add performance analysis tool to view import trees

lib/develop/performance/cmd/imports.vsh

@@ -0,0 +1,105 @@
+#!/usr/bin/env -S v -n -w -gc none -no-retry-compilation -cc tcc -d use_openssl -enable-globals run
+
+import os
+
+struct ImportNode {
+	name     string
+	children []ImportNode
+}
+
+// Function to recursively walk through a directory and gather all .v files
+fn walk_v_files(dir string) []string {
+	mut v_files := []string{}
+	if os.is_dir(dir) || os.is_link(dir) {
+		files := os.ls(dir) or { return [] }
+		for file in files {
+			full_path := os.join_path(dir, file)
+			if os.is_dir(full_path) || os.is_link(full_path) {
+				v_files << walk_v_files(full_path)
+			} else if full_path.ends_with('.v') {
+				v_files << full_path
+			}
+		}
+	}
+	return v_files
+}
+
+// Function to extract imports from a .v file
+fn extract_imports(file_path string) []string {
+	content := os.read_file(file_path) or {
+		println('Failed to read file: $file_path')
+		return []
+	}
+	mut imports := []string{}
+	for line in content.split_into_lines() {
+		if line.starts_with('import ') {
+			// Remove 'import ' and clean inline comments or braces
+			import_line := line[7..].all_before('//').all_before('{').trim_space()
+			if import_line.contains(' ') {
+				imports << import_line.split(',').map(it.trim_space())
+			} else {
+				imports << import_line
+			}
+		}
+	}
+	return imports
+}
+
+// Function to find the directory of a module in .vmodules
+fn find_module_dir(module_name string) string {
+	module_path := module_name.replace('.', os.path_separator)
+	vmodules_path := os.join_path(os.home_dir(), '.vmodules')
+	module_dir := os.join_path(vmodules_path, module_path)
+	if os.is_dir(module_dir) {
+		return module_dir
+	}
+	return ''
+}
+
+// Function to build a tree of imports, including .vmodules
+fn build_import_tree(file_path string, mut visited map[string]bool) ImportNode {
+	if file_path in visited {
+		return ImportNode{name: os.base(file_path), children: []}
+	}
+	visited[file_path] = true
+
+	imports := extract_imports(file_path)
+	mut children := []ImportNode{}
+
+	for import_path in imports {
+		// Check if the import is from the current project or .vmodules
+		module_dir := find_module_dir(import_path)
+		if module_dir != '' {
+			module_files := walk_v_files(module_dir)
+			mut module_children := []ImportNode{}
+			for module_file in module_files {
+				child_node := build_import_tree(module_file, mut visited)
+				module_children << child_node
+			}
+			children << ImportNode{name: import_path, children: module_children}
+		} else {
+			children << ImportNode{name: import_path, children: []}
+		}
+	}
+
+	return ImportNode{name: os.base(file_path), children: children}
+}
+
+// Function to print the tree of imports
+fn print_import_tree(node ImportNode, depth int) {
+	println('${'  '.repeat(depth)}- ${node.name}')
+	for child in node.children {
+		print_import_tree(child, depth + 1)
+	}
+}
+
+fn main() {
+	root_dir := '.' // Replace with your target directory
+	mut visited := map[string]bool{}
+	v_files := walk_v_files(root_dir)
+
+	for v_file in v_files {
+		root_node := build_import_tree(v_file, mut visited)
+		print_import_tree(root_node, 0)
+	}
+}