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-rw-r--r--lib/rake/trace_output.rb19
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/rake/trace_output.rb b/lib/rake/trace_output.rb
new file mode 100644
index 0000000000..e4d61cfb93
--- /dev/null
+++ b/lib/rake/trace_output.rb
@@ -0,0 +1,19 @@
+module Rake
+ module TraceOutput
+
+ # Write trace output to output stream +out+.
+ #
+ # The write is done as a single IO call (to print) to lessen the
+ # chance that the trace output is interrupted by other tasks also
+ # producing output.
+ def trace_on(out, *strings)
+ sep = $\ || "\n"
+ if strings.empty?
+ output = sep
+ else
+ output = strings.map { |s| s.end_with?(sep) ? s : s + sep }.join
+ end
+ out.print(output)
+ end
+ end
+end