rustc/rusti/rustpkg: Infer packages from extern mod directives

This commit won't be quite as useful until I implement RUST_PATH and
until we change `extern mod` to take a general string instead of
an identifier (rust-lang#5682 and rust-lang#6407).

With that said, now if you're using rustpkg and a program contains:

extern mod foo;

rustpkg will attempt to search for `foo`, so that you don't have to
provide a -L directory explicitly. In addition, rustpkg will
actually try to build and install `foo`, unless it's already
installed (specifically, I tested that `extern mod extra;` would
not cause it to try to find source for `extra` and compile it
again).

This is as per rust-lang#5681.

Incidentally, I changed some driver code to infer the link name
from the crate link_meta attributes. If that change isn't ok, say
something.

src/librustc/driver/driver.rs

@@ -239,10 +239,10 @@ pub fn compile_rest(sess: Session,
     let middle::resolve::CrateMap {
         def_map: def_map,
         exp_map2: exp_map2,
-        trait_map: trait_map
-    } =
-        time(time_passes, ~"resolution", ||
-             middle::resolve::resolve_crate(sess, lang_items, crate));
+            trait_map: trait_map
+        } =
+            time(time_passes, ~"resolution", ||
+                 middle::resolve::resolve_crate(sess, lang_items, crate));
 
     time(time_passes, ~"looking for entry point",
          || middle::entry::find_entry_point(sess, crate, ast_map));

src/librustpkg/package_id.rs

@@ -12,6 +12,9 @@ pub use package_path::{RemotePath, LocalPath, normalize, hash};
 use core::prelude::*;
 use version::{try_getting_version, Version, NoVersion, split_version};
 
+/// Placeholder
+pub fn default_version() -> Version { ExactRevision(0.1) }
+
 /// Path-fragment identifier of a package such as
 /// 'github.com/graydon/test'; path must be a relative
 /// path with >=1 component.
@@ -77,7 +80,7 @@ impl PkgId {
         }
     }
 
-    pub fn hash(&self) -> ~str {
+    fn hash(&self) -> ~str {
         fmt!("%s-%s-%s", self.remote_path.to_str(),
              hash(self.remote_path.to_str() + self.version.to_str()),
              self.version.to_str())

src/librustpkg/package_path.rs

@@ -49,7 +49,8 @@ pub fn write<W: Writer>(writer: &mut W, string: &str) {
 }
 
 pub fn hash(data: ~str) -> ~str {
-    let hasher = &mut hash::default_state();
-    write(hasher, data);
+    let mut hasher = hash::default_state();
+    let buffer = str::as_bytes_slice(data);
+    hasher.write(buffer);
     hasher.result_str()
 }

src/librustpkg/path_util.rs

@@ -12,7 +12,7 @@
 
 use core::prelude::*;
 pub use package_path::{RemotePath, LocalPath};
-pub use package_id::PkgId;
+pub use package_id::{PkgId, Version{;
 pub use target::{OutputType, Main, Lib, Test, Bench, Target, Build, Install};
 use core::libc::consts::os::posix88::{S_IRUSR, S_IWUSR, S_IXUSR};
 use core::os::mkdir_recursive;
@@ -116,20 +116,20 @@ fn output_in_workspace(pkgid: &PkgId, workspace: &Path, what: OutputType) -> Opt
 pub fn built_library_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<Path> {
                         // passing in local_path here sounds fishy
     library_in_workspace(pkgid.local_path.to_str(), pkgid.short_name, Build,
-                         workspace, "build")
+                         Some(@copy pkgid.version), workspace, "build")
 }
 
 /// Does the actual searching stuff
 pub fn installed_library_in_workspace(short_name: &str, workspace: &Path) -> Option<Path> {
-    library_in_workspace(short_name, short_name, Install, workspace, "lib")
+    library_in_workspace(short_name, short_name, Install, None, workspace, "lib")
 }
 
