From 7a7e199f91a2edc148874727dcf0bcbda661661e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maximilian=20Ke=C3=9Fler?= <git@maximilian-kessler.de>
Date: Wed, 16 Feb 2022 14:47:29 +0100
Subject: [PATCH] first version of legacy converter

---
 constants.py              | 22 +++++++++++++
 latex_legacy_converter.py | 69 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 constants.py
 create mode 100644 latex_legacy_converter.py

diff --git a/constants.py b/constants.py
new file mode 100644
index 0000000..e0c710d
--- /dev/null
+++ b/constants.py
@@ -0,0 +1,22 @@
+ENVIRONMENTS = {
+    'prop': 'proposition',
+    'satz': 'theorem',
+    'kor': 'corollary',
+    'bsp': 'example',
+    'bem': 'remark',
+}
+
+ALPHABETS = {
+    'b': 'mathbb',
+    'c': 'mathcal',
+    'f': 'mathfrak',
+    '': 'mathbb',
+}
+
+DEPRECATED = {
+    r'\eps': r'\varepsilon',
+    r'\inv': r'^{-1}',
+    r'\se': r'\subseteq',
+    r'\sm': r'\setminus',
+    r'\st': r'^{\ast}',
+}
diff --git a/latex_legacy_converter.py b/latex_legacy_converter.py
new file mode 100644
index 0000000..d1c6e14
--- /dev/null
+++ b/latex_legacy_converter.py
@@ -0,0 +1,69 @@
+from constants import ENVIRONMENTS, ALPHABETS, DEPRECATED
+import re
+import pathlib
+from pathlib import Path
+
+
+def _migrate_lazy_math_alphabet(line: str, letters: str, short: str, alph: str):
+    for letter in letters:
+        while True:
+            m = re.search(r'\\%s%s(?=![a-zA-Z@])' % (short, letter), line)
+            if m is None:
+                break
+            else:
+                line = line[:m.start()] + r'\%s{%s}' % (alph, letter) + line[m.end():]
+    return line
+
+
+def migrate_lazy_math_alphabets(line: str) -> str:
+    for short, alph in ALPHABETS:
+        if short == '':
+            line = _migrate_lazy_math_alphabet(line, 'NZQRCFK', '', alph)
+        else:
+            line = _migrate_lazy_math_alphabet(line, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', short, alph)
+        if short == 'f':
+            line = _migrate_lazy_math_alphabet(line, 'klmspqabc', short, alph)
+    return line
+
+
+def migrate_deprecated(line: str) -> str:
+    for old, new in DEPRECATED.items():
+        while True:
+            old = old.replace('\\', r'\\')
+            m = re.search(old + '(?=![a-zA-Z@])', line)
+            if m is None:
+                break
+            else:
+                line = line[:m.start()] + new + line[m.end():]
+    return line
+
+
+def migrate_environments(line: str) -> str:
+    for old_env, new_env in ENVIRONMENTS.items():
+        line = line.replace(r'\begin{%s}' % old_env, r'\begin{%s}' % new_env)
+        line = line.replace(r'\end{%s}' % old_env, r'\end{%s}' % new_env)
+    return line
+
+
+def optimize_line(line: str) -> str:
+    line = migrate_environments(line)
+    line = migrate_lazy_math_alphabets(line)
+    line = migrate_deprecated(line)
+    return line
+
+
+def convert(path: Path):
+    with path.open('r') as f:
+        lines = f.readlines()
+    newlines = []
+    for line in lines:
+        newlines.append(optimize_line(line))
+
+    with path.open('w') as f:
+        path.write_text(''.join(newlines))
+
+
+if __name__ == "__main__":
+    here = Path('.')
+    for file in here.rglob('*.tex'):
+        convert(Path(file))