Full migration and transition to Rust; Remove python artifacts

crates/myfsio-server/templates/_convert.py

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+import os
+import re
+import sys
+
+TEMPLATE_DIR = os.path.dirname(os.path.abspath(__file__))
+
+TERNARY_RE = re.compile(
+    r"""(\{\{\s*)
+        (?:"([^"]*)"|'([^']*)')      # literal A
+        \s+if\s+
+        ([^{}]+?)                    # condition
+        \s+else\s+
+        (?:"([^"]*)"|'([^']*)')      # literal B
+        (\s*\}\})""",
+    re.VERBOSE,
+)
+
+TERNARY_SET_RE = re.compile(
+    r"""(\{%\s*set\s+([A-Za-z_][A-Za-z_0-9]*)\s*=\s*)
+        (?:"([^"]*)"|'([^']*)')
+        \s+if\s+
+        ([^{}]+?)
+        \s+else\s+
+        (?:"([^"]*)"|'([^']*)')
+        (\s*%\})""",
+    re.VERBOSE,
+)
+
+
+def convert_single_quoted_strings_in_expressions(text: str) -> str:
+    """Inside {{...}} or {%...%}, swap ' for " around tokens that look like strings."""
+    def fix(m):
+        body = m.group(2)
+        body_fixed = re.sub(r"'([^'\\\n]*)'", r'"\1"', body)
+        return m.group(1) + body_fixed + m.group(3)
+
+    return re.sub(
+        r"(\{[{%])([^{}]*?)([}%]\})",
+        fix,
+        text,
+        flags=re.DOTALL,
+    )
+
+
+def convert_inline_ternary(text: str) -> str:
+    def repl_expr(m):
+        a = m.group(2) if m.group(2) is not None else m.group(3)
+        cond = m.group(4)
+        b = m.group(5) if m.group(5) is not None else m.group(6)
+        return (
+            '{% if ' + cond + ' %}' + a + '{% else %}' + b + '{% endif %}'
+        )
+
+    def repl_set(m):
+        varname = m.group(2)
+        a = m.group(3) if m.group(3) is not None else m.group(4)
+        cond = m.group(5)
+        b = m.group(6) if m.group(6) is not None else m.group(7)
+        return (
+            '{% if ' + cond + ' %}{% set ' + varname + ' = "' + a + '" %}'
+            '{% else %}{% set ' + varname + ' = "' + b + '" %}{% endif %}'
+        )
+
+    prev = None
+    while prev != text:
+        prev = text
+        text = TERNARY_SET_RE.sub(repl_set, text)
+        text = TERNARY_RE.sub(repl_expr, text)
+    return text
+
+
+def convert_request_args(text: str) -> str:
+    text = re.sub(
+        r'request\.args\.get\(\s*"([^"]+)"\s*,\s*"([^"]*)"\s*\)',
+        r'request_args.\1 | default(value="\2")',
+        text,
+    )
+    text = re.sub(
+        r'request\.args\.get\(\s*"([^"]+)"\s*\)',
+        r'request_args.\1',
+        text,
+    )
+    text = text.replace('request.endpoint', 'current_endpoint')
+    return text
+
+
+def convert_items_keys(text: str) -> str:
+    text = re.sub(r'\.items\(\)', '', text)
+    text = re.sub(r'\.keys\(\)', '', text)
+    text = re.sub(r'\.values\(\)', '', text)
+    return text
+
+
+def convert_tojson(text: str) -> str:
+    text = re.sub(r'\|\s*tojson\b', '| json_encode | safe', text)
+    return text
+
+
+def convert_is_none(text: str) -> str:
+    text = re.sub(r'\bis\s+not\s+none\b', '!= null', text)
+    text = re.sub(r'\bis\s+none\b', '== null', text)
+    return text
+
+
+def convert_namespace(text: str) -> str:
+    def repl(m):
+        body = m.group(1)
+        assigns = [a.strip() for a in body.split(',')]
+        return '{# namespace shim #}'
+
+    text = re.sub(
+        r'\{%\s*set\s+ns\s*=\s*namespace\(([^)]*)\)\s*%\}',
+        repl,
+        text,
+    )
+    text = re.sub(r'\bns\.([A-Za-z_][A-Za-z_0-9]*)\s*=\s*', r'{% set_global \1 = ', text)
+    text = re.sub(r'\bns\.([A-Za-z_][A-Za-z_0-9]*)', r'\1', text)
+    return text
+
+
+def convert_url_for_positional(text: str) -> str:
+    """url_for("x", ...) -> url_for(endpoint="x", ...)"""
