| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "log" |
| 6 | "os" |
| 7 | "os/exec" |
| 8 | |
| 9 | "github.com/jezek/xgb" |
| 10 | "github.com/jezek/xgb/xinerama" |
| 11 | "github.com/jezek/xgb/xproto" |
| 12 | ) |
| 13 | |
| 14 | // TODO: Make a separate keysym file and fully populate it. |
| 15 | const ( |
| 16 | XK_q = 0x0071 |
| 17 | XK_Return = 0xff0d |
| 18 | ) |
| 19 | |
| 20 | // TODO: These module-level global variables have arisen while establishing |
| 21 | // basic functionality. Before proceeding much further, figure out what to do |
| 22 | // with them. |
| 23 | var xc *xgb.Conn |
| 24 | var attachedScreens []xinerama.ScreenInfo |
| 25 | var xroot xproto.ScreenInfo |
| 26 | var keymap [256][]xproto.Keysym |
| 27 | |
| 28 | func main() { |
| 29 | |
| 30 | // Build a connection to the X server -------------------------------------- |
| 31 | |
| 32 | xConn, err := xgb.NewConn() |
| 33 | if err != nil { |
| 34 | log.Fatal(err) |
| 35 | } |
| 36 | xc = xConn |
| 37 | defer xc.Close() |
| 38 | |
| 39 | // Determine what sort of screen(s) will display output -------------------- |
| 40 | |
| 41 | setup := xproto.Setup(xc) |
| 42 | if setup == nil || len(setup.Roots) < 1 { |
| 43 | log.Fatal("ILLI: Unable to parse received SetupInfo from X11 server.") |
| 44 | } |
| 45 | |
| 46 | if err := xinerama.Init(xc); err != nil { |
| 47 | log.Fatal(err) |
| 48 | } |
| 49 | |
| 50 | if r, err := xinerama.QueryScreens(xc).Reply(); err != nil { |
| 51 | log.Fatal(err) |
| 52 | } else { |
| 53 | if len(r.ScreenInfo) == 0 { |
| 54 | attachedScreens = []xinerama.ScreenInfo{ |
| 55 | xinerama.ScreenInfo{ |
| 56 | Width: setup.Roots[0].WidthInPixels, |
| 57 | Height: setup.Roots[0].HeightInPixels, |
| 58 | }, |
| 59 | } |
| 60 | } else { |
| 61 | attachedScreens = r.ScreenInfo |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | // Establish a root for the tree ------------------------------------------- |
| 66 | |
| 67 | connInfo := xproto.Setup(xc) |
| 68 | if connInfo == nil { |
| 69 | log.Fatal("ILLI: Unable to parse X connection information") |
| 70 | } |
| 71 | if len(connInfo.Roots) != 1 { |
| 72 | log.Fatal("ILLI: Inappropriate number of roots. Did xinerama initialize correctly?") |
| 73 | } |
| 74 | xroot = connInfo.Roots[0] |
| 75 | |
| 76 | // Register with the X server as the new window manager -------------------- |
| 77 | |
| 78 | if err := TakeWMOwnership(); err != nil { |
| 79 | if _, ok := err.(xproto.AccessError); ok { |
| 80 | log.Fatal("ILLI: Unable to register as window manager with X server. Perhaps another WM is already running?") |
| 81 | } |
| 82 | log.Fatal(err) |
| 83 | } |
| 84 | |
| 85 | fmt.Println("ILLI: Successfully registered as WM with X server.") |
| 86 | |
| 87 | // Setup keysym mappings and register for WM-relevant key events ----------- |
| 88 | |
| 89 | const ( |
| 90 | loKey = 8 |
| 91 | hiKey = 255 |
| 92 | ) |
| 93 | |
| 94 | m := xproto.GetKeyboardMapping(xc, loKey, hiKey-loKey+1) |
| 95 | reply, err := m.Reply() |
| 96 | if err != nil { |
| 97 | log.Fatal(err) |
| 98 | } |
| 99 | if reply == nil { |
| 100 | log.Fatal("Could not load keyboard map") |
| 101 | } |
| 102 | |
| 103 | for i := 0; i < hiKey-loKey+1; i++ { |
| 104 | keymap[loKey+i] = reply.Keysyms[i*int(reply.KeysymsPerKeycode) : (i+1)*int(reply.KeysymsPerKeycode)] |
| 105 | } |
| 106 | grabs := []struct { |
| 107 | sym xproto.Keysym |
| 108 | modifiers uint16 |
| 109 | codes []xproto.Keycode |
| 110 | }{ |
| 111 | { |
| 112 | sym: XK_q, |
| 113 | modifiers: xproto.ModMask1 | xproto.ModMaskShift, |
| 114 | }, |
| 115 | { |
| 116 | sym: XK_Return, |
| 117 | modifiers: xproto.ModMask1 | xproto.ModMaskShift, |
| 118 | }, |
| 119 | } |
| 120 | |
| 121 | for i, syms := range keymap { |
| 122 | for _, sym := range syms { |
| 123 | for c := range grabs { |
| 124 | if grabs[c].sym == sym { |
| 125 | grabs[c].codes = append(grabs[c].codes, xproto.Keycode(i)) |
| 126 | } |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | for _, grabbed := range grabs { |
| 131 | for _, code := range grabbed.codes { |
| 132 | if err := xproto.GrabKeyChecked( |
| 133 | xc, |
| 134 | false, |
| 135 | xroot.Root, |
| 136 | grabbed.modifiers, |
| 137 | code, |
| 138 | xproto.GrabModeAsync, |
| 139 | xproto.GrabModeAsync, |
| 140 | ).Check(); err != nil { |
| 141 | log.Print(err) |
| 142 | } |
| 143 | |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | // Build a list of windows needing management ------------------------------ |
| 148 | |
