Use UTF-8 on Windows 10 Version 1903, fix #1195

Allows Ninja to use descriptions, filenames and environment variables
with characters outside of the ANSI codepage on Windows. Build manifests
are now UTF-8 by default (this change needs to be emphasized in the
release notes).

WriteConsoleOutput doesn't support UTF-8, but it's deprecated on newer
Windows 10 versions anyway (or as Microsoft likes to put it: "no longer
a part of our ecosystem roadmap"). We'll use the VT100 sequence just as
we do on Linux and macOS.

https://docs.microsoft.com/en-us/windows/uwp/design/globalizing/use-utf8-code-page
https://docs.microsoft.com/en-us/windows/console/writeconsoleoutput
https://docs.microsoft.com/de-de/windows/console/console-virtual-terminal-sequences

1 files changed, 20 insertions, 15 deletions

diff --git a/src/line_printer.cc b/src/line_printer.cc
index 68c58ad..3138960 100644
--- a/src/line_printer.cc
+++ b/src/line_printer.cc
@@ -87,22 +87,27 @@ void LinePrinter::Print(string to_print, LineType type) {
     GetConsoleScreenBufferInfo(console_, &csbi);
 
     to_print = ElideMiddle(to_print, static_cast<size_t>(csbi.dwSize.X));
-    // We don't want to have the cursor spamming back and forth, so instead of
-    // printf use WriteConsoleOutput which updates the contents of the buffer,
-    // but doesn't move the cursor position.
-    COORD buf_size = { csbi.dwSize.X, 1 };
-    COORD zero_zero = { 0, 0 };
-    SMALL_RECT target = {
-      csbi.dwCursorPosition.X, csbi.dwCursorPosition.Y,
-      static_cast<SHORT>(csbi.dwCursorPosition.X + csbi.dwSize.X - 1),
-      csbi.dwCursorPosition.Y
-    };
-    vector<CHAR_INFO> char_data(csbi.dwSize.X);
-    for (size_t i = 0; i < static_cast<size_t>(csbi.dwSize.X); ++i) {
-      char_data[i].Char.AsciiChar = i < to_print.size() ? to_print[i] : ' ';
-      char_data[i].Attributes = csbi.wAttributes;
+    if (supports_color_) {  // this means ENABLE_VIRTUAL_TERMINAL_PROCESSING
+                            // succeeded
+      printf("%s\x1B[K", to_print.c_str());  // Clear to end of line.
+      fflush(stdout);
+    } else {
+      // We don't want to have the cursor spamming back and forth, so instead of
+      // printf use WriteConsoleOutput which updates the contents of the buffer,
+      // but doesn't move the cursor position.
+      COORD buf_size = { csbi.dwSize.X, 1 };
+      COORD zero_zero = { 0, 0 };
+      SMALL_RECT target = { csbi.dwCursorPosition.X, csbi.dwCursorPosition.Y,
+                            static_cast<SHORT>(csbi.dwCursorPosition.X +
+                                               csbi.dwSize.X - 1),
+                            csbi.dwCursorPosition.Y };
+      vector<CHAR_INFO> char_data(csbi.dwSize.X);
+      for (size_t i = 0; i < static_cast<size_t>(csbi.dwSize.X); ++i) {
+        char_data[i].Char.AsciiChar = i < to_print.size() ? to_print[i] : ' ';
+        char_data[i].Attributes = csbi.wAttributes;
+      }
+      WriteConsoleOutput(console_, &char_data[0], buf_size, zero_zero, &target);
     }
-    WriteConsoleOutput(console_, &char_data[0], buf_size, zero_zero, &target);
 #else
     // Limit output to width of the terminal if provided so we don't cause
     // line-wrapping.