From 8f48240bf1e7d654e127ed1147df59be93c07db0 Mon Sep 17 00:00:00 2001
From: Max Brunsfeld <maxbrunsfeld@gmail.com>
Date: Mon, 14 Jan 2019 14:06:22 -0800
Subject: [PATCH] Allow building the C code with static analysis

---
 lib/build.rs | 41 +++++++++++++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/lib/build.rs b/lib/build.rs
index 7e8714ef..e4d1f91a 100644
--- a/lib/build.rs
+++ b/lib/build.rs
@@ -5,16 +5,7 @@ use std::path::{Path, PathBuf};
 use std::fs;
 
 fn main() {
-    let mut config = cc::Build::new();
-    config
-        .define("UTF8PROC_STATIC", "")
-        .flag_if_supported("-std=c99")
-        .flag_if_supported("-Wno-unused-parameter")
-        .include("include")
-        .include("utf8proc")
-        .file(Path::new("src").join("lib.c"))
-        .compile("tree-sitter");
-
+    println!("cargo:rerun-if-env-changed=TREE_SITTER_TEST");
     if env::var("TREE_SITTER_TEST").is_ok() {
         let mut parser_config = cc::Build::new();
         parser_config
@@ -65,4 +56,34 @@ fn main() {
         scanner_c_config.compile("fixture-scanners-c");
         scanner_cxx_config.compile("fixture-scanners-cxx");
     }
+
+    println!("cargo:rerun-if-env-changed=TREE_SITTER_STATIC_ANALYSIS");
+    if env::var("TREE_SITTER_STATIC_ANALYSIS").is_ok() {
+        let clang_path = which("clang").unwrap();
+        let clang_path = clang_path.to_str().unwrap();
+        env::set_var("CC", &format!("scan-build -analyze-headers --use-analyzer={} cc", clang_path));
+    }
+
+    let mut config = cc::Build::new();
+    config
+        .define("UTF8PROC_STATIC", "")
+        .flag_if_supported("-std=c99")
+        .flag_if_supported("-Wno-unused-parameter")
+        .include("include")
+        .include("utf8proc")
+        .file(Path::new("src").join("lib.c"))
+        .compile("tree-sitter");
+}
+
+fn which(exe_name: impl AsRef<Path>) -> Option<PathBuf> {
+    env::var_os("PATH").and_then(|paths| {
+        env::split_paths(&paths).find_map(|dir| {
+            let full_path = dir.join(&exe_name);
+            if full_path.is_file() {
+                Some(full_path)
+            } else {
+                None
+            }
+        })
+    })
 }