fix: don't invoke if no args

src/command.c

@@ -3,11 +3,9 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-#include "parse.h"
-
 unsigned char invoke(struct Args args) {
   pid_t child = fork();
-  if (child == 0 && args.argc > 0) {
+  if (child == 0) {
     execvp(args.argv[0], args.argv);
     return 1;
   }

src/command.h

@@ -1,7 +1,13 @@
 #ifndef COMMAND_H
 #define COMMAND_H
 
-#include "parse.h"
+#include <sys/types.h>
+
+struct Args {
+  unsigned int argc;
+  size_t argv_size;
+  char **argv;
+};
 
 unsigned char invoke(struct Args args);
 

src/main.c

@@ -18,6 +18,19 @@ int main() {
     struct Args args = parse(input_line);
     free(input_line);
 
-    invoke(args);
+    if (args.argc > 0) {
+      invoke(args);
+    }
+
+    {
+      unsigned int i = 0;
+      while (i < args.argc) {
+        free(args.argv[i]);
+        i++;
+      }
+    }
+    if (args.argv != NULL) {
+      free(args.argv);
+    }
   }
 }

src/parse.c

@@ -48,6 +48,7 @@ struct Args parse(char *line) {
   struct Args args;
   args.argc = 0;
   args.argv_size = 0;
+  args.argv = NULL;
 
   parse_worker(&args, line, 0, line);
 

src/parse.h

@@ -1,13 +1,7 @@
 #ifndef PARSE_H
 #define PARSE_H
 
-#include <sys/types.h>
+#include "command.h"
-
-struct Args {
-  unsigned int argc;
-  size_t argv_size;
-  char **argv;
-};
 
 void add_arg(struct Args *args, char *arg_ptr, unsigned int arg_length);
 void parse_worker(struct Args *args, char *arg_position, unsigned int arg_length, char *line);