Extract build.rs

Cargo.lock

@@ -1922,6 +1922,7 @@ dependencies = [
  "nom 5.0.1",
  "nom-tracable",
  "nom_locate",
+ "nu-build",
  "nu-errors",
  "nu-parser",
  "nu-protocol",
@@ -1970,6 +1971,16 @@ dependencies = [
  "which",
 ]
 
+[[package]]
+name = "nu-build"
+version = "0.1.0"
+dependencies = [
+ "lazy_static 1.4.0",
+ "serde 1.0.103",
+ "serde_json",
+ "toml 0.5.5",
+]
+
 [[package]]
 name = "nu-errors"
 version = "0.1.0"
@@ -1980,6 +1991,7 @@ dependencies = [
  "language-reporting",
  "nom 5.0.1",
  "nom_locate",
+ "nu-build",
  "nu-source",
  "num-bigint",
  "num-traits 0.2.10",
@@ -2006,6 +2018,7 @@ dependencies = [
  "nom 5.0.1",
  "nom-tracable",
  "nom_locate",
+ "nu-build",
  "nu-errors",
  "nu-protocol",
  "nu-source",
@@ -2035,6 +2048,7 @@ dependencies = [
  "nom 5.0.1",
  "nom-tracable",
  "nom_locate",
+ "nu-build",
  "nu-errors",
  "nu-source",
  "num-bigint",
@@ -2058,6 +2072,7 @@ dependencies = [
  "language-reporting",
  "nom-tracable",
  "nom_locate",
+ "nu-build",
  "pretty",
  "serde 1.0.103",
  "termcolor",
@@ -2070,6 +2085,7 @@ dependencies = [
  "ansi_term 0.12.1",
  "crossterm",
  "nu",
+ "nu-build",
  "nu-protocol",
  "nu-source",
  "syntect",

Cargo.toml

@@ -13,7 +13,7 @@ documentation = "https://book.nushell.sh"
 
 [workspace]
 
-members = ["crates/nu-errors", "crates/nu-source", "crates/nu-textview", "crates/nu-protocol", "crates/nu-parser"]
+members = ["crates/nu-errors", "crates/nu-source", "crates/nu-textview", "crates/nu-protocol", "crates/nu-parser", "crates/nu-build"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -126,6 +126,7 @@ pretty_assertions = "0.6.1"
 [build-dependencies]
 toml = "0.5.5"
 serde = { version = "1.0.102", features = ["derive"] }
+nu-build = { version = "0.1.0", path = "./crates/nu-build" }
 
 [lib]
 name = "nu"

build.rs

@@ -1,39 +1,3 @@
-use serde::Deserialize;
-use std::collections::HashMap;
-use std::collections::HashSet;
-use std::env;
-use std::path::Path;
-
-#[derive(Deserialize)]
-struct Feature {
-    #[allow(unused)]
-    description: String,
-    enabled: bool,
-}
-
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let input = env::var("CARGO_MANIFEST_DIR").unwrap();
+    nu_build::build()
-    let all_on = env::var("NUSHELL_ENABLE_ALL_FLAGS").is_ok();
-    let flags: HashSet<String> = env::var("NUSHELL_ENABLE_FLAGS")
-        .map(|s| s.split(",").map(|s| s.to_string()).collect())
-        .unwrap_or_else(|_| HashSet::new());
-
-    if all_on && !flags.is_empty() {
-        println!(
-            "cargo:warning={}",
-            "Both NUSHELL_ENABLE_ALL_FLAGS and NUSHELL_ENABLE_FLAGS were set. You don't need both."
-        );
-    }
-
-    let path = Path::new(&input).join("features.toml");
-
-    let toml: HashMap<String, Feature> = toml::from_str(&std::fs::read_to_string(path)?)?;
-
-    for (key, value) in toml.iter() {
-        if value.enabled == true || all_on || flags.contains(key) {
-            println!("cargo:rustc-cfg={}", key);
-        }
-    }
-
-    Ok(())
 }

crates/nu-build/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "nu-build"
+version = "0.1.0"
+authors = ["Yehuda Katz <wycats@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0.102", features = ["derive"] }
+lazy_static = "1.2.0"
+serde_json = "1.0.35"
+toml = "0.5.5"

