auto merge of #6015 : catamorphism/rust/rustpkg-doc-second-try, r=catamorphism

r? @graydon

Only change from the version that you read is that I addressed your comment about `RUST_PATH`.

Author: bors

doc/rustpkg.md

@@ -0,0 +1,108 @@
+% Rustpkg Reference Manual
+
+# Introduction
+
+This document is the reference manual for the Rustpkg packaging and build tool for the Rust programming language.
+
+## Disclaimer
+
+Rustpkg is a work in progress, as is this reference manual.
+If the actual behavior of rustpkg differs from the behavior described in this reference,
+that reflects either an incompleteness or a bug in rustpkg.
+
+# Package searching
+
+rustpkg searches for packages using the `RUST_PATH` environment variable,
+which is a colon-separated list (semicolon-separated on Windows) of directories.
+
+Each directory in this list is a *workspace* for rustpkg.
+
+`RUST_PATH` implicitly contains an entry for `./.rust` (as well as
+`../.rust`, `../../.rust`,
+and so on for every parent of `.` up to the filesystem root).
+That means that if `RUST_PATH` is not set,
+then rustpkg will still search for workspaces in `./.rust` and so on.
+`RUST_PATH` also implicitly contains an entry for the system path:
+`/usr/local` or the equivalent on Windows.
+This entry comes after the implicit entries for `./.rust` and so on.
+Finally, the last implicit entry in `RUST_PATH` is `~/.rust`
+or the equivalent on Windows.
+
+Each workspace may contain one or more packages.
+
+# Package structure
+
+A valid workspace must contain each of the following subdirectories:
+
+* 'src/': contains one subdirectory per package. Each subdirectory contains source files for a given package.
+
+     For example, if `foo` is a workspace containing the package `bar`,
+     then `foo/src/bar/main.rs` could be the `main` entry point for
+     building a `bar` executable.
+* 'lib/': `rustpkg install` installs libraries into a target-specific subdirectory of this directory.
+
+     For example, on a 64-bit machine running Mac OS X,
+     if `foo` is a workspace containing the package `bar`,
+     rustpkg will install libraries for bar to `foo/lib/x86_64-apple-darwin/`.
+     The libraries will have names of the form `foo/lib/x86_64-apple-darwin/libbar-[hash].dylib`,
+     where [hash] is a hash of the package ID.
+* 'bin/': `rustpkg install` installs executable binaries into a target-specific subdirectory of this directory.
+
+     For example, on a 64-bit machine running Mac OS X,
+     if `foo` is a workspace, containing the package `bar`,
+     rustpkg will install executables for `bar` to
+     `foo/bin/x86_64-apple-darwin/`.
+     The executables will have names of the form `foo/bin/x86_64-apple-darwin/bar`.
+* 'build/': `rustpkg build` stores temporary build artifacts in a target-specific subdirectory of this directory.
+
+     For example, on a 64-bit machine running Mac OS X,
+     if `foo` is a workspace containing the package `bar` and `foo/src/bar/main.rs` exists,
+     then `rustpkg build` will create `foo/build/x86_64-apple-darwin/bar/main.o`.
+
+# Package identifiers
+
+A package identifier identifies a package uniquely.
+A package can be stored in a workspace on the local file system,
+or on a remote Web server, in which case the package ID resembles a URL.
+For example, `github.com/mozilla/rust` is a package ID
+that would refer to the git repository browsable at `http://github.com/mozilla/rust`.
+
+## Source files
+
+rustpkg searches for four different fixed filenames in order to determine the crates to build:
+
+* `main.rs`: Assumed to be a main entry point for building an executable.
+* `lib.rs`: Assumed to be a library crate.
+* `test.rs`: Assumed to contain tests declared with the `#[test]` attribute.
+* `bench.rs`: Assumed to contain benchmarks declared with the `#[bench]` attribute.
+
+# Custom build scripts
+
+A file called `pkg.rs` at the root level in a workspace is called a *package script*.
+If a package script exists, rustpkg executes it to build the package
+rather than inferring crates as described previously.
+
+# Command reference
+
+## build
+
+`rustpkg build foo` searches for a package with ID `foo`
+and builds it in any workspace(s) where it finds one.
+Supposing such packages are found in workspaces X, Y, and Z,
+the command leaves behind files in `X`'s, `Y`'s, and `Z`'s `build` directories,
+but not in their `lib` or `bin` directories.
+
+## clean
+
+`rustpkg clean foo` deletes the contents of `foo`'s `build` directory.
+
+## install
+
+`rustpkg install foo` builds the libraries and/or executables that are targets for `foo`,
+and then installs them either into `foo`'s `lib` and `bin` directories,
+or into the `lib` and `bin` subdirectories of the first entry in `RUST_PATH`.
+
+## test
+
+`rustpkg test foo` builds `foo`'s `test.rs` file if necessary,
+then runs the resulting test executable.

mk/docs.mk

@@ -81,6 +81,20 @@ doc/rust.pdf: doc/rust.tex
     endif
   endif
 
+DOCS += doc/rustpkg.html
+doc/rustpkg.html: rustpkg.md doc/version_info.html doc/rust.css doc/manual.css
+	@$(call E, pandoc: $@)
+	$(Q)$(CFG_NODE) $(S)doc/prep.js --highlight $< | \
+	"$(CFG_PANDOC)" \
+         --standalone --toc \
+         --section-divs \
+         --number-sections \
+         --from=markdown --to=html \
+         --css=rust.css \
+         --css=manual.css \
+	     --include-before-body=doc/version_info.html \
+         --output=$@
+
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