| 149 | tree, err := xproto.QueryTree(xc, xroot.Root).Reply() |
| 150 | if err != nil { |
| 151 | log.Fatal(err) |
| 152 | } |
| 153 | if tree != nil { |
| 154 | //workspaces = make(map[string]*Workspace) |
| 155 | //defaultw := &Workspace{mu: &sync.Mutex{}} |
| 156 | for _, c := range tree.Children { |
| 157 | if isMappedWindow(c) { |
| 158 | // err := defaultw.Add(c) |
| 159 | // if err != nil { |
| 160 | // log.Println(err) |
| 161 | // } |
| 162 | fmt.Println("ILLI: Found a client.") |
| 163 | } |
| 164 | |
| 165 | } |
| 166 | |
| 167 | // if len(attachedScreens) > 0 { |
| 168 | // defaultw.Screen = &attachedScreens[0] |
| 169 | // } |
| 170 | // |
| 171 | // workspaces["default"] = defaultw |
| 172 | // |
| 173 | // if err := defaultw.TileWindows(); err != nil { |
| 174 | // log.Println(err) |
| 175 | // } |
| 176 | |
| 177 | } |
| 178 | |
| 179 | // Main program loop reacts to X events ------------------------------------ |
| 180 | |
| 181 | eventloop: |
| 182 | for { |
| 183 | xevent, err := xc.WaitForEvent() |
| 184 | if err != nil { |
| 185 | log.Println(err) |
| 186 | continue |
| 187 | } |
| 188 | switch e := xevent.(type) { |
| 189 | case xproto.KeyPressEvent: |
| 190 | if err := handleKeyPressEvent(e); err != nil { |
| 191 | break eventloop |
| 192 | } |
| 193 | default: |
| 194 | log.Println(xevent) |
| 195 | } |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | // In addition to the basic key/button press/release events, by registering for |
| 200 | // events like SubstructureRedirect, we are declaring our intent to act as |
| 201 | // window manager for this X server. Only one WM is allowed per X server, a |
| 202 | // policy enforced on the X server's side by refusing the registration request |
| 203 | // for events like SubstructureRedirect if an existing process already receives |
| 204 | // those events (i.e. is already the window manager). |
| 205 | func TakeWMOwnership() error { |
| 206 | return xproto.ChangeWindowAttributesChecked( |
| 207 | xc, |
| 208 | xroot.Root, |
| 209 | xproto.CwEventMask, |
| 210 | []uint32{ |
| 211 | xproto.EventMaskKeyPress | |
| 212 | xproto.EventMaskKeyRelease | |
| 213 | xproto.EventMaskButtonPress | |
| 214 | xproto.EventMaskButtonRelease | |
| 215 | xproto.EventMaskStructureNotify | |
| 216 | xproto.EventMaskSubstructureRedirect, |
| 217 | // TODO: Should we also register for EventMaskSubstructureNotify ? |
| 218 | // Where is the authoritative list of events located? |
| 219 | }).Check() |
| 220 | } |
| 221 | |
| 222 | // The client list appears to have some entries for windows that shouldn't |
| 223 | // actually be viewable. For now, it appears that only windows with a |
| 224 | // `MapState` value of 2 should be viewable. TODO: Verify this. |
| 225 | // - https://github.com/BurntSushi/xgb/blob/master/xproto/xproto.go#L3772 |
| 226 | // - https://github.com/BurntSushi/xgb/blob/master/xproto/xproto.go#L10287 |
| 227 | func isMappedWindow(windowID xproto.Window) bool { |
| 228 | reply, err := xproto.GetWindowAttributes(xc, windowID).Reply() |
| 229 | if err != nil { |
| 230 | log.Fatal(err) |
| 231 | } |
| 232 | if reply != nil && reply.MapState == 2 { |
| 233 | return true |
| 234 | } |
| 235 | return false |
| 236 | } |
| 237 | |
| 238 | // TODO: Determine how I want to split the main event loop from the various |
| 239 | // event handlers (like this keypress handler). It shouldn't grow too |
| 240 | // fragmented, nor should it grow into a monolithic beast, but the balance |
| 241 | // needs to be selected after the handlers are built out more completely. |
| 242 | func handleKeyPressEvent(key xproto.KeyPressEvent) error { |
| 243 | switch keymap[key.Detail][0] { |
| 244 | case XK_q: |
| 245 | switch key.State { |
| 246 | case xproto.ModMask1 | xproto.ModMaskShift: |
| 247 | // TODO: Where and how do I want to handle exit/restart? |
| 248 | // ------------------------- |
| 249 | // We must manually close the X connection since we used |
| 250 | // `defer` when setting it up and os.Exit() short-circuits |
| 251 | // that deferral. |
| 252 | xc.Close() |
| 253 | os.Exit(0) |
| 254 | } |
| 255 | case XK_Return: |
| 256 | switch key.State { |
| 257 | case xproto.ModMask1 | xproto.ModMaskShift: |
| 258 | cmd := exec.Command("xterm") |
| 259 | err := cmd.Start() |
| 260 | if err != nil { |
| 261 | log.Fatal(err) |
| 262 | } |
| 263 | } |
| 264 | default: |
| 265 | return nil |
| 266 | } |
| 267 | return nil // TODO: What do I actually want to return here? |
| 268 | } |