NINJA_STATUS: add support of `%p` for percentage

2 files changed, 9 insertions, 0 deletions

diff --git a/doc/manual.asciidoc b/doc/manual.asciidoc
index 666f0a5..42e5452 100644
--- a/doc/manual.asciidoc
+++ b/doc/manual.asciidoc
@@ -215,6 +215,7 @@ Ninja supports one environment variable to control its behavior.
 Several placeholders are available:
 * `%s`: The number of started edges.
 * `%t`: The total number of edges that must be run to complete the build.
+* `%p`: The percentage of started edges.
 * `%r`: The number of currently running edges.
 * `%u`: The number of remaining edges to start.
 * `%f`: The number of finished edges.
diff --git a/src/build.cc b/src/build.cc
index 93ab10d..e5429cf 100644
--- a/src/build.cc
+++ b/src/build.cc
@@ -179,6 +179,7 @@ string BuildStatus::FormatProgressStatus(
     const char* progress_status_format) const {
   string out;
   char buf[32];
+  int percent;
   for (const char* s = progress_status_format; *s != '\0'; ++s) {
     if (*s == '%') {
       ++s;
@@ -231,6 +232,13 @@ string BuildStatus::FormatProgressStatus(
         out += buf;
         break;
 
+        // Percentage
+      case 'p':
+        percent = (100 * started_edges_) / total_edges_;
+        snprintf(buf, sizeof(buf), "%3i%%", percent);
+        out += buf;
+        break;
+
       default:
         Fatal("unknown placeholder '%%%c' in $NINJA_STATUS", *s);
         return "";