rhg: add rhg crate

The goal of rhg is to speedup some of hg's commands when possible by bypassing
python entirely for the time being.
It is by no means a replacement for hg as it will not support extentions or
configuration and implement only a subset of hg's commands and options.
Only use rhg if you understand what the tradeoffs are.

Differential Revision: https://phab.mercurial-scm.org/D8610

rust/rhg/Cargo.toml

@@ -0,0 +1,8 b''
+[package]
+name = "rhg"
+version = "0.1.0"
+authors = ["Antoine Cezar <[e-mail]>"]
+edition = "2018"
+
+[dependencies]
+

rust/rhg/README.md

@@ -0,0 +1,4 b''
+# rhg
+
+This project provides a fastpath Rust implementation of the Mercurial (`hg`)
+version control tool.

rust/rhg/rustfmt.toml

@@ -0,0 +1,3 b''
+max_width = 79
+wrap_comments = true
+error_on_line_overflow = true

rust/rhg/src/exitcode.rs

@@ -0,0 +1,4 b''
+pub type ExitCode = i32;
+
+/// Command not implemented by rhg
+pub const UNIMPLEMENTED_COMMAND: ExitCode = 252;

rust/rhg/src/main.rs

@@ -0,0 +1,5 b''
+mod exitcode;
+
+fn main() {
+    std::process::exit(exitcode::UNIMPLEMENTED_COMMAND)
+}

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rust/Cargo.toml

@@ -1,3 +1,3 b''
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+members = ["hg-core", "hg-cpython", "rhg"]
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