From 467b774d13ec47e623524d20acd7b19e30927480 Mon Sep 17 00:00:00 2001
From: Nikita Uvarov <uv.nikita@gmail.com>
Date: Fri, 22 Sep 2017 23:52:26 +0200
Subject: [PATCH] i3: add module

---
 modules/default.nix                     |   1 +
 modules/misc/news.nix                   |   7 +
 modules/services/window-managers/i3.nix | 576 ++++++++++++++++++++++++
 3 files changed, 584 insertions(+)
 create mode 100644 modules/services/window-managers/i3.nix

diff --git a/modules/default.nix b/modules/default.nix
index c10a4cb5d..f82cfdbbc 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -57,6 +57,7 @@ let
     ./services/taffybar.nix
     ./services/tahoe-lafs.nix
     ./services/udiskie.nix
+    ./services/window-managers/i3.nix
     ./services/window-managers/xmonad.nix
     ./services/xscreensaver.nix
     ./systemd.nix
diff --git a/modules/misc/news.nix b/modules/misc/news.nix
index e2bceb92c..ac969f160 100644
--- a/modules/misc/news.nix
+++ b/modules/misc/news.nix
@@ -418,6 +418,13 @@ in
           directory.
         '';
       }
+
+      {
+        time = "2017-10-31T11:46:07+00:00";
+        message = ''
+          A new window manager module is available: 'xsession.windowManager.i3'.
+        '';
+      }
     ];
   };
 }
diff --git a/modules/services/window-managers/i3.nix b/modules/services/window-managers/i3.nix
new file mode 100644
index 000000000..d224c4a4f
--- /dev/null
+++ b/modules/services/window-managers/i3.nix
@@ -0,0 +1,576 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+with import ../../lib/dag.nix { inherit lib; };
+
+let
+
+  cfg = config.xsession.windowManager.i3;
+
+  startupModule = types.submodule {
+    options = {
+      command = mkOption {
+        type = types.string;
+        description = "Command that will be executed on startup.";
+      };
+
+      always = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to run command on each i3 restart.";
+      };
+
+      workspace = mkOption {
+        type = types.nullOr types.string;
+        default = null;
+        description = "Launch application on a particular workspace.";
+      };
+    };
+  };
+
+  colorSetModule = types.submodule {
+    options = {
+      border = mkOption {
+        type = types.string;
+        visible = false;
+      };
+
+      childBorder = mkOption {
+        type = types.string;
+        visible = false;
+      };
+
+      background = mkOption {
+        type = types.string;
+        visible = false;
+      };
+
+      text = mkOption {
+        type = types.string;
+        visible = false;
+      };
+
+      indicator = mkOption {
+        type = types.string;
+        visible = false;
+      };
+    };
+  };
+
+  barModule = types.submodule {
+    options = {
+      mode = mkOption {
+        type = types.enum [ "dock" "hide" "invisible" ];
+        default = "dock";
+        description = "Bar visibility mode.";
+      };
+
+      hiddenState = mkOption {
+        type = types.enum [ "hide" "show" ];
+        default = "hide";
+        description = "The default bar mode when 'bar.mode' == 'hide'.";
+      };
+
+      position = mkOption {
+        type = types.enum [ "top" "bottom" ];
+        default = "bottom";
+        description = "The edge of the screen i3bar should show up.";
+      };
+
+      workspaceButtons = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Whether workspace buttons should be shown or not.";
+      };
+
+      statusCommand = mkOption {
+        type = types.string;
+        default = "${pkgs.i3status}/bin/i3status";
+        description = "Command that will be used to get status lines.";
+      };
+
+    };
+  };
+
+  criteriaModule = types.attrs;
+
+  configModule = types.submodule {
+    options = {
+      fonts = mkOption {
+        type = types.listOf types.string;
+        default = ["monospace 8"];
+        description = ''
+          Font list used for window titles. Only FreeType fonts are supported.
