Add shards info command

Makefile

@@ -34,7 +34,7 @@ uninstall: phony
 test: test_unit test_integration
 
 test_unit: phony
-	$(CRYSTAL) run test/*_test.cr
+	$(CRYSTAL) run test/*_test.cr test/commands/*_test.cr
 
 test_integration: bin/shards phony
 	$(CRYSTAL) run test/integration/*_test.cr

man/shards.1

@@ -39,6 +39,28 @@ dependencies are satisfied,
 dependencies aren't satisfied.
 .RE
 .PP
+\fBinfo [<command>]\fR
+.RS 4
+Displays information about a shard.
+.SS
+.RS 4
+Commands:
+.PP
+.TP 3
+\fB--name\fR
+Print the name of the shard.
+.TP 3
+\fB--version\fR
+Print the version in `spec.yml`.
+.TP 3
+\fB-h, --help\fR
+Print usage synopsis.
+.RE
+.PP
+.RS 4
+If no command is given, a summary including name and version is printed.
+.RE
+.PP
 \fBinit\fR
 .RS 4
 Initializes a default \fIshard.yml\fR in the current folder.

src/cli.cr

@@ -9,6 +9,7 @@ module Shards
       Commands:
           build [<targets>] [<options>]  - Build the specified <targets> in `bin` path.
           check                          - Verify all dependencies are installed.
+          info [<options>...]            - Show information about a shard. Pass `--help` for details.
           init                           - Initialize a `shard.yml` file.
           install                        - Install dependencies, creating or using the `shard.lock` file.
           list [--tree]                  - List installed dependencies.
@@ -41,6 +42,8 @@ module Shards
           build(path, args)
         when "check"
           Commands::Check.run(path)
+        when "info"
+          Commands::Info.run(path, args)
         when "init"
           Commands::Init.run(path)
         when "install"
@@ -64,7 +67,7 @@ module Shards
             args.reject(&.starts_with?("--"))
           )
         when "version"
-          Commands::Version.run(args[1]? || path)
+          Commands::Info.run(args.shift? || path, ["--version"])
         when "--version"
           puts self.version_string
         when "-h", "--help"

src/commands/info.cr

@@ -0,0 +1,56 @@
+require "./command"
+
+module Shards
+  module Commands
+    class Info < Command
+      def initialize(path)
+        super lookup_path(path)
+      end
+
+      def display_help
+        puts <<-HELP
+          shards info [<command>]
+
+          Displays information about a shard.
+
+          Commands:
+              --name          - Print the name of the shard.
+              --version       - Print the version in `spec.yml`.
+              -h, --help      - Print usage synopsis.
+
+          If no command is given, a summary including name and version is printed.
+          HELP
+      end
+
+      def run(args, *, stdout = STDOUT)
+        case args.shift?
+        when "--name"
+          stdout.puts spec.name
+        when "--version"
+          stdout.puts spec.version
+        when "--help", "-h"
+          display_help
+        else
+          stdout.puts "   name: #{spec.name}"
+          stdout.puts "version: #{spec.version}"
+        end
+      end
+
+      # look up for `SPEC_FILENAME` in *path* or up
+      private def lookup_path(path)
+        previous = nil
+        current = File.expand_path(path)
+
+        until !File.directory?(current) || current == previous
+          shard_file = File.join(current, SPEC_FILENAME)
+          break if File.exists?(shard_file)
+
+          previous = current
+          current = File.dirname(current)
+        end
+
+        current
+      end
+    end
+  end
+end

test/commands/info_test.cr

@@ -0,0 +1,24 @@
+require "../../src/commands/info"
+require "../test_helper"
+require "../support/cli"
+
+private def capture(command, *args)
+  String.build do |io|
+    command.run(args.to_a, stdout: io)
+  end.chomp
+end
+
+class Shards::Commands::InfoTest < Minitest::Test
+  def test_reports_name
+    with_shard({name: "foo", version: "1.2.3"}) do
+      info = Shards::Commands::Info.new(application_path)
+
+      assert_equal "foo", capture(info, "--name")
+      assert_equal "1.2.3", capture(info, "--version")
+      assert_equal <<-OUT, capture(info, "")
+           name: foo
+        version: 1.2.3
+        OUT
+    end
+  end
+end

test/integration/info_test.cr

@@ -0,0 +1,34 @@
+require "../integration_helper"
+
+class InfoCommandTest < Minitest::Test
+  def test_reports_name
+    Dir.cd(application_path) do
+      with_shard({name: "foo"}) do
+        output = run "shards info --name", capture: true
+        assert_match "foo", output
+      end
+    end
+  end
+
+  def test_reports_version
+    Dir.cd(application_path) do
+      with_shard({version: "1.2.3"}) do
+        output = run "shards info --version", capture: true
+        assert_match "1.2.3", output
+      end
+    end
+  end
+
+  def test_reports_info
+    Dir.cd(application_path) do
+      with_shard({name: "foo", version: "1.2.3"}) do
+        output = run "shards info", capture: true
+        assert_match <<-OUT, output
+             name: foo
+          version: 1.2.3
+
+          OUT
+      end
+    end
+  end
+end

test/support/cli.cr

@@ -1,3 +1,5 @@
+require "./factories"
+
 module Shards
   module CliHelper
     def before_setup

test/support/factories.cr

@@ -3,7 +3,7 @@ class FailedCommand < Exception
   getter stderr : String
 
   def initialize(message, @stdout, @stderr)
-    super message
+    super "#{message}: #{stderr}"
   end
 end