std: rework TTY detection and printing

This commit sketches an idea for how to deal with detection of file
streams as being terminals.

When a File stream is a terminal, writes through the stream should have
their escapes stripped unless the programmer explicitly enables terminal
escapes. Furthermore, the programmer needs a convenient API for
intentionally outputting escapes into the stream. In particular it
should be possible to set colors that are silently discarded when the
stream is not a terminal.

This commit makes `Io.File.Writer` track the terminal mode in the
already-existing `mode` field, making it the appropriate place to
implement escape stripping.

`Io.lockStderrWriter` returns a `*Io.File.Writer` with terminal
detection already done by default. This is a higher-level application
layer stream for writing to stderr.

Meanwhile, `std.debug.lockStderrWriter` also returns a `*Io.File.Writer`
but a lower-level one that is hard-coded to use a static single-threaded
`std.Io.Threaded` instance. This is the same instance that is used for
collecting debug information and iterating the unwind info.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/main.zig b/src/main.zig
index bb940a1fe7..2eebb6d060 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -247,8 +247,6 @@ fn mainArgs(gpa: Allocator, arena: Allocator, args: []const []const u8) !void {
     threaded.stack_size = thread_stack_size;
     const io = threaded.io();
 
-    debug_allocator.tty_config = .detect(io, .stderr());
-
     const cmd = args[1];
     const cmd_args = args[2..];
     if (mem.eql(u8, cmd, "build-exe")) {