diff options
Diffstat (limited to 'lib/menubar/icon_theme.lua')
| -rw-r--r-- | lib/menubar/icon_theme.lua | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/lib/menubar/icon_theme.lua b/lib/menubar/icon_theme.lua new file mode 100644 index 0000000..f76252f --- /dev/null +++ b/lib/menubar/icon_theme.lua @@ -0,0 +1,251 @@ +--------------------------------------------------------------------------- +--- Class module for icon lookup for menubar +-- +-- @author Kazunobu Kuriyama +-- @copyright 2015 Kazunobu Kuriyama +-- @classmod menubar.icon_theme +--------------------------------------------------------------------------- + +-- This implementation is based on the specifications: +-- Icon Theme Specification 0.12 +-- http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-0.12.html + +local beautiful = require("beautiful") +local awful_util = require("awful.util") +local GLib = require("lgi").GLib +local index_theme = require("menubar.index_theme") + +local ipairs = ipairs +local setmetatable = setmetatable +local string = string +local table = table +local math = math + +local get_pragmatic_base_directories = function() + local dirs = {} + + local dir = GLib.build_filenamev({GLib.get_home_dir(), ".icons"}) + if awful_util.dir_readable(dir) then + table.insert(dirs, dir) + end + + dir = GLib.build_filenamev({GLib.get_user_data_dir(), "icons"}) + if awful_util.dir_readable(dir) then + table.insert(dirs, dir) + end + + for _, v in ipairs(GLib.get_system_data_dirs()) do + dir = GLib.build_filenamev({v, "icons"}) + if awful_util.dir_readable(dir) then + table.insert(dirs, dir) + end + end + + local need_usr_share_pixmaps = true + for _, v in ipairs(GLib.get_system_data_dirs()) do + dir = GLib.build_filenamev({v, "pixmaps"}) + if awful_util.dir_readable(dir) then + table.insert(dirs, dir) + end + if dir == "/usr/share/pixmaps" then + need_usr_share_pixmaps = false + end + end + + dir = "/usr/share/pixmaps" + if need_usr_share_pixmaps and awful_util.dir_readable(dir) then + table.insert(dirs, dir) + end + + return dirs +end + +local get_default_icon_theme_name = function() + local icon_theme_names = { "Adwaita", "gnome", "hicolor" } + for _, dir in ipairs(get_pragmatic_base_directories()) do + for _, icon_theme_name in ipairs(icon_theme_names) do + local filename = string.format("%s/%s/index.theme", dir, icon_theme_name) + if awful_util.file_readable(filename) then + return icon_theme_name + end + end + end + return nil +end + +local icon_theme = { mt = {} } + +local index_theme_cache = {} + +--- Class constructor of `icon_theme` +-- @tparam string icon_theme_name Internal name of icon theme +-- @tparam table base_directories Paths used for lookup +-- @treturn table An instance of the class `icon_theme` +icon_theme.new = function(icon_theme_name, base_directories) + icon_theme_name = icon_theme_name or beautiful.icon_theme or get_default_icon_theme_name() + base_directories = base_directories or get_pragmatic_base_directories() + + local self = {} + self.icon_theme_name = icon_theme_name + self.base_directories = base_directories + self.extensions = { "png", "svg", "xpm" } + + -- Instantiate index_theme (cached). + if not index_theme_cache[self.icon_theme_name] then + index_theme_cache[self.icon_theme_name] = {} + end + local cache_key = table.concat(self.base_directories, ':') + if not index_theme_cache[self.icon_theme_name][cache_key] then + index_theme_cache[self.icon_theme_name][cache_key] = index_theme( + self.icon_theme_name, + self.base_directories) + end + self.index_theme = index_theme_cache[self.icon_theme_name][cache_key] + + return setmetatable(self, { __index = icon_theme }) +end + +local directory_matches_size = function(self, subdirectory, icon_size) + local kind, size, min_size, max_size, threshold = self.index_theme:get_per_directory_keys(subdirectory) + + if kind == "Fixed" then + return icon_size == size + elseif