Implement some more environment functions for WASI.

1 files changed, 16 insertions, 15 deletions

diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 44310de261..983d088374 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -110,27 +110,28 @@ pub fn getSelfDebugInfo() !*DebugInfo {
 }
 
 pub fn detectTTYConfig(file: std.fs.File) TTY.Config {
-    if (process.hasEnvVarConstant("ZIG_DEBUG_COLOR")) {
+    if (builtin.os.tag == .wasi) {
+        // Per https://github.com/WebAssembly/WASI/issues/162 ANSI codes
+        // aren't currently supported.
+        return .no_color;
+    } else if (process.hasEnvVarConstant("ZIG_DEBUG_COLOR")) {
         return .escape_codes;
     } else if (process.hasEnvVarConstant("NO_COLOR")) {
         return .no_color;
-    } else {
-        if (file.supportsAnsiEscapeCodes()) {
-            return .escape_codes;
-        } else if (native_os == .windows and file.isTty()) {
-            var info: windows.CONSOLE_SCREEN_BUFFER_INFO = undefined;
-            if (windows.kernel32.GetConsoleScreenBufferInfo(file.handle, &info) != windows.TRUE) {
-                // TODO: Should this return an error instead?
-                return .no_color;
-            }
-            return .{ .windows_api = .{
-                .handle = file.handle,
-                .reset_attributes = info.wAttributes,
-            } };
-        } else {
+    } else if (file.supportsAnsiEscapeCodes()) {
+        return .escape_codes;
+    } else if (native_os == .windows and file.isTty()) {
+        var info: windows.CONSOLE_SCREEN_BUFFER_INFO = undefined;
+        if (windows.kernel32.GetConsoleScreenBufferInfo(file.handle, &info) != windows.TRUE) {
+            // TODO: Should this return an error instead?
             return .no_color;
         }
+        return .{ .windows_api = .{
+            .handle = file.handle,
+            .reset_attributes = info.wAttributes,
+        } };
     }
+    return .no_color;
 }
 
 /// Tries to print the current stack trace to stderr, unbuffered, and ignores any error returned.