298 lines
9.6 KiB
Fennel
298 lines
9.6 KiB
Fennel
(local {: Gio
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: GLib
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: GObject
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: Gtk
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: GdkPixbuf
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: Gdk
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: Pango}
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(require :lgi))
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(local {: List
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: stringx
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: tablex
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}
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((require :pl.import_into)))
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(local dbus (require :dbus_proxy))
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(local lfs (require :lfs))
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(local inifile (require :inifile))
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(local posix (require :posix))
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(local ICON_SIZE 64)
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(local CSS "
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* {
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color: rgb(255, 255, 255);
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text-shadow:
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0px 1px rgba(0, 0, 0, 255)
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, 1px 0px rgba(0, 0, 0, 255)
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, 0px -1px rgba(0, 0, 0, 255)
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, -1px 0px rgba(0, 0, 0, 255)
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, 1px 1px rgba(0, 0, 0, 255)
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, 1px -1px rgba(0, 0, 0, 255)
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, -1px 1px rgba(0, 0, 0, 255)
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, -1px -1px rgba(0, 0, 0, 255)
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;
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}
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button.appbutton {
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padding: 0px;
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}
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#toplevel {
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background-color: rgba(0, 0, 0, 0.6);
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}
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")
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(local dbus-service-attrs
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{
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:bus dbus.Bus.SESSION
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:name "net.telent.saturn"
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:interface "net.telent.saturn"
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:path "/net/telent/saturn"
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})
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(local bus (dbus.Proxy:new
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{
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:bus dbus.Bus.SESSION
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:name "org.freedesktop.DBus"
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:interface "org.freedesktop.DBus"
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:path "/org/freedesktop/DBus"
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}))
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(local interface-info
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(let [xml
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"<node>
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<interface name='net.telent.saturn'>
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<method name='SetVisible'>
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<arg type='b' name='visible' direction='in'/>
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<doc:doc><doc:description>
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Switch visibility of launcher window
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</doc:description></doc:doc>
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</method>
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<method name='ToggleVisible'>
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<doc:doc><doc:description>
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Toggle launcher window visible/invisible
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</doc:description></doc:doc>
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</method>
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<property name='Visible' type='b' access='read'>
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</property>
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</interface>
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</node>"
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node-info (Gio.DBusNodeInfo.new_for_xml xml)]
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(. node-info.interfaces 1)))
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;; these values don't seem to be available through introspection
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(local DBUS_NAME_FLAG_DO_NOT_QUEUE 4)
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(local DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER 1)
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(local DBUS_REQUEST_NAME_REPLY_IN_QUEUE 2)
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(local DBUS_REQUEST_NAME_REPLY_EXISTS 3)
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(local DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER 4)
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(let [ret (bus:RequestName dbus-service-attrs.name
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DBUS_NAME_FLAG_DO_NOT_QUEUE)]
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(match ret
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DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER
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true
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DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER
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true
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DBUS_REQUEST_NAME_REPLY_IN_QUEUE
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(error "unexpected DBUS_REQUEST_NAME_REPLY_IN_QUEUE")
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DBUS_REQUEST_NAME_REPLY_EXISTS
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;; Show the currently running instance
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(let [saturn (dbus.Proxy:new dbus-service-attrs)]
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(saturn:SetVisible true)
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(os.exit 0))))
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(local path {
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:absolute? (fn [str] (= (str:sub 1 1) "/"))
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:concat (fn [...] (table.concat [...] "/"))
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})
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(local search-path {
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:concat (fn [...] (table.concat [...] ":"))
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})
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(local icon-theme (Gtk.IconTheme.get_default))
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;; Use the declared CSS for this app
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(let [style_provider (Gtk.CssProvider)]
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(style_provider:load_from_data CSS)
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(Gtk.StyleContext.add_provider_for_screen
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(Gdk.Screen.get_default)
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style_provider
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Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
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))
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(local window (Gtk.Window {
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:title "Saturn V"
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:name "toplevel"
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:default_width 720
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:default_height 800
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:on_destroy Gtk.main_quit
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}))
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;; Using RGBA visual for semi-transparent backgrounds
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;; Requires compositing (e.g. a compositor on X11)
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(let [screen (window:get_screen)
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visual (screen:get_rgba_visual)]
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(window:set_visual visual))
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(fn find-icon [name]
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(var found false)
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(if (path.absolute? name)
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;; From a direct path
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(set found (GdkPixbuf.Pixbuf.new_from_file_at_size name ICON_SIZE ICON_SIZE))
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;; From icon theme
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(let [sizes (icon-theme:get_icon_sizes name)]
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;; Uses a list of "safe fallback" values
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;; Try the desired size first
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(each [_ res (pairs [ICON_SIZE 128 64 48]) :until found]
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(set found
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(-?> (icon-theme:load_icon
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name res
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(+ Gtk.IconLookupFlags.FORCE_SVG Gtk.IconLookupFlags.USE_BUILTIN))
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(: :scale_simple ICON_SIZE ICON_SIZE GdkPixbuf.InterpType.BILINEAR))))
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))
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(Gtk.Image.new_from_pixbuf found))
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(fn read-desktop-file [f]
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(let [parsed (inifile.parse f)
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vals (. parsed "Desktop Entry")]
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(tset vals "IconImage"
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(find-icon (or vals.Icon "application-x-executable")))
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(tset vals "ID" (f:sub 0 -9))
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vals))
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(fn current-user-home []
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"Returns current user's home directory."
