+
+return {
+    make_filename = make_filename,
+}