kind == "Scalable" then + return icon_size >= min_size and icon_size <= max_size + elseif kind == "Threshold" then + return icon_size >= size - threshold and icon_size <= size + threshold + end + + return false +end + +local directory_size_distance = function(self, subdirectory, icon_size) + local kind, size, min_size, max_size, threshold = self.index_theme:get_per_directory_keys(subdirectory) + + if kind == "Fixed" then + return math.abs(icon_size - size) + elseif kind == "Scalable" then + if icon_size < min_size then + return min_size - icon_size + elseif icon_size > max_size then + return icon_size - max_size + end + return 0 + elseif kind == "Threshold" then + if icon_size < size - threshold then + return min_size - icon_size + elseif icon_size > size + threshold then + return icon_size - max_size + end + return 0 + end + + return 0xffffffff -- Any large number will do. +end + +local lookup_icon = function(self, icon_name, icon_size) + local checked_already = {} + for _, subdir in ipairs(self.index_theme:get_subdirectories()) do + for _, basedir in ipairs(self.base_directories) do + for _, ext in ipairs(self.extensions) do + if directory_matches_size(self, subdir, icon_size) then + local filename = string.format("%s/%s/%s/%s.%s", + basedir, self.icon_theme_name, subdir, + icon_name, ext) + if awful_util.file_readable(filename) then + return filename + else + checked_already[filename] = true + end + end + end + end + end + + local minimal_size = 0xffffffff -- Any large number will do. + local closest_filename = nil + for _, subdir in ipairs(self.index_theme:get_subdirectories()) do + local dist = directory_size_distance(self, subdir, icon_size) + if dist < minimal_size then + for _, basedir in ipairs(self.base_directories) do + for _, ext in ipairs(self.extensions) do + local filename = string.format("%s/%s/%s/%s.%s", + basedir, self.icon_theme_name, subdir, + icon_name, ext) + if not checked_already[filename] then + if awful_util.file_readable(filename) then + closest_filename = filename + minimal_size = dist + end + end + end + end + end + end + return closest_filename +end + +local find_icon_path_helper -- Gets called recursively. +find_icon_path_helper = function(self, icon_name, icon_size) + local filename = lookup_icon(self, icon_name, icon_size) + if filename then + return filename + end + + for _, parent in ipairs(self.index_theme:get_inherits()) do + local parent_icon_theme = icon_theme(parent, self.base_directories) + filename = find_icon_path_helper(parent_icon_theme, icon_name, icon_size) + if filename then + return filename + end + end + + return nil +end + +local lookup_fallback_icon = function(self, icon_name) + for _, dir in ipairs(self.base_directories) do + for _, ext in ipairs(self.extensions) do + local filename = string.format("%s/%s.%s", + dir, + icon_name, ext) + if awful_util.file_readable(filename) then + return filename + end + end + end + return nil +end + +--- Look up an image file based on a given icon name and/or a preferable size. +-- @tparam string icon_name Icon name to be looked up +-- @tparam number icon_size Prefereable icon size +-- @treturn string Absolute path to the icon file, or nil if not found +function icon_theme:find_icon_path(icon_name, icon_size) + icon_size = icon_size or 16 + if not icon_name or icon_name == "" then + return nil + end + + local filename = find_icon_path_helper(self, icon_name, icon_size) + if filename then + return filename + end + + if self.icon_theme_name ~= "hicolor" then + filename = find_icon_path_helper(icon_theme("hicolor", self.base_directories), icon_name, icon_size) + if filename then + return filename + end + end + + return lookup_fallback_icon(self, icon_name) +end + +icon_theme.mt.__call = function(_, ...) + return icon_theme.new(...) +end + +return setmetatable(icon_theme, icon_theme.mt) + +-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80 |