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(-> (posix.unistd.getuid)
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(posix.pwd.getpwuid)
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(. :pw_dir)))
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(fn xdg-data-home []
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"Provides XDG_DATA_HOME or its default fallback value"
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(or (os.getenv "XDG_DATA_HOME")
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(path.concat (current-user-home) ".local/share/")))
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(fn xdg-data-dirs []
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"Provides all data-dirs as a List. Most important first."
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;; Expected to be used with gmatch as a generator.
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(let [dirs (List)]
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(dirs:append (xdg-data-home))
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(dirs:extend (stringx.split (os.getenv "XDG_DATA_DIRS") ":"))
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dirs
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))
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(fn all-apps []
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;; Each desktop entry representing an application is identified
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;; by its desktop file ID, which is based on its filename.
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;; — https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#desktop-file-id
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"Provides apps in a List, sorted by name"
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(var apps-table {})
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;; Reversing the data dirs gives priority to the first elements.
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;; This means conflicting `.desktop` files (or: desktop file ID) are given
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;; priority to the first elements by "simply" reading it last.
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(each [path (List.iter (List.reverse (xdg-data-dirs)))]
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(let [apps-dir (.. path "/applications/")]
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(when (lfs.attributes apps-dir)
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(each [f (lfs.dir apps-dir)]
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(when (= (f:sub -8) ".desktop")
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(let [attrs (read-desktop-file (.. apps-dir f))]
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(when (not attrs.NoDisplay)
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(tset apps-table attrs.ID attrs))))))))
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;; We have a table indexed by IDs, we don't care about the indexing.
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;; Make a List and sort it by name.
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(List.sort (List (tablex.values apps-table))
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(fn [a b] (< (string.upper a.Name) (string.upper b.Name)))))
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;; Exec entries in desktop files may contain %u %f and other characters
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;; in which the launcher is supposed to interpolate filenames/urls etc.
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;; We don't afford the user any way to pick filenames, but we do need
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;; to remove the placeholders.
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(fn parse-percents [str]
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(str:gsub "%%(.)" (fn [c] (if (= c "%") "%" ""))))
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(fn spawn-async [vec]
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(let [pid (posix.unistd.fork)]
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(if (> pid 0) true
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(< pid 0) (assert (= "can't fork" nil))
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(do
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(for [f 3 255] (posix.unistd.close f))
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(posix.execp "/usr/bin/env" vec)))))
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(fn launch [app]
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;; FIXME check app.DBusActivatable and do DBus launch if true
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(let [cmd (parse-percents app.Exec)]
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(if app.Terminal
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(spawn-async ["kitty" cmd])
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(spawn-async ["sh" "-c" cmd]))
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(window:hide)))
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(fn button-for [app]
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(doto (Gtk.Button
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{
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:image-position Gtk.PositionType.TOP
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:relief Gtk.ReliefStyle.NONE
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:on_clicked #(launch app)
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})
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(-> (: :get_style_context) (: :add_class "appbutton"))
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(: :add
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(doto (Gtk.Box {:orientation Gtk.Orientation.VERTICAL})
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(: :pack_start app.IconImage false false 0)
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(: :pack_start
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(doto
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(Gtk.Label {
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;; https://stackoverflow.com/questions/27462926/how-to-set-max-width-of-gtklabel-properly
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:label app.Name
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:justify Gtk.Justification.CENTER
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:ellipsize Pango.EllipsizeMode.END
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:hexpand true
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})
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(: :set_max_width_chars 1))
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true true 0)
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))))
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(fn handle-dbus-method-call [conn sender path interface method params invocation]
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(when (and (= path dbus-service-attrs.path)
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(= interface dbus-service-attrs.interface))
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(match method
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"SetVisible"
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(let [[value] (dbus.variant.strip params)]
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(if value (window:show_all) (window:hide))
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(invocation:return_value nil))
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"ToggleVisible"
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(let [v window.visible]
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(if v (window:hide) (window:show_all))
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(invocation:return_value nil)))))
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(fn handle-dbus-get [conn sender path interface name]
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(when (and (= path dbus-service-attrs.path)
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(= interface dbus-service-attrs.interface)
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(= name "Visible"))
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(GLib.Variant "b" window.visible)))
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(Gio.DBusConnection.register_object
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bus.connection
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dbus-service-attrs.path
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interface-info
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(GObject.Closure handle-dbus-method-call)
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(GObject.Closure handle-dbus-get)
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(GObject.Closure (fn [a] (print "set"))))
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(let [grid (Gtk.FlowBox {
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:orientation Gtk.Orientation.HORIZONTAL
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:valign Gtk.Align.START
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:column_spacing 2
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:row_spacing 5
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:homogeneous true
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})
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scrolled-window (Gtk.ScrolledWindow {})]
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(each [app (List.iter (all-apps))]
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(grid:insert (button-for app) -1))
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(scrolled-window:add grid)
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(window:add scrolled-window))
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(window:show_all)
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(Gtk:main)
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