+          The order here is improtant (e.g. icons font should go before the one used for text).
+        '';
+        example = [ "FontAwesome 10" "Terminus 10" ];
+      };
+
+      window = mkOption {
+        type = types.submodule {
+          options = {
+            titlebar = mkOption {
+              type = types.bool;
+              default = cfg.package != pkgs.i3-gaps;
+              defaultText = "xsession.windowManager.i3.package != nixpkgs.i3-gaps (titlebar should be disabled for i3-gaps)";
+              description = "Whether to show window titlebars.";
+            };
+
+            border = mkOption {
+              type = types.int;
+              default = 2;
+              description = "Window border width.";
+            };
+          };
+        };
+        default = {};
+        description = "Window titlebar and border settings.";
+      };
+
+      floating = mkOption {
+        type = types.submodule {
+          options = {
+            titlebar = mkOption {
+              type = types.bool;
+              default = cfg.package != pkgs.i3-gaps;
+              defaultText = "xsession.windowManager.i3.package != nixpkgs.i3-gaps (titlebar should be disabled for i3-gaps)";
+              description = "Whether to show floating window titlebars.";
+            };
+
+            border = mkOption {
+              type = types.int;
+              default = 2;
+              description = "Floating windows border width.";
+            };
+
+            modifier = mkOption {
+              type = types.enum [ "Shift" "Control" "Mod1" "Mod2" "Mod3" "Mod4" "Mod5" ];
+              default = "Mod1";
+              description = "Modifier key that can be used to drag floating windows.";
+              example = "Mod4";
+            };
+
+            criteria = mkOption {
+              type = types.listOf criteriaModule;
+              default = [];
+              description = "List of criteria for windows that should be opened in a floating mode.";
+              example = [ "title='Steam - Update News'" "class='Pavucontrol'" ];
+            };
+          };
+        };
+        default = {};
+        description = "Floating window settings.";
+      };
+
+      focus = mkOption {
+        type = types.submodule {
+          options = {
+            newWindow = mkOption {
+              type =types.enum [ "smart" "urgent" "focus" "none" ];
+              default = "smart";
+              description = ''
+                This option modifies focus behavior on new window activation.
+
+                See <link xlink:href="https://i3wm.org/docs/userguide.html#focus_on_window_activation"/>
+              '';
+              example = "none";
+            };
+
+            followMouse = mkOption {
+              type = types.bool;
+              default = true;
+              description = "Whether focus should follow the mouse.";
+            };
+
+            forceWrapping = mkOption {
+              type = types.bool;
+              default = false;
+              description = ''
+                Whether to force focus wrapping in tabbed or stacked container.
+
+                See <link xlink:href="https://i3wm.org/docs/userguide.html#_focus_wrapping"/>
+              '';
+            };
+          };
+        };
+        default = {};
+        description = "Focus related settings.";
+      };
+
+      assigns = mkOption {
+        type = types.attrsOf (types.listOf criteriaModule);
+        default = {};
+        description = ''
+          An attribute set that assignes applications to workspaces based
+          on criteria.
