From 03834f4cf2ec7d1b7ac02c76e551b281ba4a2116 Mon Sep 17 00:00:00 2001
From: Jeff Lindsay <progrium@gmail.com>
Date: Wed, 30 Aug 2023 10:44:49 -0500
Subject: [PATCH] generate: add findstruct tool (#209)

* generate: add findstruct tool

* docs: fix findstruct example

* generate: add build ignore to tools
---
 docs/generation.md           |  6 ++++
 generate/tools/findstruct.go | 60 ++++++++++++++++++++++++++++++++++++
 generate/tools/genmod.go     |  2 ++
 3 files changed, 68 insertions(+)
 create mode 100644 generate/tools/findstruct.go

diff --git a/docs/generation.md b/docs/generation.md
index 63ea80f8..21119a23 100644
--- a/docs/generation.md
+++ b/docs/generation.md
@@ -219,3 +219,9 @@ Finds type symbol(s) in symbolsdb with the given type name. Can be used with `jq
 Re-generates frameworks that have been generated (have .gen.go files).
 
 `./generate/tools/regen.sh macos`
+
+### findstruct [struct-name]
+
+Looks through XCode SDK headers for a struct definition. Helpful to fill in struct definitions.
+
+`go run ./generate/tools/findstruct.go CLLocationCoordinate2D`
diff --git a/generate/tools/findstruct.go b/generate/tools/findstruct.go
new file mode 100644
index 00000000..2a849a93
--- /dev/null
+++ b/generate/tools/findstruct.go
@@ -0,0 +1,60 @@
+//go:build ignore
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: findstruct <struct_name>")
+		return
+	}
+
+	cmd := exec.Command("xcrun", "--show-sdk-path")
+	b, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	dir := fmt.Sprintf("%s/System/Library/Frameworks", strings.TrimSpace(string(b)))
+	structName := os.Args[1]
+
+	// Naive regex to find C struct definitions
+	// It won't capture complex scenarios or structs split across lines.
+	re := regexp.MustCompile(`(?s)struct\s+` + structName + `\s+\{.*?\};`)
+
+	filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if !info.IsDir() && (filepath.Ext(path) == ".h" || filepath.Ext(path) == ".c") {
+			file, err := os.Open(path)
+			if err != nil {
+				return err
+			}
+			defer file.Close()
+
+			var content string
+			scanner := bufio.NewScanner(file)
+			for scanner.Scan() {
+				content += scanner.Text() + "\n"
+			}
+
+			matches := re.FindAllString(content, -1)
+			for _, match := range matches {
+				fmt.Println(match)
+			}
+		}
+		return nil
+	})
+}
diff --git a/generate/tools/genmod.go b/generate/tools/genmod.go
index 8707d7f8..e261fac3 100644
--- a/generate/tools/genmod.go
+++ b/generate/tools/genmod.go
@@ -1,3 +1,5 @@
+//go:build ignore
+
 package main
 
 import (