+    def repl(m):
+        prefix = m.group(1)
+        endpoint = m.group(2)
+        rest = m.group(3) or ''
+        rest = rest.strip()
+        if rest.startswith(','):
+            rest = rest[1:].strip()
+        if rest:
+            return f'{prefix}(endpoint="{endpoint}", {rest})'
+        return f'{prefix}(endpoint="{endpoint}")'
+
+    pattern = re.compile(r'(url_for)\(\s*"([^"]+)"\s*((?:,[^()]*)?)\)')
+    prev = None
+    while prev != text:
+        prev = text
+        text = pattern.sub(repl, text)
+    return text
+
+
+def convert_d_filter(text: str) -> str:
+    text = re.sub(r'\|\s*d\(\s*([^)]*?)\s*\)', lambda m: f'| default(value={m.group(1) or 0})', text)
+    return text
+
+
+def convert_replace_filter(text: str) -> str:
+    def repl(m):
+        a = m.group(1)
+        b = m.group(2)
+        return f'| replace(from="{a}", to="{b}")'
+    text = re.sub(r'\|\s*replace\(\s*"([^"]*)"\s*,\s*"([^"]*)"\s*\)', repl, text)
+    return text
+
+
+def convert_truncate_filter(text: str) -> str:
+    def repl(m):
+        n = m.group(1)
+        return f'| truncate(length={n})'
+    text = re.sub(r'\|\s*truncate\(\s*(\d+)\s*(?:,[^)]*)?\)', repl, text)
+    return text
+
+
+def convert_strip_method(text: str) -> str:
+    text = re.sub(r'(\b[A-Za-z_][A-Za-z_0-9.\[\]"]*)\s*\.\s*strip\(\s*\)', r'\1 | trim', text)
+    return text
+
+
+def convert_split_method(text: str) -> str:
+    def repl(m):
+        obj = m.group(1)
+        sep = m.group(2)
+        return f'{obj} | split(pat="{sep}")'
+    text = re.sub(r'(\b[A-Za-z_][A-Za-z_0-9.]*)\s*\.\s*split\(\s*"([^"]*)"\s*\)', repl, text)
+    return text
+
+
+def convert_python_slice(text: str) -> str:
+    def repl_colon(m):
+        obj = m.group(1)
+        start = m.group(2) or '0'
+        end = m.group(3)
+        if start.startswith('-') or (end and end.startswith('-')):
+            return m.group(0)
+        if end:
+            return f'{obj} | slice(start={start}, end={end})'
+        return f'{obj} | slice(start={start})'
+
+    def repl_neg_end(m):
+        obj = m.group(1)
+        n = m.group(2)
+        return f'{obj} | slice(start=-{n})'
+
+    text = re.sub(
+        r'(\b[A-Za-z_][A-Za-z_0-9.]*)\[\s*(-?\d*)\s*:\s*(-?\d*)\s*\]',
+        repl_colon,
+        text,
+    )
+    text = re.sub(
+        r'(\b[A-Za-z_][A-Za-z_0-9.]*)\|\s*slice\(start=-(\d+)\s*,\s*end=\s*\)',
+        repl_neg_end,
+        text,
+    )
+    return text
+
+
+def convert_inline_ternary_expr(text: str) -> str:
+    """Handle arbitrary ternary inside {{ ... }}: A if COND else B -> {% if COND %}A{% else %}B{% endif %}"""
+    out_lines = []
+    for line in text.split('\n'):
+        out_lines.append(_convert_line_ternary(line))
+    return '\n'.join(out_lines)
+
+
+def _convert_line_ternary(line: str) -> str:
+    if '{{' not in line or ' if ' not in line or ' else ' not in line:
+        return line
+    prev = None
+    while prev != line:
+        prev = line
+        m = re.search(r'\{\{\s*([^{}]+?)\s+if\s+([^{}]+?)\s+else\s+([^{}]+?)\s*\}\}', line)
+        if not m:
+            break
+        replacement = '{% if ' + m.group(2) + ' %}{{ ' + m.group(1) + ' }}{% else %}{{ ' + m.group(3) + ' }}{% endif %}'
+        line = line[:m.start()] + replacement + line[m.end():]
+    return line
+
+
+def convert_dict_get(text: str) -> str:
+    """Convert X.get("key", default) -> X.key | default(value=default) when simple."""
+    pattern = re.compile(
+        r'([A-Za-z_][A-Za-z_0-9]*(?:\.[A-Za-z_][A-Za-z_0-9]*)*)'
+        r'\.get\(\s*"([A-Za-z_][A-Za-z_0-9]*)"\s*(?:,\s*([^(){}]+?))?\s*\)'
+    )
+
+    def repl(m):
+        obj = m.group(1)
+        key = m.group(2)
+        default = (m.group(3) or '').strip()
+        if default:
+            return f'{obj}.{key} | default(value={default})'
+        return f'{obj}.{key}'
+
+    prev = None
+    while prev != text:
+        prev = text
+        text = pattern.sub(repl, text)
+    return text
+
+
+def convert_file(path: str) -> bool:
+    with open(path, 'r', encoding='utf-8') as f:
+        original = f.read()
+    text = original
+    text = convert_single_quoted_strings_in_expressions(text)
+    text = convert_inline_ternary(text)
+    text = convert_request_args(text)
+    text = convert_items_keys(text)
+    text = convert_tojson(text)
+    text = convert_is_none(text)
+    text = convert_namespace(text)
+    text = convert_dict_get(text)
+    text = convert_url_for_positional(text)
+    text = convert_d_filter(text)
+    text = convert_replace_filter(text)
+    text = convert_truncate_filter(text)
+    text = convert_strip_method(text)
+    text = convert_split_method(text)
+    text = convert_python_slice(text)
+    text = convert_inline_ternary_expr(text)
+    if text != original:
+        with open(path, 'w', encoding='utf-8', newline='\n') as f:
+            f.write(text)
+        return True
+    return False
+
+
+def main():
+    changed = []
+    for name in sorted(os.listdir(TEMPLATE_DIR)):
+        if not name.endswith('.html'):
+            continue
+        p = os.path.join(TEMPLATE_DIR, name)
+        if convert_file(p):
+            changed.append(name)
+    print('Changed:', len(changed))
+    for c in changed:
+        print(' -', c)
+
+
+if __name__ == '__main__':
+    main()