+        '';
+        example = literalExample ''
+          {
+            "1: web" = [{ class = "^Firefox$"; }];
+            "0: extra" = [{ class = "^Firefox$"; window_role = "About"; }];
+          }
+        '';
+      };
+
+      keybindings = mkOption {
+        type = types.attrs;
+        default = {
+          "Mod1+Return" = "exec i3-sensible-terminal";
+          "Mod1+Shift+q" = "kill";
+          "Mod1+d" = "exec ${pkgs.dmenu}/bin/dmenu_run";
+
+          "Mod1+Left" = "focus left";
+          "Mod1+Down" = "focus down";
+          "Mod1+Up" = "focus up";
+          "Mod1+Right" = "focus right";
+
+          "Mod1+h" = "split h";
+          "Mod1+v" = "split v";
+          "Mod1+f" = "fullscreen toggle";
+
+          "Mod1+s" = "layout stacking";
+          "Mod1+w" = "layout tabbed";
+          "Mod1+e" = "layout toggle split";
+
+          "Mod1+Shift+space" = "floating toggle";
+
+          "Mod1+1" = "workspace 1";
+          "Mod1+2" = "workspace 2";
+          "Mod1+3" = "workspace 3";
+          "Mod1+4" = "workspace 4";
+          "Mod1+5" = "workspace 5";
+          "Mod1+6" = "workspace 6";
+          "Mod1+7" = "workspace 7";
+          "Mod1+8" = "workspace 8";
+          "Mod1+9" = "workspace 9";
+
+          "Mod1+Shift+1" = "move container to workspace 1";
+          "Mod1+Shift+2" = "move container to workspace 2";
+          "Mod1+Shift+3" = "move container to workspace 3";
+          "Mod1+Shift+4" = "move container to workspace 4";
+          "Mod1+Shift+5" = "move container to workspace 5";
+          "Mod1+Shift+6" = "move container to workspace 6";
+          "Mod1+Shift+7" = "move container to workspace 7";
+          "Mod1+Shift+8" = "move container to workspace 8";
+          "Mod1+Shift+9" = "move container to workspace 9";
+
+          "Mod1+Shift+c" = "reload";
+          "Mod1+Shift+r" = "restart";
+          "Mod1+Shift+e" = "exec i3-nagbar -t warning -m 'Do you want to exit i3?' -b 'Yes' 'i3-msg exit'";
+
+          "Mod1+r" = "mode resize";
+        };
+        defaultText = "Default i3 keybindings.";
+        description = ''
+          An attribute set that assignes keypress to an action.
+          Only basic keybinding is supported (bindsym keycomb action),
+          for more advanced setup use 'i3.extraConfig'.
+        '';
+        example = literalExample ''
+          {
+            "Mod1+Return" = "exec i3-sensible-terminal";
+            "Mod1+Shift+q" = "kill";
+            "Mod1+d" = "exec ${pkgs.dmenu}/bin/dmenu_run";
+          }
+        '';
+      };
+
+      colors = mkOption {
+        type = types.submodule {
+          options = {
+            background = mkOption {
+              type = types.string;
+              default = "#ffffff";
+              description = ''
+                Background color of the window. Only applications which do not cover
+                the whole area expose the color.
+              '';
+            };
+
+            focused = mkOption {
+              type = colorSetModule;
+              default = {
+                border = "#4c7899"; background = "#285577"; text = "#ffffff";
+                indicator = "#2e9ef4"; childBorder = "#285577";
+              };
+              description = "A window which currently has the focus.";
+            };
+
+            focusedInactive = mkOption {
+              type = colorSetModule;
+              default = {
+                border = "#333333"; background = "#5f676a"; text = "#ffffff";
+                indicator = "#484e50"; childBorder = "#5f676a";
+              };
+              description = ''
+                A window which is the focused one of its container,
+                but it does not have the focus at the moment.
+              '';
+            };
+
+            unfocused = mkOption {
+              type = colorSetModule;
+              default = {
+                border = "#333333"; background = "#222222"; text = "#888888";
+                indicator = "#292d2e"; childBorder = "#222222";
+              };
+              description = "A window which is not focused.";
+            };
+
+            urgent = mkOption {
+              type = colorSetModule;
+              default = {
+                border = "#2f343a"; background = "#900000"; text = "#ffffff";
+                indicator = "#900000"; childBorder = "#900000";
+              };
+              description = "A window which has its urgency hint activated.";
+            };
+
+            placeholder = mkOption {
+              type = colorSetModule;
+              default = {
+                border = "#000000"; background = "#0c0c0c"; text = "#ffffff";
+                indicator = "#000000"; childBorder = "#0c0c0c";
+              };
+              description = ''
+                Background and text color are used to draw placeholder window
+                contents (when restoring layouts). Border and indicator are ignored.