crates/nu-build/src/lib.rs

@@ -0,0 +1,82 @@
+use lazy_static::lazy_static;
+use serde::Deserialize;
+use std::collections::BTreeMap;
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::env;
+use std::path::{Path, PathBuf};
+use std::sync::Mutex;
+
+lazy_static! {
+    static ref WORKSPACES: Mutex<BTreeMap<String, &'static Path>> = Mutex::new(BTreeMap::new());
+}
+
+// got from https://github.com/mitsuhiko/insta/blob/b113499249584cb650150d2d01ed96ee66db6b30/src/runtime.rs#L67-L88
+
+fn get_cargo_workspace(manifest_dir: &str) -> Option<&Path> {
+    let mut workspaces = WORKSPACES.lock().unwrap();
+    if let Some(rv) = workspaces.get(manifest_dir) {
+        Some(rv)
+    } else {
+        #[derive(Deserialize)]
+        struct Manifest {
+            workspace_root: String,
+        }
+        let output = std::process::Command::new(env!("CARGO"))
+            .arg("metadata")
+            .arg("--format-version=1")
+            .current_dir(manifest_dir)
+            .output()
+            .unwrap();
+        let manifest: Manifest = serde_json::from_slice(&output.stdout).unwrap();
+        let path = Box::leak(Box::new(PathBuf::from(manifest.workspace_root)));
+        workspaces.insert(manifest_dir.to_string(), path.as_path());
+        workspaces.get(manifest_dir).map(|w| *w)
+    }
+}
+
+#[derive(Deserialize)]
+struct Feature {
+    #[allow(unused)]
+    description: String,
+    enabled: bool,
+}
+
+pub fn build() -> Result<(), Box<dyn std::error::Error>> {
+    let input = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let all_on = env::var("NUSHELL_ENABLE_ALL_FLAGS").is_ok();
+    let flags: HashSet<String> = env::var("NUSHELL_ENABLE_FLAGS")
+        .map(|s| s.split(",").map(|s| s.to_string()).collect())
+        .unwrap_or_else(|_| HashSet::new());
+
+    if all_on && !flags.is_empty() {
+        println!(
+            "cargo:warning={}",
+            "Both NUSHELL_ENABLE_ALL_FLAGS and NUSHELL_ENABLE_FLAGS were set. You don't need both."
+        );
+    }
+
+    let workspace = match get_cargo_workspace(&input) {
+        // If the crate is being downloaded from crates.io, it won't have a workspace root, and that's ok
+        None => return Ok(()),
+        Some(workspace) => workspace,
+    };
+
+    let path = Path::new(&workspace).join("features.toml");
+
+    // If the crate is being downloaded from crates.io, it won't have a features.toml, and that's ok
+    if !path.exists() {
+        return Ok(());
+    }
+
+    let toml: HashMap<String, Feature> = toml::from_str(&std::fs::read_to_string(path)?)?;
+
+    for (key, value) in toml.iter() {
+        if value.enabled == true || all_on || flags.contains(key) {
+            println!("cargo:rustc-cfg={}", key);
+        }
+    }
+
+    Ok(())
+}

crates/nu-errors/Cargo.toml

@@ -24,3 +24,6 @@ subprocess = "0.1.18"
 serde_yaml = "0.8"
 toml = "0.5.5"
 serde_json = "1.0.41"
+
+[build-dependencies]
+nu-build = { version = "0.1.0", path = "../nu-build" }

crates/nu-errors/build.rs

@@ -0,0 +1,3 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    nu_build::build()
+}

crates/nu-parser/Cargo.toml

@@ -35,3 +35,6 @@ unicode-xid = "0.2.0"
 
 [dev-dependencies]
 pretty_assertions = "0.6.1"
+
+[build-dependencies]
+nu-build = { version = "0.1.0", path = "../nu-build" }

crates/nu-parser/build.rs

@@ -0,0 +1,3 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    nu_build::build()
+}

crates/nu-protocol/Cargo.toml

@@ -33,3 +33,5 @@ serde_yaml = "0.8"
 toml = "0.5.5"
 serde_json = "1.0.41"
 
+[build-dependencies]
+nu-build = { version = "0.1.0", path = "../nu-build" }

crates/nu-protocol/build.rs

@@ -0,0 +1,3 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    nu_build::build()
+}

crates/nu-source/Cargo.toml

@@ -18,3 +18,6 @@ nom-tracable = "0.4.1"
 language-reporting = "0.4.0"
 termcolor = "1.0.5"
 pretty = "0.5.2"
+
+[build-dependencies]
+nu-build = { version = "0.1.0", path = "../nu-build" }

crates/nu-source/build.rs

@@ -0,0 +1,3 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    nu_build::build()
+}

crates/nu-textview/Cargo.toml

@@ -20,3 +20,6 @@ nu = { path = "../.." }
 nu-protocol = { path = "../nu-protocol" }
 nu-source = { path = "../nu-source" }
 url = "2.1.0"
+
+[build-dependencies]
+nu-build = { version = "0.1.0", path = "../nu-build" }

crates/nu-textview/build.rs

@@ -0,0 +1,3 @@
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    nu_build::build()
+}