From dc4f80f3acfdc6a98a543b535a9cb31823ed2835 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Mon, 7 Aug 2006 16:09:15 +0000
Subject: Added support for setting and adding the output of commands to
 variables.

---
 src/build.y     |  8 ++++++++
 src/builder.cpp | 24 ++++++++++++++++++++++++
 src/builder.h   |  2 ++
 3 files changed, 34 insertions(+)

diff --git a/src/build.y b/src/build.y
index d8cba53..d1f3945 100644
--- a/src/build.y
+++ b/src/build.y
@@ -212,6 +212,14 @@ setexpr: STRING '=' STRING
 	     {
 			 bld.varAddSet( $1, $3 );
 		 }
+	   | STRING '=' TOK_FROM TOK_COMMAND STRING
+	     {
+			 bld.varSet( $1, bld.cmdToString( $5 ).c_str() );
+		 }
+	   | STRING TOK_ADDSET TOK_FROM TOK_COMMAND STRING
+	     {
+			 bld.varSet( $1, bld.cmdToString( $5 ).c_str() );
+		 }
 	   ;
 
 rule: TOK_RULE STRING
diff --git a/src/builder.cpp b/src/builder.cpp
index 8fd72bb..8c3bbbb 100644
--- a/src/builder.cpp
+++ b/src/builder.cpp
@@ -799,3 +799,27 @@ std::list<std::string> Builder::findTargets( const char *sRegex )
 	return lTmp;
 }
 
+std::string Builder::cmdToString( const char *sCmd )
+{
+	std::string buf;
+	FILE *pr = popen( sCmd, "r" );
+	if( pr == NULL )
+		throw BuildException("Couldn't execute program \"%s\"", sCmd );
+
+	char cbuf[2048];
+
+	for(;;)
+	{
+		int nRead = fread( cbuf, 1, 2048, pr );
+		for( int j = 0; j < nRead; j++ )
+			if( cbuf[j] != '\n' && cbuf[j] != '\r' )
+				buf.append( cbuf+j, 1 );
+		if( feof( pr ) )
+			break;
+	}
+
+	pclose( pr );
+
+	return buf;
+}
+
diff --git a/src/builder.h b/src/builder.h
index 195296a..c570dbb 100644
--- a/src/builder.h
+++ b/src/builder.h
@@ -137,6 +137,8 @@ public:
 	void regexVars( RegExp *re, varmap &map );
 	std::string varRepl( const char *sSrc, const char *cont, varmap *mExtra );
 
+	std::string cmdToString( const char *sCmd );
+
 private:
 	void requiresNormal( const char *sBase, const char *sReq );
 	void requiresRegexp( const char *sBase, const char *sReq );
-- 
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