+              '';
+            };
+          };
+        };
+        default = {};
+        description = ''
+          Color settings. All color classes can be specified using submodules
+          with 'border', 'background', 'text', 'indicator' and 'childBorder' fields
+          and RGB color hex-codes as values. See default values for the reference.
+          Note that 'i3.config.colors.background' parameter takes a single RGB value.
+
+          See <link xlink:href="https://i3wm.org/docs/userguide.html#_changing_colors"/>.
+        '';
+      };
+
+      modes = mkOption {
+        type = types.attrsOf types.attrs;
+        default = {
+          resize = {
+            "Left" = "resize shrink width 10 px or 10 ppt";
+            "Down" = "resize grow height 10 px or 10 ppt";
+            "Up" = "resize shrink height 10 px or 10 ppt";
+            "Right" = "resize grow width 10 px or 10 ppt";
+            "Escape" = "mode default";
+          };
+        };
+        description = ''
+          An attribute set that defines binding modes and keybindings
+          inside them
+
+          Only basic keybinding is supported (bindsym keycomb action),
+          for more advanced setup use 'i3.extraConfig'.
+        '';
+      };
+
+      bars = mkOption {
+        type = types.listOf barModule;
+        default = [{}];
+        description = ''
+          i3 bars settings blocks. Set to empty list to remove bars completely.
+        '';
+      };
+
+      startup = mkOption {
+        type = types.listOf startupModule;
+        default = [];
+        description = ''
+          Commands that should be executed at startup.
+
+          See <link xlink:href="https://i3wm.org/docs/userguide.html#_automatically_starting_applications_on_i3_startup"/>.
+        '';
+        example = literalExample ''
+          [
+            { command = "systemctl --user restart polybar"; always = true; }
+            { command = "dropbox start"; }
+            { command = "firefox"; workspace = "1: web"; }
+          ];
+        '';
+      };
+
+      gaps = mkOption {
+        type = types.nullOr (types.submodule {
+          options = {
+            inner = mkOption {
+              type = types.nullOr types.int;
+              default = null;
+              description = "Inner gaps value.";
+              example = 12;
+            };
+
+            outer = mkOption {
+              type = types.nullOr types.int;
+              default = null;
+              description = "Outer gaps value.";
+              example = 5;
+            };
+
+            smartGaps = mkOption {
+              type = types.bool;
+              default = false;
+              description = ''
+                This option controls whether to disable all gaps (outer and inner)
+                on workspace with a single container.
+              '';
+              example = true;
+            };
+
+            smartBorders = mkOption {
+              type = types.enum [ "on" "off" "no_gaps" ];
+              default = null;
+              description = ''
+                This option controls whether to disable container borders on
+                workspace with a single container.
+              '';
+              example = true;
+            };
+          };
+        });
+        default = null;
+        description = ''
+          i3gaps related settings.
+          Note that i3-gaps package should be set for this options to take effect.
