Allow color API to enable and disable colors (#2111)

This is useful for front-ends which wish to selectively enable or
disable coloring.

Also expose these APIs from the C API.

Author: bollu

src/binaryen-c.cpp

@@ -26,6 +26,7 @@
 #include "ir/utils.h"
 #include "pass.h"
 #include "shell-interface.h"
+#include "support/colors.h"
 #include "wasm-binary.h"
 #include "wasm-builder.h"
 #include "wasm-interpreter.h"
@@ -3824,6 +3825,10 @@ BinaryenGetFunctionTypeBySignature(BinaryenModuleRef module,
   return NULL;
 }
 
+void BinaryenSetColorsEnabled(int enabled) { Colors::setEnabled(enabled); }
+
+int BinaryenAreColorsEnabled() { return Colors::isEnabled(); }
+
 #ifdef __EMSCRIPTEN__
 // Override atexit - we don't need any global ctors to actually run, and
 // otherwise we get clutter in the output in debug builds

src/binaryen-c.h

@@ -1221,6 +1221,11 @@ BinaryenGetFunctionTypeBySignature(BinaryenModuleRef module,
                                    BinaryenType* paramTypes,
                                    BinaryenIndex numParams);
 
+// Enable or disable coloring for the WASM printer
+void BinaryenSetColorsEnabled(int enabled);
+
+// Query whether color is enable for the WASM printer
+int BinaryenAreColorsEnabled();
 #ifdef __cplusplus
 } // extern "C"
 #endif

src/passes/pass.cpp

@@ -428,7 +428,7 @@ static void dumpWast(Name name, Module* wasm) {
   fullName += std::to_string(getpid()) + '-';
 #endif
   fullName += numstr + "-" + name.str + ".wasm";
-  Colors::disable();
+  Colors::setEnabled(false);
   ModuleWriter writer;
   writer.setBinary(false); // TODO: add an option for binary
   writer.write(*wasm, fullName);

src/support/colors.cpp

@@ -20,10 +20,11 @@
 #include <ostream>
 
 namespace {
-bool colors_disabled = false;
+bool colors_enabled = true;
 } // anonymous namespace
 
-void Colors::disable() { colors_disabled = true; }
+void Colors::setEnabled(bool enabled) { colors_enabled = enabled; }
+bool Colors::isEnabled() { return colors_enabled; }
 
 #if defined(__linux__) || defined(__APPLE__)
 #include <unistd.h>
@@ -34,7 +35,7 @@ void Colors::outputColorCode(std::ostream& stream, const char* colorCode) {
            (isatty(STDOUT_FILENO) &&
             (!getenv("COLORS") || getenv("COLORS")[0] != '0')); // implicit
   }();
-  if (has_color && !colors_disabled) {
+  if (has_color && colors_enabled) {
     stream << colorCode;
   }
 }
@@ -50,7 +51,7 @@ void Colors::outputColorCode(std::ostream& stream, const WORD& colorCode) {
   }();
   static HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
   static HANDLE hStderr = GetStdHandle(STD_ERROR_HANDLE);
-  if (has_color && !colors_disabled)
+  if (has_color && colors_enabled)
     SetConsoleTextAttribute(&stream == &std::cout ? hStdout : hStderr,
                             colorCode);
 }

src/support/colors.h

@@ -20,7 +20,8 @@
 #include <iosfwd>
 
 namespace Colors {
-void disable();
+void setEnabled(bool enabled);
+bool isEnabled();
 
 #if defined(__linux__) || defined(__APPLE__)
 void outputColorCode(std::ostream& stream, const char* colorCode);

src/tools/asm2wasm.cpp

@@ -53,7 +53,7 @@ int main(int argc, const char* argv[]) {
          Options::Arguments::One,
          [](Options* o, const std::string& argument) {
            o->extra["output"] = argument;
-           Colors::disable();
+           Colors::setEnabled(false);
          })
     .add(
       "--mapped-globals",

src/tools/wasm-as.cpp

@@ -46,7 +46,7 @@ int main(int argc, const char* argv[]) {
          Options::Arguments::One,
          [](Options* o, const std::string& argument) {
            o->extra["output"] = argument;
-           Colors::disable();
+           Colors::setEnabled(false);
          })
     .add("--validate",
          "-v",

src/tools/wasm-ctor-eval.cpp

@@ -408,7 +408,7 @@ int main(int argc, const char* argv[]) {
          Options::Arguments::One,
          [](Options* o, const std::string& argument) {
            o->extra["output"] = argument;
-           Colors::disable();
+           Colors::setEnabled(false);
          })
     .add("--emit-text",
          "-S",

src/tools/wasm-dis.cpp

@@ -39,7 +39,7 @@ int main(int argc, const char* argv[]) {
          Options::Arguments::One,
          [](Options* o, const std::string& argument) {
            o->extra["output"] = argument;
-           Colors::disable();
+           Colors::setEnabled(false);
          })
     .add(
       "--source-map",

src/tools/wasm-emscripten-finalize.cpp

@@ -59,7 +59,7 @@ int main(int argc, const char* argv[]) {
          Options::Arguments::One,
          [&outfile](Options*, const std::string& argument) {
            outfile = argument;
-           Colors::disable();
+           Colors::setEnabled(false);
          })
     .add("--debuginfo",
          "-g",