562fd85ca2
Allow sub-themes ("iconsets") to be merged into the "main" theme. That
way, effectively, it's possible to define colors and icons in separate
JSON files.
see #23
82 lines
2.5 KiB
Python
82 lines
2.5 KiB
Python
"""Theme support"""
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import os
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import copy
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import json
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import bumblebee.error
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def theme_path():
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"""Return the path of the theme directory"""
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return os.path.dirname("{}/../themes/".format(os.path.dirname(os.path.realpath(__file__))))
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class Theme(object):
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"""Represents a collection of icons and colors"""
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def __init__(self, name):
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self._init(self.load(name))
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def _init(self, data):
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"""Initialize theme from data structure"""
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for iconset in data.get("icons", []):
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self._merge(data, self._load_icons(iconset))
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self._theme = data
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self._defaults = data.get("defaults", {})
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def prefix(self, widget):
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"""Return the theme prefix for a widget's full text"""
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return self._get(widget, "prefix", None)
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def suffix(self, widget):
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"""Return the theme suffix for a widget's full text"""
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return self._get(widget, "suffix", None)
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def loads(self, data):
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theme = json.loads(data)
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self._init(theme)
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def _load_icons(self, name):
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path = "{}/icons/".format(theme_path())
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return self.load(name, path=path)
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def load(self, name, path=theme_path()):
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"""Load and parse a theme file"""
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themefile = "{}/{}.json".format(path, name)
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if os.path.isfile(themefile):
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try:
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with open(themefile) as data:
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return json.load(data)
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except ValueError as exception:
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raise bumblebee.error.ThemeLoadError("JSON error: {}".format(exception))
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else:
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raise bumblebee.error.ThemeLoadError("no such theme: {}".format(name))
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def _get(self, widget, name, default=None):
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module_theme = self._theme.get(widget.module(), {})
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value = self._defaults.get(name, default)
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value = module_theme.get(name, value)
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return value
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# algorithm copied from
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# http://blog.impressiver.com/post/31434674390/deep-merge-multiple-python-dicts
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# nicely done :)
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def _merge(self, target, *args):
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if len(args) > 1:
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for item in args:
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self._merge(item)
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return target
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item = args[0]
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if not isinstance(item, dict):
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return item
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for key, value in item.items():
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if key in target and isinstance(target[key], dict):
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self._merge(target[key], value)
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else:
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target[key] = copy.deepcopy(value)
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return target
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# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
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