From cce63aca270c51fb3ce9790438e3c23864de0a87 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 23 Dec 2015 21:43:51 +0100
Subject: Implement file change tracking using `diff`

The newly introduced `ChangeTracker` class is now keeping track of all tracked file in addition to spawning and managing a corresponding `diff` instance that enables printing pretty _patch-style_ change summaries to the logging target.

This commit introduces `boost-process` and `diff` as dependencies of this library.
---
 src/utility.h | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'src/utility.h')

diff --git a/src/utility.h b/src/utility.h
index 96ee15c..1dc44ed 100644
--- a/src/utility.h
+++ b/src/utility.h
@@ -3,6 +3,8 @@
 
 #include <ext/stdio_filebuf.h>
 
+#include <boost/process.hpp>
+
 #include <iostream>
 
 namespace utility {
@@ -10,16 +12,30 @@ namespace utility {
 class Logger {
 	public:
 		Logger(const int target_fd):
-			buffer(target_fd, std::ios::out),
-			stream(&this->buffer) { }
+			buffer_(target_fd, std::ios::out),
+			stream_(&this->buffer) { }
 
 		void append(const std::string& msg) {
-			this->stream << msg << std::endl;
+			this->stream_ << msg << std::endl;
+		}
+
+		// Forward the contents of a given standard output stream to the log target
+		//
+		// While `this->stream_ << stream.rdbuf()` would be more effective it sadly
+		// does not work with `boost::process::pistream` due to a broken pipe error
+		// in conjunction with the required `boost::process::capture_stream` context
+		// flag.
+		//
+		void forward(boost::process::pistream& stream) {
+			this->stream << std::string(
+				(std::istreambuf_iterator<char>(stream)),
+				(std::istreambuf_iterator<char>())
+			);
 		}
 
 	private:
-		__gnu_cxx::stdio_filebuf<char> buffer;
-		std::ostream                   stream;
+		__gnu_cxx::stdio_filebuf<char> buffer_;
+		std::ostream                   stream_;
 
 };
 
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