 
 /// This doesn't take a PkgId, so we can use it for `extern mod` inference, where we
 /// don't know the entire package ID.
 /// `full_name` is used to figure out the directory to search.
 /// `short_name` is taken as the link name of the library.
-fn library_in_workspace(full_name: &str, short_name: &str, where: Target,
+fn library_in_workspace(full_name: &str, short_name: &str, where: Target, version: Option<@Version>,
                         workspace: &Path, prefix: &str) -> Option<Path> {
     debug!("library_in_workspace: checking whether a library named %s exists",
            short_name);
@@ -210,17 +210,11 @@ pub fn target_executable_in_workspace(pkgid: &PkgId, workspace: &Path) -> Path {
 }
 
 
-/// Returns the installed path for <built_library> in <workspace>
+/// Returns the executable that would be installed for <pkgid>
+/// in <workspace>
 /// As a side effect, creates the lib-dir if it doesn't exist
-pub fn target_library_in_workspace(workspace: &Path,
-                                   built_library: &Path) -> Path {
-    use conditions::bad_path::cond;
-    let result = workspace.push("lib");
-    if !os::path_exists(&result) && !mkdir_recursive(&result, u_rwx) {
-        cond.raise((copy result, ~"I couldn't create the library directory"));
-    }
-    result.push(built_library.filename().expect(fmt!("I don't know how to treat %s as a library",
-                                                   built_library.to_str())))
+pub fn target_library_in_workspace(pkgid: &PkgId, workspace: &Path) -> Path {
+    target_file_in_workspace(pkgid, workspace, Lib, Install)
 }
 
 /// Returns the test executable that would be installed for <pkgid>

src/librustpkg/rustpkg.rc

@@ -149,6 +149,7 @@ impl<'self> PkgScript<'self> {
                                                &self.build_dir,
                                                sess,
                                                crate,
+                                               util::Main,
                                                driver::build_configuration(sess,
                                                                            binary, &self.input));
                 debug!("Running program: %s %s %s", exe.to_str(), root.to_str(), what);

src/librustpkg/tests.rs

@@ -18,7 +18,7 @@ use core::prelude::*;
 use core::result;
 use extra::tempfile::mkdtemp;
 use package_path::*;
-use package_id::PkgId;
+use package_id::{PkgId, default_version};
 use package_source::*;
 use version::{ExactRevision, NoVersion, Version};
 use path_util::{target_executable_in_workspace, target_library_in_workspace,
@@ -82,6 +82,12 @@ fn mk_temp_workspace(short_name: &LocalPath, version: &Version) -> Path {
     debug!("Created %s and does it exist? %?", package_dir.to_str(),
           os::path_is_dir(&package_dir));
     // Create main, lib, test, and bench files
+    let package_dir = workspace.push("src").push(fmt!("%s-0.1", short_name.to_str()));
+    assert!(os::mkdir_recursive(&package_dir, u_rwx));
+    debug!("Created %s and does it exist? %?", package_dir.to_str(),
+          os::path_is_dir(&package_dir));
+    // Create main, lib, test, and bench files
+
     writeFile(&package_dir.push("main.rs"),
               "fn main() { let _x = (); }");
     writeFile(&package_dir.push("lib.rs"),
@@ -90,7 +96,7 @@ fn mk_temp_workspace(short_name: &LocalPath, version: &Version) -> Path {
               "#[test] pub fn f() { (); }");
     writeFile(&package_dir.push("bench.rs"),
               "#[bench] pub fn f() { (); }");
-    package_dir.pop().pop()
+    package_dir
 }
 
 fn is_rwx(p: &Path) -> bool {

src/librustpkg/util.rs

@@ -186,7 +186,6 @@ pub fn warn(msg: &str) {
 pub fn error(msg: &str) {
     pretty_message(msg, "error: ", term::color_red, io::stdout())
 }
-
 // FIXME (#4432): Use workcache to only compile when needed
 pub fn compile_input(ctxt: &Ctx,
                      pkg_id: &PkgId,
@@ -318,7 +317,7 @@ pub fn compile_crate_from_input(input: &driver::input,
 }
 
 #[cfg(windows)]
-pub fn exe_suffix() -> ~str { ~".exe" }
+pub fn exe_suffix() -> ~str { ".exe" }
 
 #[cfg(target_os = "linux")]
 #[cfg(target_os = "android")]