feat: single quotes expansion

src/expansion/expansion.c

@@ -0,0 +1,68 @@
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../ast/ast.h"
+
+struct ast_cmd *expand(struct ast_cmd *cmd)
+{
+    if (cmd == NULL)
+        return NULL;
+
+    bool in_quotes = false;
+    char *str;
+    size_t len;
+    struct list *l = cmd->cmd;
+
+    while (l != NULL)
+    {
+        in_quotes = false;
+        str = (char *)l->data;
+        len = strlen(str);
+
+        for (size_t i = 0; str[i] != '\0'; i++)
+        {
+            if (in_quotes)
+            {
+                // do nothing
+            }
+            else if (str[i] == '\'')
+            {
+                in_quotes = !in_quotes;
+                memmove(&str[i], &str[i + 1], strlen(&str[i + 1]) + 1);
+            }
+            // else if (str[i] == '$' && str[i + 1] != '\0' && str[i + 1] != '$'
+            //          && str[i + 1] != ' ')
+            else if (str[i] == '$' && isalnum(str[i + 1]))
+            {
+                // variable expansion
+            }
+        }
+
+        if (in_quotes)
+        {
+            // error: quote not closed
+        }
+
+        if (len != strlen(str))
+        {
+            char *new_str = realloc(str, strlen(str) + 1);
+            if (new_str == NULL)
+            {
+                // error: realloc fail
+            }
+            l->data = new_str;
+        }
+
+        l = l->next;
+    }
+    return cmd;
+}
+
+int main()
+{
+    printf("Expansion module test\n");
+    return 0;
+}