command/input: support globs

doc/riverctl.1.scd

@@ -465,6 +465,8 @@ The _input_ command can be used to create a configuration rule for an input
 device identified by its _name_.
 The _name_ of an input device consists of its type, its numerical vendor id,
 its numerical product id and finally its self-advertised name, separated by -.
+Simple globbing patterns are supported, see the rules section for further
+information on globs.
 
 A list of all device properties that can be configured may be found below.
 However note that not every input device supports every property.

river/InputConfig.zig

@@ -262,7 +262,7 @@ pub const ScrollButton = struct {
     }
 };
 
-identifier: []const u8,
+glob: []const u8,
 
 // Note: Field names equal name of the setting in the 'input' command.
 events: ?EventState = null,
@@ -281,15 +281,15 @@ tap: ?TapState = null,
 @"scroll-button": ?ScrollButton = null,
 
 pub fn deinit(self: *Self) void {
-    util.gpa.free(self.identifier);
+    util.gpa.free(self.glob);
 }
 
-pub fn apply(self: *Self, device: *InputDevice) void {
+pub fn apply(self: *const Self, device: *InputDevice) void {
     const libinput_device: *c.libinput_device = @ptrCast(device.wlr_device.getLibinputDevice() orelse return);
-    log.debug("applying input configuration to device: {s}", .{device.identifier});
+    log.debug("applying input configuration '{s}' to device '{s}'.", .{ self.glob, device.identifier });
 
     inline for (@typeInfo(Self).Struct.fields) |field| {
-        if (comptime mem.eql(u8, field.name, "identifier")) continue;
+        if (comptime mem.eql(u8, field.name, "glob")) continue;
 
         if (@field(self, field.name)) |setting| {
             log.debug("applying setting: {s}", .{field.name});
@@ -300,7 +300,7 @@ pub fn apply(self: *Self, device: *InputDevice) void {
 
 pub fn parse(self: *Self, setting: []const u8, value: []const u8) !void {
     inline for (@typeInfo(Self).Struct.fields) |field| {
-        if (comptime mem.eql(u8, field.name, "identifier")) continue;
+        if (comptime mem.eql(u8, field.name, "glob")) continue;
 
         if (mem.eql(u8, setting, field.name)) {
             // Special-case the settings which are not enums.
@@ -329,10 +329,10 @@ pub fn parse(self: *Self, setting: []const u8, value: []const u8) !void {
 }
 
 pub fn write(self: *Self, writer: anytype) !void {
-    try writer.print("{s}\n", .{self.identifier});
+    try writer.print("{s}\n", .{self.glob});
 
     inline for (@typeInfo(Self).Struct.fields) |field| {
-        if (comptime mem.eql(u8, field.name, "identifier")) continue;
+        if (comptime mem.eql(u8, field.name, "glob")) continue;
         if (@field(self, field.name)) |setting| {
             // Special-case the settings which are not enums.
             if (comptime mem.eql(u8, field.name, "pointer-accel")) {

river/InputDevice.zig

@@ -22,6 +22,8 @@ const ascii = std.ascii;
 const wlr = @import("wlroots");
 const wl = @import("wayland").server.wl;
 
+const globber = @import("globber");
+
 const server = &@import("main.zig").server;
 const util = @import("util.zig");
 
@@ -82,7 +84,7 @@ pub fn init(device: *InputDevice, seat: *Seat, wlr_device: *wlr.InputDevice) !vo
     if (!isKeyboardGroup(wlr_device)) {
         // Apply any matching input device configuration.
         for (server.input_manager.configs.items) |*input_config| {
-            if (mem.eql(u8, input_config.identifier, identifier)) {
+            if (globber.match(identifier, input_config.glob)) {
                 input_config.apply(device);
             }
         }

river/InputManager.zig

@@ -49,7 +49,10 @@ pointer_constraints: *wlr.PointerConstraintsV1,
 input_method_manager: *wlr.InputMethodManagerV2,
 text_input_manager: *wlr.TextInputManagerV3,
 
+/// List of input device configurations. Ordered by glob generality, with
+/// the most general towards the start and the most specific towards the end.
 configs: std.ArrayList(InputConfig),
+
 devices: wl.list.Head(InputDevice, .link),
 seats: std.TailQueue(Seat) = .{},
 

river/command/input.zig

@@ -16,6 +16,11 @@
 
 const std = @import("std");
 const mem = std.mem;
+const meta = std.meta;
+const math = std.math;
+const sort = std.sort;
+
+const globber = @import("globber");
 
 const server = &@import("../main.zig").server;
 const util = @import("../util.zig");
@@ -39,7 +44,7 @@ pub fn listInputs(
     var it = server.input_manager.devices.iterator(.forward);
     while (it.next()) |device| {
         const configured = for (server.input_manager.configs.items) |*input_config| {
-            if (mem.eql(u8, input_config.identifier, device.identifier)) {
+            if (globber.match(device.identifier, input_config.glob)) {
                 break true;
             }
         } else false;
@@ -82,36 +87,50 @@ pub fn input(
     if (args.len < 4) return Error.NotEnoughArguments;
     if (args.len > 4) return Error.TooManyArguments;
 
-    // Try to find an existing InputConfig with matching identifier, or create
+    try globber.validate(args[1]);
+
+    // Try to find an existing InputConfig with matching glob pattern, or create
     // a new one if none was found.
-    const input_config = for (server.input_manager.configs.items) |*input_config| {
-        if (mem.eql(u8, input_config.identifier, args[1])) {
+    for (server.input_manager.configs.items) |*input_config| {
+        if (mem.eql(u8, input_config.glob, args[1])) {
             try input_config.parse(args[2], args[3]);
-            break input_config;
         }
-    } else blk: {
-        const identifier_owned = try util.gpa.dupe(u8, args[1]);
-        errdefer util.gpa.free(identifier_owned);
+    } else {
+        const glob_owned = try util.gpa.dupe(u8, args[1]);
+        errdefer util.gpa.free(glob_owned);
 
         try server.input_manager.configs.ensureUnusedCapacity(1);
         const input_config = server.input_manager.configs.addOneAssumeCapacity();
         errdefer _ = server.input_manager.configs.pop();
 
         input_config.* = .{
-            .identifier = identifier_owned,
+            .glob = glob_owned,
         };
         try input_config.parse(args[2], args[3]);
+    }
 
-        break :blk input_config;
-    };
+    // Sort input configs by generality.
+    sort.insertion(InputConfig, server.input_manager.configs.items, {}, lessThan);
 
-    // Update matching existing input devices.
+    // We need to update all input device matching the glob. The user may
+    // add an input configuration at an arbitrary position in the generality
+    // ordered list, so the simplest way to ensure the device is configured
+    // correctly is to apply all input configurations again, in order.
     var it = server.input_manager.devices.iterator(.forward);
     while (it.next()) |device| {
-        if (mem.eql(u8, device.identifier, args[1])) {
-            input_config.apply(device);
-            // We don't break here because it is common to have multiple input
-            // devices with the same identifier.
+        // Device does not match the glob given in the command, so its
+        // configuration state after applying all configs again would be
+        // the same.
+        if (!globber.match(device.identifier, args[1])) continue;
+
+        for (server.input_manager.configs.items) |ic| {
+            if (globber.match(device.identifier, ic.glob)) {
+                ic.apply(device);
+            }
         }
     }
 }
+
+fn lessThan(_: void, a: InputConfig, b: InputConfig) bool {
+    return globber.order(a.glob, b.glob) == .gt;
+}