Yves Biener
91ac6241f4
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73 lines
2.1 KiB
Zig
73 lines
2.1 KiB
Zig
//! Helper function collection to provide ascii encodings for styling outputs.
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//! Stylings are implemented such that they can be nested in anyway to support
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//! multiple styles (i.e. bold and italic).
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//!
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//! Stylings however also include highlighting for specific terminal capabilities.
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//! For example url highlighting.
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// taken from https://github.com/rockorager/libvaxis/blob/main/src/Cell.zig (MIT-License)
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// with slight modifications
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const std = @import("std");
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const Color = @import("color.zig").Color;
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pub const Style = @This();
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pub const Underline = enum {
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off,
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single,
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double,
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curly,
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dotted,
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dashed,
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};
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pub const Emphasis = enum(u8) {
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reset = 0,
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bold = 1,
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dim,
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italic,
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underline,
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blink,
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invert = 7,
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hidden,
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strikethrough,
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};
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fg: Color = .default,
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bg: Color = .default,
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ul: Color = .default,
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ul_style: Underline = .off,
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emphasis: []const Emphasis,
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pub fn eql(this: Style, other: Style) bool {
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return std.meta.eql(this, other);
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}
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pub fn value(this: Style, writer: anytype, cp: u21) !void {
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var buffer: [4]u8 = undefined;
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const bytes = try std.unicode.utf8Encode(cp, &buffer);
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std.debug.assert(bytes > 0);
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// build ansi sequence for 256 colors ...
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// foreground
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try std.fmt.format(writer, "\x1b[", .{});
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try this.fg.write(writer, .fg);
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// background
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try std.fmt.format(writer, ";", .{});
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try this.bg.write(writer, .bg);
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// underline
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// FIX assert that if the underline property is set that the ul style and the attribute for underlining is available
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try std.fmt.format(writer, ";", .{});
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try this.ul.write(writer, .ul);
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// append styles (aka attributes like bold, italic, strikethrough, etc.)
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for (this.emphasis) |attribute| try std.fmt.format(writer, ";{d}", .{@intFromEnum(attribute)});
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try std.fmt.format(writer, "m", .{});
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// content
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try std.fmt.format(writer, "{s}", .{buffer[0..bytes]});
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try std.fmt.format(writer, "\x1b[0m", .{});
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}
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// TODO implement helper functions for terminal capabilities:
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// - links / url display (osc 8)
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// - show / hide cursor?
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