From 40d6daf8240f9dc090c23f975488c424b88f120f Mon Sep 17 00:00:00 2001
From: Goffert van Gool <ruphin@ruphin.net>
Date: Thu, 13 Dec 2018 22:16:58 +0100
Subject: [PATCH] Read version from Cargo.toml (#1267)

---
 BUILD.gn                            | 19 +++++++++++++++++++
 build_extra/rust/get_cargo_info.cmd |  1 +
 build_extra/rust/get_cargo_info.py  | 14 ++++++++++++++
 build_extra/rust/run.py             | 17 ++++++++++++++---
 build_extra/rust/rust.gni           |  8 ++++++++
 src/version.rs                      |  3 +--
 6 files changed, 57 insertions(+), 5 deletions(-)
 create mode 100644 build_extra/rust/get_cargo_info.cmd
 create mode 100755 build_extra/rust/get_cargo_info.py

diff --git a/BUILD.gn b/BUILD.gn
index f9b3afc081..921754ef18 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -119,12 +119,25 @@ group("deno_deps") {
   ]
 }
 
+# Reads the cargo info from Cargo.toml
+deno_cargo_info = exec_script("build_extra/rust/get_cargo_info.py",
+                              [ rebase_path("Cargo.toml", root_build_dir) ],
+                              "json")
+
 rust_executable("deno") {
   source_root = "src/main.rs"
   extern = main_extern
   deps = [
     ":deno_deps",
   ]
+
+  # Extract version from Cargo.toml
+  # TODO integrate this into rust.gni by allowing the rust_executable template
+  # to specify a cargo.toml from which it will extract a version.
+  crate_version = deno_cargo_info.version
+  inputs = [
+    "Cargo.toml",
+  ]
 }
 
 rust_test("test_rs") {
@@ -133,6 +146,12 @@ rust_test("test_rs") {
   deps = [
     ":deno_deps",
   ]
+
+  # Extract version from Cargo.toml
+  crate_version = deno_cargo_info.version
+  inputs = [
+    "Cargo.toml",
+  ]
 }
 
 rust_executable("hyper_hello") {
diff --git a/build_extra/rust/get_cargo_info.cmd b/build_extra/rust/get_cargo_info.cmd
new file mode 100644
index 0000000000..9d5ce12a16
--- /dev/null
+++ b/build_extra/rust/get_cargo_info.cmd
@@ -0,0 +1 @@
+@"%PYTHON_EXE%" "%~dpn0.py" %*
diff --git a/build_extra/rust/get_cargo_info.py b/build_extra/rust/get_cargo_info.py
new file mode 100755
index 0000000000..43c964ab76
--- /dev/null
+++ b/build_extra/rust/get_cargo_info.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+# Copyright 2018 the Deno authors. All rights reserved. MIT license.
+
+import sys
+import re
+
+# Read the package version from Cargo.toml and output as json
+cargo_toml_path = sys.argv[1]
+
+for line in open(cargo_toml_path):
+    match = re.search('version = "(.*)"', line)
+    if match:
+        print('{"version": "' + match.group(1) + '"}')
+        break
diff --git a/build_extra/rust/run.py b/build_extra/rust/run.py
index 3a86c423c0..dc89c09a1f 100644
--- a/build_extra/rust/run.py
+++ b/build_extra/rust/run.py
@@ -1,13 +1,24 @@
 #!/usr/bin/env python
-# This file just executes its arguments, except that also adds GN_OUT_DIR to the
-# environ. This is for compatibility with cargo.
+# This file just executes its arguments, except that also adds GN_OUT_DIR and
+# CARGO_PKG_VERSION to the environ. This is for compatibility with cargo.
 import subprocess
 import sys
 import os
+import re
 
 # This is for src/msg.rs to know where to find msg_generated.rs.
 # When building with Cargo this variable is set by build.rs.
 os.environ["GN_OUT_DIR"] = os.path.abspath(".")
 assert os.path.isdir(os.environ["GN_OUT_DIR"])
 
-sys.exit(subprocess.call(sys.argv[1:]))
+# Set the CARGO_PKG_VERSION env variable if provided as an argument
+# When building with Cargo this variable is set automatically
+args = sys.argv[1:]
+for i, arg in enumerate(args):
+    match = re.search('--cargo-pkg-version="?([^"]*)"?', arg)
+    if match:
+        os.environ["CARGO_PKG_VERSION"] = match.group(1)
+        del args[i]
+        break
+
+sys.exit(subprocess.call(args))
diff --git a/build_extra/rust/rust.gni b/build_extra/rust/rust.gni
index 3263f0018f..61731d21c7 100644
--- a/build_extra/rust/rust.gni
+++ b/build_extra/rust/rust.gni
@@ -49,6 +49,7 @@ template("rust_crate") {
                            "crate_type",
                            "crate_version",
                            "deps",
+                           "inputs",
                            "features",
                            "is_test",
                            "libs",
@@ -190,6 +191,13 @@ template("rust_crate") {
       "--color=always",
     ]
 
+    if (defined(crate_version)) {
+      args += [
+        # This is used to set env variables for Cargo build compatibility
+        "--cargo-pkg-version=$crate_version",
+      ]
+    }
+
     if (is_debug) {
       args += [ "-g" ]
     }
diff --git a/src/version.rs b/src/version.rs
index 85238749e1..0d4c7b9535 100644
--- a/src/version.rs
+++ b/src/version.rs
@@ -2,8 +2,7 @@
 use libdeno;
 use std::ffi::CStr;
 
-// TODO Extract this version string from Cargo.toml.
-pub const DENO: &str = "0.2.2";
+pub const DENO: &str = env!("CARGO_PKG_VERSION");
 
 pub fn v8() -> &'static str {
   let version = unsafe { libdeno::deno_v8_version() };