Automatically add `~` before each appearance of `\cite`

cite-formatter.py

import os
import sys
import glob
import logging

logging.basicConfig(level=logging.INFO)


def fix_cite_format(line_number: int, line: str):
    out = ""
    start = 0
    command = r"\cite"
    while True:
        pos = line.find(command, start)
        if pos == -1:
            break
        out += line[start:pos]
        if line[pos - 1] != "~":
            logging.warning(
                "Missing ~ before {} at line {} pos {}, surrounding text: {}".format(
                    command, line_number, pos, line[pos - 10 : pos + 30]
                )
            )
            out += "~"
        out += command
        start = pos + len(command)
    out += line[start:]
    return out


for fpath in glob.iglob('./**/*.tex', recursive=True):
    logging.info("Scanning file {}".format(fpath))
    filename = os.path.basename(fpath)
    formatted_text = ""
    with open(fpath, "r") as f:
        lines = f.readlines()
        for i, line in enumerate(lines):
            original_line = line
            line = fix_cite_format(i, line)
            if original_line != line:
                print("---")
                print(original_line)
                print("+++")
                print(line)
            formatted_text += line
    with open(fpath, "w") as f:
        f.write(formatted_text)