Show an error message when git CLI is not available. Closes #1765

middleman-cli/lib/middleman-cli/init.rb

@@ -4,6 +4,8 @@ module Middleman::Cli
   class Init < Thor::Group
     include Thor::Actions
 
+    GIT_CMD = 'git'
+
     check_unknown_options!
 
     argument :target, type: :string, default: '.'
@@ -25,6 +27,13 @@ module Middleman::Cli
       require 'fileutils'
       require 'tmpdir'
 
+      if !git_present?
+        msg =  "You need to install the git command line tool to initialize a new project. "
+        msg << "For help installing git, please refer to GitHub's tutorial at https://help.github.com/articles/set-up-git"
+        say msg, :red
+        exit 1
+      end
+
       repo_path, repo_branch = if shortname?(options[:template])
         require 'open-uri'
         require 'json'
@@ -51,10 +60,11 @@ module Middleman::Cli
       begin
         branch_cmd = repo_branch ? "-b #{repo_branch} " : ''
 
-        run("git clone --depth 1 #{branch_cmd}#{repo_path} #{dir}")
+        git_path = "#{branch_cmd}#{repo_path}"
+        run("#{GIT_CMD} clone --depth 1 #{branch_cmd}#{repo_path} #{dir}")
 
-        unless File.directory?(dir)
-          say 'Git clone failed, maybe the url is invalid or you don\'t have the permissions?', :red
+        if !$?.success?
+          say "Git clone command failed. Make sure git repository exists: #{git_path}", :red
           exit 1
         end
 
@@ -79,6 +89,25 @@ module Middleman::Cli
 
     protected
 
+    # Copied from Bundler
+    def git_present?
+      return @git_present if defined?(@git_present)
+      @git_present = which(GIT_CMD) || which("git.exe")
+    end
+
+    # Copied from Bundler
+    def which(executable)
+      if File.file?(executable) && File.executable?(executable)
+        executable
+      elsif ENV['PATH']
+        path = ENV['PATH'].split(File::PATH_SEPARATOR).find do |p|
+          abs_path = File.join(p, executable)
+          File.file?(abs_path) && File.executable?(abs_path)
+        end
+        path && File.expand_path(executable, path)
+      end
+    end
+
     def shortname?(repo)
       repo.split('/').length == 1
     end