add basic emotion topic

Makefile

@@ -22,9 +22,11 @@ uninstall:
 	rm $(DESTDIR)$(PREFIX)/bin/journal
 
 # currently we only have one journal util, others may come later
-journal: src/journal/main.o
-	$(CC) $(LDFLAGS) -o bin/journal src/journal/main.o $(LDLIBS)
+journal: src/journal/main.o src/journal/emotion.o
+	$(CC) $(LDFLAGS) -o bin/journal \
+	    src/journal/main.o src/journal/emotion.o $(LDLIBS)
 
+src/journal/emotion.o: src/journal/emotion.c
 src/journal/main.o: src/journal/main.c
 
 clean:
@@ -32,6 +34,4 @@ clean:
 
 .SUFFIXES: .c .o
 .c.o:
-	# $< mean the prereqs
-	# $@ means the target
 	$(CC) $(CFLAGS) -c $< -o $@

src/journal/emotion.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+void handle_emotion()
+{
+    printf("test\n");
+    return;
+}

src/journal/emotion.h

@@ -0,0 +1,6 @@
+#ifndef __EMOTION_H__
+#define __EMOTION_H__
+
+void handle_emotion();
+
+#endif

src/journal/main.c

@@ -1,4 +1,9 @@
 #include <stdio.h>
+#include <string.h>
+
+#include "emotion.h"
+
+#define TOPICS 10
 
 int main(int argc, char** argv)
 {
@@ -9,7 +14,28 @@ int main(int argc, char** argv)
     }
 
     char *topic = argv[1];
-    printf("%s\n", topic);
+    printf("load topic %s\n", topic);
+
+    const char* topics[TOPICS] = {
+        "emotion"
+    };
+
+    void (*handlers[])() = {
+        handle_emotion,
+    };
+
+    for(int i = 0; i < TOPICS; i++)
+    {
+        const char* cur_topic = topics[i];
+        if(strcmp(topic, cur_topic) == 0)
+        {
+            void (*fun_ptr)() = handlers[i];
+            fun_ptr();
+            return 0;
+        }
+    }
+
+    printf("topic %s not found\n", topic);
     return 0;
 }