Refactor configuration file parsing

Now the time for importing the kitty.config module has been halved, from
16ms from 32ms on my machine. Also, the new architecture will eventually
allow for auto generating a bunch of python-to-C boilerplate code.

kittens/diff/options/parse.py

@@ -0,0 +1,120 @@
+# generated by gen-config.py DO NOT edit
+# vim:fileencoding=utf-8
+
+import typing
+from kitty.conf.utils import merge_dicts, positive_int, python_string, to_color, to_color_or_none
+from kittens.diff.options.utils import parse_map, syntax_aliases
+
+
+class Parser:
+
+    def added_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['added_bg'] = to_color(val)
+
+    def added_margin_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['added_margin_bg'] = to_color(val)
+
+    def background(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['background'] = to_color(val)
+
+    def diff_cmd(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['diff_cmd'] = str(val)
+
+    def filler_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['filler_bg'] = to_color(val)
+
+    def foreground(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['foreground'] = to_color(val)
+
+    def highlight_added_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['highlight_added_bg'] = to_color(val)
+
+    def highlight_removed_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['highlight_removed_bg'] = to_color(val)
+
+    def hunk_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['hunk_bg'] = to_color(val)
+
+    def hunk_margin_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['hunk_margin_bg'] = to_color(val)
+
+    def margin_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['margin_bg'] = to_color(val)
+
+    def margin_fg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['margin_fg'] = to_color(val)
+
+    def margin_filler_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['margin_filler_bg'] = to_color_or_none(val)
+
+    def num_context_lines(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['num_context_lines'] = positive_int(val)
+
+    def pygments_style(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['pygments_style'] = str(val)
+
+    def removed_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['removed_bg'] = to_color(val)
+
+    def removed_margin_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['removed_margin_bg'] = to_color(val)
+
+    def replace_tab_by(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['replace_tab_by'] = python_string(val)
+
+    def search_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['search_bg'] = to_color(val)
+
+    def search_fg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['search_fg'] = to_color(val)
+
+    def select_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['select_bg'] = to_color(val)
+
+    def select_fg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['select_fg'] = to_color_or_none(val)
+
+    def syntax_aliases(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['syntax_aliases'] = syntax_aliases(val)
+
+    def title_bg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['title_bg'] = to_color(val)
+
+    def title_fg(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['title_fg'] = to_color(val)
+
+    def map(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        for k in parse_map(val):
+            ans['map'].append(k)
+
+
+def create_result_dict() -> typing.Dict[str, typing.Any]:
+    return {
+        'map': [],
+    }
+
+
+actions = frozenset(('map',))
+
+
+def merge_result_dicts(defaults: typing.Dict[str, typing.Any], vals: typing.Dict[str, typing.Any]) -> typing.Dict[str, typing.Any]:
+    ans = {}
+    for k, v in defaults.items():
+        if isinstance(v, dict):
+            ans[k] = merge_dicts(v, vals.get(k, {}))
+        elif k in actions:
+            ans[k] = v + vals.get(k, [])
+        else:
+            ans[k] = vals.get(k, v)
+    return ans
+
+
+parser = Parser()
+
+
+def parse_conf_item(key: str, val: str, ans: typing.Dict[str, typing.Any]) -> bool:
+    func = getattr(parser, key, None)
+    if func is not None:
+        func(val, ans)
+        return True
+    return False