Prepare for 0.2.0 release

Cargo.lock

@@ -120,13 +120,14 @@ dependencies = [
 
 [[package]]
 name = "colmena"
-version = "0.1.0"
+version = "0.2.0-pre"
 dependencies = [
  "ansi-to-html",
  "async-trait",
  "atty",
  "clap",
  "console 0.13.0",
+ "const_format",
  "env_logger",
  "futures",
  "glob",
@@ -179,6 +180,26 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "const_format"
+version = "0.2.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22bc6cd49b0ec407b680c3e380182b6ac63b73991cb7602de350352fc309b614"
+dependencies = [
+ "const_format_proc_macros",
+]
+
+[[package]]
+name = "const_format_proc_macros"
+version = "0.2.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef196d5d972878a48da7decb7686eded338b4858fbabeed513d63a7c98b2b82d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
 [[package]]
 name = "doc-comment"
 version = "0.3.3"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "colmena"
-version = "0.1.0"
+version = "0.2.0-pre"
 authors = ["Zhaofeng Li <hello@zhaofeng.li>"]
 edition = "2018"
 
@@ -12,6 +12,7 @@ async-trait = "0.1.42"
 atty = "0.2"
 clap = "2.33.3"
 console = "0.13.0"
+const_format = "0.2.22"
 env_logger = "0.8.2"
 futures = "0.3.8"
 glob = "0.3.0"

default.nix

@@ -11,15 +11,15 @@ in {
   stdenv = pkgs.stdenv;
   rustPlatform = pkgs.rustPlatform;
 in rustPlatform.buildRustPackage {
-  name = "colmena-dev";
-  version = "0.1.0";
+  name = "colmena";
+  version = "0.2.0-pre";
 
   src = lib.cleanSourceWith {
     filter = name: type: !(type == "directory" && builtins.elem (baseNameOf name) [ "target" "manual" ]);
     src = lib.cleanSource ./.;
   };
 
-  cargoSha256 = "sha256-JDJQnKO0j1DegOyuZi3WU4wVnotucSVPbwbn25R8Jb8=";
+  cargoSha256 = "sha256-cpxvhP9TVEaIaiIZ+X22bDREqALpgWtW6koucVfMLwY=";
 
   postInstall = lib.optionalString (stdenv.hostPlatform == stdenv.buildPlatform) ''
     mkdir completions

src/cli.rs

@@ -1,16 +1,49 @@
 //! Global CLI Setup.
 
 use clap::{App, AppSettings, Arg, ArgMatches, SubCommand};
+use const_format::concatcp;
 use lazy_static::lazy_static;
 
 use crate::command;
 
+/// Base URL of the manual, without the trailing slash.
+const MANUAL_URL_BASE: &'static str = "https://zhaofengli.github.io/colmena";
+
+/// URL to the manual.
+///
+/// We maintain CLI and Nix API stability for each minor version.
+/// This ensures that the user always sees accurate documentations, and we can
+/// easily perform updates to the manual after a release.
+const MANUAL_URL: &'static str = concatcp!(MANUAL_URL_BASE, "/", env!("CARGO_PKG_VERSION_MAJOR"), ".", env!("CARGO_PKG_VERSION_MINOR"));
+
+/// The note shown when the user is using a pre-release version.
+///
+/// API stability cannot be guaranteed for pre-release versions.
+/// Links to the version currently in development automatically
+/// leads the user to the unstable manual.
+const MANUAL_DISCREPANCY_NOTE: &'static str = "Note: You are using a pre-release version of Colmena, so the supported options may be different from what's in the manual.";
+
 lazy_static! {
+    static ref LONG_ABOUT: String = {
+        let mut message = format!(r#"NixOS deployment tool
+
+Colmena helps you deploy to multiple hosts running NixOS.
+For more details, read the manual at <{}>.
+
+"#, MANUAL_URL);
+
+        if env!("CARGO_PKG_VERSION_PRE").len() != 0 {
+            message += &MANUAL_DISCREPANCY_NOTE;
+        }
+
+        message
+    };
+
     static ref CONFIG_HELP: String = {
         format!(r#"If this argument is not specified, Colmena will search upwards from the current working directory for a file named "flake.nix" or "hive.nix". This behavior is disabled if --config/-f is given explicitly.
 
-For a sample configuration, see <https://zhaofengli.github.io/colmena/{}>.
-"#, env!("CARGO_PKG_VERSION"))
+For a sample configuration, check the manual at <{}>.
+"#, MANUAL_URL)
     };
 }
 
@@ -42,6 +75,7 @@ pub fn build_cli(include_internal: bool) -> App<'static, 'static> {
         .version(version)
         .author("Zhaofeng Li <hello@zhaofeng.li>")
         .about("NixOS deployment tool")
+        .long_about(LONG_ABOUT.as_str())
         .global_setting(AppSettings::ColoredHelp)
         .setting(AppSettings::ArgRequiredElseHelp)
         .arg(Arg::with_name("config")