chor: use new Writer interface for terminal's Writer; fix test cases

src/style.zig

@@ -42,27 +42,27 @@ pub fn eql(this: Style, other: Style) bool {
 
 // TODO might be useful to use the std.ascii stuff!
 
-pub fn value(this: Style, writer: anytype, cp: u21) !void {
+pub fn value(this: Style, writer: *std.Io.Writer, cp: u21) !void {
     var buffer: [4]u8 = undefined;
     const bytes = try unicode.utf8Encode(cp, &buffer);
     assert(bytes > 0);
     // build ansi sequence for 256 colors ...
     // foreground
-    try format(writer, "\x1b[", .{});
+    try writer.printAscii("\x1b[", .{});
     try this.fg.write(writer, .fg);
     // background
-    try format(writer, ";", .{});
+    try writer.printAsciiChar(';', .{});
     try this.bg.write(writer, .bg);
     // underline
     // FIX assert that if the underline property is set that the ul style and the attribute for underlining is available
-    try format(writer, ";", .{});
+    try writer.printAsciiChar(';', .{});
     try this.ul.write(writer, .ul);
     // append styles (aka attributes like bold, italic, strikethrough, etc.)
-    for (this.emphasis) |attribute| try format(writer, ";{d}", .{@intFromEnum(attribute)});
-    try format(writer, "m", .{});
+    for (this.emphasis) |attribute| try writer.print(";{d}", .{@intFromEnum(attribute)});
+    try writer.printAsciiChar('m', .{});
     // content
-    try format(writer, "{s}", .{buffer[0..bytes]});
-    try format(writer, "\x1b[0m", .{});
+    try writer.printAscii(buffer[0..bytes], .{});
+    try writer.printAscii("\x1b[0m", .{});
 }
 
 // TODO implement helper functions for terminal capabilities:
@@ -73,6 +73,5 @@ const std = @import("std");
 const unicode = std.unicode;
 const meta = std.meta;
 const assert = std.debug.assert;
-const format = std.fmt.format;
 const Color = @import("color.zig").Color;
 const Style = @This();