tiny.sys.x11.display

1const std = @import("std");23pub const ParseError = error{4    MissingDisplay,5    RemoteDisplayUnsupported,6    InvalidDisplay,7};89pub const Target = struct {10    display: u32,11    screen: u32,1213    pub fn socketPath(self: Target, buffer: []u8) ![]const u8 {14        return std.fmt.bufPrint(buffer, "/tmp/.X11-unix/X{d}", .{self.display});15    }16};1718pub fn parse(value: ?[]const u8) ParseError!Target {19    const raw = value orelse return error.MissingDisplay;20    if (raw.len == 0) return error.MissingDisplay;2122    var rest = raw;23    if (std.mem.indexOfScalar(u8, rest, ':')) |colon| {24        const host = rest[0..colon];25        if (host.len != 0 and !std.mem.eql(u8, host, "unix")) {26            return error.RemoteDisplayUnsupported;27        }28        rest = rest[colon + 1 ..];29    } else {30        return error.InvalidDisplay;31    }3233    var display_part = rest;34    var screen_part: []const u8 = "";35    if (std.mem.indexOfScalar(u8, rest, '.')) |dot| {36        display_part = rest[0..dot];37        screen_part = rest[dot + 1 ..];38    }3940    const display = std.fmt.parseInt(u32, display_part, 10) catch return error.InvalidDisplay;41    const screen = if (screen_part.len == 0)42        043    else44        std.fmt.parseInt(u32, screen_part, 10) catch return error.InvalidDisplay;4546    return .{ .display = display, .screen = screen };47}4849test "parse accepts local display forms" {50    try std.testing.expectEqual(Target{ .display = 0, .screen = 0 }, try parse(":0"));51    try std.testing.expectEqual(Target{ .display = 1, .screen = 0 }, try parse(":1"));52    try std.testing.expectEqual(Target{ .display = 0, .screen = 2 }, try parse(":0.2"));53    try std.testing.expectEqual(Target{ .display = 10, .screen = 0 }, try parse("unix:10"));54}5556test "parse rejects remote and malformed displays" {57    try std.testing.expectError(error.MissingDisplay, parse(null));58    try std.testing.expectError(error.MissingDisplay, parse(""));59    try std.testing.expectError(error.RemoteDisplayUnsupported, parse("remote.host:0"));60    try std.testing.expectError(error.InvalidDisplay, parse("0"));61    try std.testing.expectError(error.InvalidDisplay, parse(":zero"));62}6364test "socket path names the abstract unix socket" {65    var buffer: [64]u8 = undefined;66    const target = try parse(":1");67    try std.testing.expectEqualStrings("/tmp/.X11-unix/X1", try target.socketPath(&buffer));68}

1pub const display = @import("display.zig");