From e5aa953c043f0d0714a794453b7d485d60444382 Mon Sep 17 00:00:00 2001
From: Ahurac <ahurac@mailbox.org>
Date: Sat, 5 Oct 2024 20:22:53 +0200
Subject: [PATCH] feat(command): commands are executed

---
 src/command.c | 17 +++++++++++++++++
 src/command.h |  8 ++++++++
 src/main.c    | 15 +++------------
 src/parse.c   |  4 +++-
 4 files changed, 31 insertions(+), 13 deletions(-)
 create mode 100644 src/command.c
 create mode 100644 src/command.h

diff --git a/src/command.c b/src/command.c
new file mode 100644
index 0000000..c993e0d
--- /dev/null
+++ b/src/command.c
@@ -0,0 +1,17 @@
+#include "command.h"
+
+#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) {
+    execvp(args.argv[0], args.argv);
+    return 1;
+  }
+  waitpid(child, NULL, 0);
+
+  return 0;
+}
diff --git a/src/command.h b/src/command.h
new file mode 100644
index 0000000..b13a83c
--- /dev/null
+++ b/src/command.h
@@ -0,0 +1,8 @@
+#ifndef COMMAND_H
+#define COMMAND_H
+
+#include "parse.h"
+
+unsigned char invoke(struct Args args);
+
+#endif /* COMMAND_H */
diff --git a/src/main.c b/src/main.c
index 34a844e..9ace236 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "command.h"
 #include "parse.h"
 #include "reader.h"
 
@@ -14,19 +15,9 @@ int main() {
       return 0;
     }
 
-    printf("command: '%s'\n", input_line);
-
     struct Args args = parse(input_line);
-    unsigned int i = 0;
-    while (i < args.argc) {
-      if (i != 0) {
-        printf(" ");
-      }
-      printf("%s", args.argv[i]);
-      i++;
-    }
-    printf("\n");
-
     free(input_line);
+
+    invoke(args);
   }
 }
diff --git a/src/parse.c b/src/parse.c
index c17ac41..fc3bdc5 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -27,7 +27,9 @@ 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) {
   if (line[0] == '\n') {
-    add_arg(args, arg_position, arg_length);
+    if (arg_length != 0) {
+      add_arg(args, arg_position, arg_length);
+    }
     return;
   } else if (isspace(line[0])) {
     add_arg(args, arg_position, arg_length);