1 files changed, 51 insertions, 12 deletions
diff --git a/lib/bundler/cli/list.rb b/lib/bundler/cli/list.rb
index d1799196e7..6a467f45a9 100644
--- a/lib/bundler/cli/list.rb
+++ b/lib/bundler/cli/list.rb
@@ -1,22 +1,63 @@
 # frozen_string_literal: true
 
+require "json"
+
 module Bundler
   class CLI::List
     def initialize(options)
       @options = options
+      @without_group = options["without-group"].map(&:to_sym)
+      @only_group = options["only-group"].map(&:to_sym)
+      @format = options["format"]
     end
 
     def run
-      raise InvalidOption, "The `--only-group` and `--without-group` options cannot be used together" if @options["only-group"] && @options["without-group"]
+      raise InvalidOption, "The `--only-group` and `--without-group` options cannot be used together" if @only_group.any? && @without_group.any?
 
       raise InvalidOption, "The `--name-only` and `--paths` options cannot be used together" if @options["name-only"] && @options[:paths]
 
-      specs = if @options["only-group"] || @options["without-group"]
+      specs = if @only_group.any? || @without_group.any?
         filtered_specs_by_groups
       else
-        Bundler.load.specs
+        begin
+          Bundler.load.specs
+        rescue GemNotFound => e
+          Bundler.ui.error e.message
+          Bundler.ui.warn "Install missing gems with `bundle install`."
+          exit 1
+        end
       end.reject {|s| s.name == "bundler" }.sort_by(&:name)
 
+      case @format
+      when "json"
+        print_json(specs: specs)
+      when nil
+        print_human(specs: specs)
+      else
+        raise InvalidOption, "Unknown option`--format=#{@format}`. Supported formats: `json`"
+      end
+    end
+
+    private
+
+    def print_json(specs:)
+      gems = if @options["name-only"]
+        specs.map {|s| { name: s.name } }
+      else
+        specs.map do |s|
+          {
+            name: s.name,
+            version: s.version.to_s,
+            git_version: s.git_version&.strip,
+          }.tap do |h|
+            h[:path] = s.full_gem_path if @options["paths"]
+          end
+        end
+      end
+      Bundler.ui.info({ gems: gems }.to_json)
+    end
+
+    def print_human(specs:)
       return Bundler.ui.info "No gems in the Gemfile" if specs.empty?
 
       return specs.each {|s| Bundler.ui.info s.name } if @options["name-only"]
@@ -29,12 +70,10 @@ module Bundler
       Bundler.ui.info "Use `bundle info` to print more detailed information about a gem"
     end
 
-  private
-
     def verify_group_exists(groups)
-      raise InvalidOption, "`#{@options["without-group"]}` group could not be found." if @options["without-group"] && !groups.include?(@options["without-group"].to_sym)
-
-      raise InvalidOption, "`#{@options["only-group"]}` group could not be found." if @options["only-group"] && !groups.include?(@options["only-group"].to_sym)
+      (@without_group + @only_group).each do |group|
+        raise InvalidOption, "`#{group}` group could not be found." unless groups.include?(group)
+      end
     end
 
     def filtered_specs_by_groups
@@ -44,10 +83,10 @@ module Bundler
       verify_group_exists(groups)
 
       show_groups =
-        if @options["without-group"]
-          groups.reject {|g| g == @options["without-group"].to_sym }
-        elsif @options["only-group"]
-          groups.select {|g| g == @options["only-group"].to_sym }
+        if @without_group.any?
+          groups.reject {|g| @without_group.include?(g) }
+        elsif @only_group.any?
+          groups.select {|g| @only_group.include?(g) }
         else
           groups
         end.map(&:to_sym)