Align all edge numbers to same length when formatting output

So when updating status output on terminal, make sure that all numbers will
be always aligned at same length. Even if progress variables change number
of characters.

src/build.cc

@@ -160,6 +160,9 @@ string BuildStatus::FormatProgressStatus(
   string out;
   char buf[32];
   int percent;
+  char total_edges_str[32];
+  snprintf(total_edges_str, sizeof(total_edges_str), "%d", total_edges_);
+  int total_edges_len = strlen(total_edges_str);
   for (const char* s = progress_status_format; *s != '\0'; ++s) {
     if (*s == '%') {
       ++s;
@@ -170,31 +173,30 @@ string BuildStatus::FormatProgressStatus(
 
         // Started edges.
       case 's':
-        snprintf(buf, sizeof(buf), "%d", started_edges_);
+        snprintf(buf, sizeof(buf), "%*d", total_edges_len, started_edges_);
         out += buf;
         break;
 
         // Total edges.
       case 't':
-        snprintf(buf, sizeof(buf), "%d", total_edges_);
-        out += buf;
+        out += total_edges_str;
         break;
 
         // Running edges.
       case 'r':
-        snprintf(buf, sizeof(buf), "%d", started_edges_ - finished_edges_);
+        snprintf(buf, sizeof(buf), "%*d", total_edges_len, started_edges_ - finished_edges_);
         out += buf;
         break;
 
         // Unstarted edges.
       case 'u':
-        snprintf(buf, sizeof(buf), "%d", total_edges_ - started_edges_);
+        snprintf(buf, sizeof(buf), "%*d", total_edges_len, total_edges_ - started_edges_);
         out += buf;
         break;
 
         // Finished edges.
       case 'f':
-        snprintf(buf, sizeof(buf), "%d", finished_edges_);
+        snprintf(buf, sizeof(buf), "%*d", total_edges_len, finished_edges_);
         out += buf;
         break;