+        '';
+      };
+    };
+  };
+
+  keybindingsStr = keybindings: concatStringsSep "\n" (
+    mapAttrsToList (keycomb: action: "bindsym ${keycomb} ${action}") keybindings
+  );
+
+  colorSetStr = c: concatStringsSep " " [ c.border c.background c.text c.indicator c.childBorder ];
+
+  criteriaStr = criteria: "[${concatStringsSep " " (mapAttrsToList (k: v: ''${k}="${v}"'') criteria)}]";
+
+  modeStr = name: keybindings: ''
+    mode "${name}" {
+    ${keybindingsStr keybindings}
+    }
+  '';
+
+  assignStr = workspace: criteria: concatStringsSep "\n" (
+    map (c: "assign ${criteriaStr c} ${workspace}") criteria
+  );
+
+  barStr = { mode, hiddenState, position, workspaceButtons, statusCommand, ... }: ''
+    bar {
+      mode ${mode}
+      hidden_state ${hiddenState}
+      position ${position}
+      status_command ${statusCommand}
+      workspace_buttons ${if workspaceButtons then "yes" else "no"}
+    }
+  '';
+
+  gapsStr = with cfg.config.gaps; ''
+    ${optionalString (inner != null) "gaps inner ${toString inner}"}
+    ${optionalString (outer != null) "gaps outer ${toString outer}"}
+    ${optionalString smartGaps "smart_gaps on"}
+    ${optionalString (smartBorders != "off") "smart_borders ${smartBorders}"}
+  '';
+
+  floatingCriteriaStr = criteria: "for_window ${criteriaStr criteria} floating enable";
+
+  startupEntryStr = { command, always, workspace, ... }: ''
+    ${if always then "exec_always" else "exec"} --no-startup-id ${
+      if (workspace == null) then
+        command
+      else
+        "i3-msg 'workspace ${workspace}; exec ${command}'"
+    }
+  '';
+
+  configFile = pkgs.writeText "i3.conf" ((if cfg.config != null then with cfg.config; ''
+    font pango:${concatStringsSep ", " fonts}
+    floating_modifier ${floating.modifier}
+    new_window ${if window.titlebar then "normal" else "pixel"} ${toString window.border}
+    new_float ${if floating.titlebar then "normal" else "pixel"} ${toString floating.border}
+    force_focus_wrapping ${if focus.forceWrapping then "yes" else "no"}
+    focus_follows_mouse ${if focus.followMouse then "yes" else "no"}
+    focus_on_window_activation ${focus.newWindow}
+
+    client.focused ${colorSetStr colors.focused}
+    client.focused_inactive ${colorSetStr colors.focusedInactive}
+    client.unfocused ${colorSetStr colors.unfocused}
+    client.urgent ${colorSetStr colors.urgent}
+    client.placeholder ${colorSetStr colors.placeholder}
+    client.background ${colors.background}
+
+    ${keybindingsStr keybindings}
+    ${concatStringsSep "\n" (mapAttrsToList modeStr modes)}
+    ${concatStringsSep "\n" (mapAttrsToList assignStr assigns)}
+    ${concatStringsSep "\n" (map barStr bars)}
+    ${optionalString (gaps != null) gapsStr}
+    ${concatStringsSep "\n" (map floatingCriteriaStr floating.criteria)}
+    ${concatStringsSep "\n" (map startupEntryStr startup)}
+  '' else "") + "\n" + cfg.extraConfig);
+
+in
+
+{
+  options = {
+    xsession.windowManager.i3 = {
+      enable = mkEnableOption "i3 window manager.";
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.i3;
+        defaultText = "pkgs.i3";
+        example = "pkgs.i3-gaps";
+        description = ''
+          i3 package to use.
+          If 'i3.config.gaps' settings are specified, 'pkgs.i3-gaps' will be set as a default package.
+        '';
+      };
+
+      config = mkOption {
+        type = types.nullOr configModule;
+        default = {};
+        description = "i3 configuration options.";
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = "Extra configuration lines to add to ~/.config/i3/config.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    {
+      home.packages = [ cfg.package ];
+      xsession.windowManager.command = "${cfg.package}/bin/i3";
+      home.file.".config/i3/config".source = configFile;
+
+      home.activation.checkI3 = dagEntryBefore [ "linkGeneration" ] ''
+        if ! cmp --quiet \
+            "${configFile}" \
+            "$HOME/.config/i3/config"; then
+          i3Changed=1
+        fi
+      '';
+
+      home.activation.reloadI3 = dagEntryAfter [ "linkGeneration" ] ''
+        if [[ -v i3Changed && -v DISPLAY ]]; then
+          echo "Reloading i3"
+          ${cfg.package}/bin/i3-msg reload 1>/dev/null
+        fi
+      '';
+    }
+
+    (mkIf (cfg.config != null) {
+      xsession.windowManager.i3.package = mkDefault (
+        if (cfg.config.gaps != null) then pkgs.i3-gaps else pkgs.i3
+      );
+    })
+  ]);
+}