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LICENSE

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+MIT License
+
+Copyright (c) 2024 keb
+
+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.

README.md

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+# convert-furigana
+
+## What is it?
+
+There are a few extensions that add [furigana](https://en.wikipedia.org/wiki/Furigana) support to Markdown. I use [Obsidian](https://obsidian.md/), and therefore its furigana extension: [obsidian-markdown-furigana](https://github.com/steven-kraft/obsidian-markdown-furigana). It works well, but by nature is limited by being used within Obsidian.
+
+For that purpose, this python script converts this specific syntax to common, all-platforms HTML ruby tags.
+
+## Process
+
+This specific extension syntax is as following:
+```
+{漢字|かんじ}
+{漢字|かん|じ}
+```
+
+When processed by this script, the result is:
+```
+<ruby>漢字<rt>かんじ</rt></ruby>
+<ruby>漢<rt>かん</rt>字<rt>じ</rt></ruby>
+```
+
+Which leads visually from, by default markdown standards:
+
+> {漢字|かんじ}
+>
+> {漢字|かん|じ}
+
+to common HTML ruby syntax:
+
+> <ruby>漢字<rt>かんじ</rt></ruby>
+>
+> <ruby>漢<rt>かん</rt>字<rt>じ</rt></ruby>
+
+## Limitations
+
+This has been made for my personal use, which is only kanjis with kanas as furigana. The regexp used do not recognize other inputs. But you can modify them easily for your use if needed.
+
+## Usage
+
+Usage: `python3 convert-furigana.py [root folder]`
+
+Note: Please be careful, this software applies modifications recursively!

examples/furigana1.md

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+{僕|ボク}の{筆記|ひっ|き}
+
+### ～によるN
+
+* テレビによる{報道|ほうどう}
+* この{地震|じ|しん}による{津波|つ|なみ}の{心配|しんぱい}はありません。

examples/subfolder/furigana2.md

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+## ふりがなテスト
+
+{漢字|かんじ}
+
+{漢字|かん|じ}
+
+{漢字|カン|ジ}

program/convert-furigana.py

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+import sys
+import os
+from glob import glob
+import re
+
+### Patterns ###
+
+# https://www.reddit.com/r/learnpython/comments/h0tsaa/regex_expression_for_japanese_extracting/
+re_brace = '{(.+?)}'
+re_kanji = '([㐀-䶵一-鿋豈-頻]+)'
+re_kana = '([ぁ-ゟ゠-ヿ]+)'
+
+### Open file ###
+
+def open_file(filename):
+    with open(filename, 'r', encoding='utf-8-sig') as file:
+        filedata = file.read()
+        return filedata
+
+### Replace ###
+
+def write_ruby_simple(kanji, kana):
+    return f"<ruby>{kanji}<rt>{kana}</rt></ruby>"
+
+def write_ruby_multiple(kanji, kanas):
+    result = f"<ruby>"
+    for idx, kana in enumerate(kanas):
+        result += f"{kanji[idx]}"
+        result += f"<rt>{kana}</rt>"
+    result += f"</ruby>"
+    return result
+
+def convert_to_ruby(content):
+    kanji = re.search(re_kanji, content.group())
+    kana = re.findall(re_kana, content.group())
+
+    if (len(kana) == 1):
+        return write_ruby_simple(kanji.group(), kana[0])
+    else:
+        return write_ruby_multiple(kanji.group(), kana)
+
+def convert_pattern(text):
+    res_text = re.sub(re_brace, convert_to_ruby, text)
+    return res_text
+
+### Write to file ###
+
+def write_file(filename, text):
+    with open(filename, 'w', encoding='utf-8-sig') as file:
+        file.write(text)
+
+
+### Execution ###
+
+file_list = []
+
+if len(sys.argv) > 1:
+    path = sys.argv[1]
+    for filename in glob(path + "/**/*.md", recursive=True):
+        if (os.path.isfile(filename)):
+            file_list.append(filename)
+else:
+    print(f"Usage: python3 {sys.argv[0]} [root folder]")
+    print(f"Note: Please be careful, this software applies modifications recursively!")
+
+for filename in file_list:
+    print(f"Found file {filename}, processing...", end='')
+    data = open_file(filename)
+    text = convert_pattern(data)
+    write_file(filename, text)
+    print(f" done!")