From 4d0ab515cc4142b22247e26f1b57b5cd0a6b31d5 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Mon, 1 Dec 2014 07:53:29 -0700
Subject: Added "--sum" command line option.

Reads in a list of numbers on standard in, one per line, and sums them.
---
 src/options.cpp | 19 +++++++++++++++++++
 src/options.h   |  1 +
 2 files changed, 20 insertions(+)

diff --git a/src/options.cpp b/src/options.cpp
index d9d34fa..d88df3b 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -8,6 +8,7 @@
 #include "lexer.h"
 #include "parser.h"
 
+#include <bu/streamstack.h>
 #include <bu/sio.h>
 #include <stdlib.h>
 
@@ -36,6 +37,8 @@ Options::Options( int argc, char *argv[] ) :
         "use all remaining parameters as the equation (you may wish to quote "
         "your equation to prevent special characters from being interpreted by "
         "your shell).");
+    addOption( Bu::slot(this, &Options::sum), "sum",
+        "Read numbers from standard input and sum them, output the result.");
     addOption( Bu::slot(this, &Options::version), 'v', "version",
         "Show the version string ('" CLIC_VERSION_STR "')");
     addHelpOption('h', "help", "This help");
@@ -198,6 +201,22 @@ int Options::execute( Bu::StringArray aArgs )
     return aArgs.getSize();
 }
 
+int Options::sum( Bu::StringArray aArgs )
+{
+    Number sum( iScale, iRadix );
+    while( !Bu::sioRaw.isEos() )
+    {
+        Bu::String s = Bu::sioRaw.readLine();
+        if( s.isEmpty() )
+            break;
+        Number n( s, iScale, iRadix );
+        sum = sum + n;
+    }
+    Bu::println("%1").arg( sum );
+    exit( 0 );
+    return 0;
+}
+
 int Options::version( Bu::StringArray aArgs )
 {
     Bu::println( CLIC_VERSION_STR );
diff --git a/src/options.h b/src/options.h
index 9afa0ac..f3f59a6 100644
--- a/src/options.h
+++ b/src/options.h
@@ -18,6 +18,7 @@ private:
     int isPrime( Bu::StringArray aArgs );
     int convert( Bu::StringArray aArgs );
     int execute( Bu::StringArray aArgs );
+    int sum( Bu::StringArray aArgs );
     int version( Bu::StringArray aArgs );
 
     int iScale;
-- 
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