From ffcbd48a1220ce6d652ee762001d88baa385de49 Mon Sep 17 00:00:00 2001 From: Andrew Kelley Date: Tue, 9 Dec 2025 22:10:12 -0800 Subject: 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. --- lib/std/process.zig | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'lib/std/process.zig') diff --git a/lib/std/process.zig b/lib/std/process.zig index f7ecf5fdc2..5c6e6f89eb 100644 --- a/lib/std/process.zig +++ b/lib/std/process.zig @@ -439,25 +439,25 @@ pub fn getEnvVarOwned(allocator: Allocator, key: []const u8) GetEnvVarOwnedError } /// On Windows, `key` must be valid WTF-8. -pub fn hasEnvVarConstant(comptime key: []const u8) bool { +pub inline fn hasEnvVarConstant(comptime key: []const u8) bool { if (native_os == .windows) { const key_w = comptime unicode.wtf8ToWtf16LeStringLiteral(key); return getenvW(key_w) != null; } else if (native_os == .wasi and !builtin.link_libc) { - @compileError("hasEnvVarConstant is not supported for WASI without libc"); + return false; } else { return posix.getenv(key) != null; } } /// On Windows, `key` must be valid WTF-8. -pub fn hasNonEmptyEnvVarConstant(comptime key: []const u8) bool { +pub inline fn hasNonEmptyEnvVarConstant(comptime key: []const u8) bool { if (native_os == .windows) { const key_w = comptime unicode.wtf8ToWtf16LeStringLiteral(key); const value = getenvW(key_w) orelse return false; return value.len != 0; } else if (native_os == .wasi and !builtin.link_libc) { - @compileError("hasNonEmptyEnvVarConstant is not supported for WASI without libc"); + return false; } else { const value = posix.getenv(key) orelse return false; return value.len != 0; -- cgit v1.2.3