feat(pretty-print): Just casually implemented the graphviz representation of parsed AST

.gitignore

@@ -175,3 +175,4 @@ m4/ltversion.m4
 m4/lt~obsolete.m4
 
 Makefile
+*.svg

src/utils/ast/ast.c

@@ -1,9 +1,96 @@
-#include "ast.h"
-
 #include <assert.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 
+#include "ast.h"
+
+static void ast_print_dot_recursive(struct ast *node, FILE *out)
+{
+    if (!node)
+        return;
+
+    switch (node->type)
+    {
+    case AST_IF:
+    {
+        struct ast_if *if_data = ast_get_if(node);
+        fprintf(out, "  node%p [label=\"IF\"];\n", (void *)node);
+
+        if (if_data->condition)
+        {
+            fprintf(out, "  node%p -> node%p;\n", (void *)node,
+                    (void *)if_data->condition);
+            fprintf(out, "  node%p [fillcolor=\"lightyellow\", style=\"filled\"];\n",
+                    (void *)if_data->condition);
+            ast_print_dot_recursive(if_data->condition, out);
+
+            if (if_data->then_clause)
+            {
+                fprintf(out, "  node%p -> node%p [label=\"true\"];\n",
+                        (void *)if_data->condition, (void *)if_data->then_clause);
+                ast_print_dot_recursive(if_data->then_clause, out);
+            }
+
+            if (if_data->else_clause)
+            {
+                fprintf(out, "  node%p -> node%p [label=\"false\"];\n",
+                        (void *)if_data->condition, (void *)if_data->else_clause);
+                ast_print_dot_recursive(if_data->else_clause, out);
+            }
+        }
+        break;
+    }
+    case AST_CMD:
+    {
+        struct ast_cmd *cmd_data = ast_get_cmd(node);
+        fprintf(out, "  node%p [label=\"", (void *)node);
+        struct list *l = cmd_data->cmd;
+        while (l)
+        {
+            fprintf(out, "%s", (char *)l->data);
+            if (l->next)
+                fprintf(out, " ");
+            l = l->next;
+        }
+        fprintf(out, "\"];\n");
+        break;
+    }
+    case AST_END:
+        fprintf(out, "  node%p [label=\"END\"];\n", (void *)node);
+        break;
+    default:
+        break;
+    }
+}
+
+void ast_print_dot(struct ast *ast)
+{
+    // Always print to stdout so the user can see it in the terminal
+    printf("digraph AST {\n");
+    if (ast)
+    {
+        ast_print_dot_recursive(ast, stdout);
+    }
+    printf("}\n");
+
+    if (!ast)
+        return;
+
+    FILE *dot_pipe = popen("dot -Tsvg -o ast.svg", "w");
+    if (!dot_pipe)
+    {
+        return;
+    }
+
+    fprintf(dot_pipe, "digraph AST {\n");
+    ast_print_dot_recursive(ast, dot_pipe);
+    fprintf(dot_pipe, "}\n");
+    pclose(dot_pipe);
+
+    system("open ast.svg");
+}
+
 bool ast_is_if(struct ast *node)
 {
     assert(node != NULL);

src/utils/ast/ast.h

@@ -70,4 +70,9 @@ struct ast *ast_create_if(struct ast *condition, struct ast *then_clause,
  */
 struct ast *ast_create_cmd(struct list *cmd);
 
+/**
+ * Prints the Graphviz DOT representation of the given AST to stdout.
+ */
+void ast_print_dot(struct ast *ast);
+
 #endif /* ! AST_H */