Completely remove `bundle inject` command

9 files changed, 12 insertions, 255 deletions

diff --git a/lib/bundler/cli.rb b/lib/bundler/cli.rb
index c17dda30f3..38264c6ebe 100644
--- a/lib/bundler/cli.rb
+++ b/lib/bundler/cli.rb
@@ -575,12 +575,8 @@ module Bundler
     end
 
     desc "inject GEM VERSION", "Add the named gem, with version requirements, to the resolved Gemfile", hide: true
-    method_option "source", type: :string, banner: "Install gem from the given source"
-    method_option "group", type: :string, banner: "Install gem into a bundler group"
-    def inject(name, version)
-      SharedHelpers.major_deprecation 2, "The `inject` command has been replaced by the `add` command"
-      require_relative "cli/inject"
-      Inject.new(options.dup, name, version).run
+    def inject(*)
+      SharedHelpers.feature_removed! "The `inject` command has been replaced by the `add` command"
     end
 
     desc "lock", "Creates a lockfile without installing"
diff --git a/lib/bundler/cli/inject.rb b/lib/bundler/cli/inject.rb
deleted file mode 100644
index a09d5c6bda..0000000000
--- a/lib/bundler/cli/inject.rb
+++ /dev/null
@@ -1,60 +0,0 @@
-# frozen_string_literal: true
-
-module Bundler
-  class CLI::Inject
-    attr_reader :options, :name, :version, :group, :source, :gems
-    def initialize(options, name, version)
-      @options = options
-      @name = name
-      @version = version || last_version_number
-      @group = options[:group].split(",") unless options[:group].nil?
-      @source = options[:source]
-      @gems = []
-    end
-
-    def run
-      # The required arguments allow Thor to give useful feedback when the arguments
-      # are incorrect. This adds those first two arguments onto the list as a whole.
-      gems.unshift(source).unshift(group).unshift(version).unshift(name)
-
-      # Build an array of Dependency objects out of the arguments
-      deps = []
-      # when `inject` support addition of more than one gem, then this loop will
-      # help. Currently this loop is running once.
-      gems.each_slice(4) do |gem_name, gem_version, gem_group, gem_source|
-        ops = Gem::Requirement::OPS.map {|key, _val| key }
-        has_op = ops.any? {|op| gem_version.start_with? op }
-        gem_version = "~> #{gem_version}" unless has_op
-        deps << Bundler::Dependency.new(gem_name, gem_version, "group" => gem_group, "source" => gem_source)
-      end
-
-      added = Injector.inject(deps, options)
-
-      if added.any?
-        Bundler.ui.confirm "Added to Gemfile:"
-        Bundler.ui.confirm(added.map do |d|
-          name = "'#{d.name}'"
-          requirement = ", '#{d.requirement}'"
-          group = ", group: #{d.groups.inspect}" if d.groups != Array(:default)
-          source = ", source: '#{d.source}'" unless d.source.nil?
-          %(gem #{name}#{requirement}#{group}#{source})
-        end.join("\n"))
-      else
-        Bundler.ui.confirm "All gems were already present in the Gemfile"
-      end
-    end
-
-    private
-
-    def last_version_number
-      definition = Bundler.definition(true)
-      definition.remotely!
-      specs = definition.index[name].sort_by(&:version)
-      unless options[:pre]
-        specs.delete_if {|b| b.respond_to?(:version) && b.version.prerelease? }
-      end
-      spec = specs.last
-      spec.version.to_s
-    end
-  end
-end
diff --git a/lib/bundler/man/bundle-inject.1 b/lib/bundler/man/bundle-inject.1
deleted file mode 100644
index 7e30e26a4e..0000000000
--- a/lib/bundler/man/bundle-inject.1
+++ /dev/null
@@ -1,31 +0,0 @@
-.\" generated with Ronn-NG/v0.10.1
-.\" http://github.com/apjanke/ronn-ng/tree/0.10.1
-.TH "BUNDLE\-INJECT" "1" "August 2025" ""
-.SH "NAME"
-\fBbundle\-inject\fR \- Add named gem(s) with version requirements to Gemfile
-.SH "SYNOPSIS"
-\fBbundle inject\fR [GEM] [VERSION] [\-\-source=SOURCE] [\-\-group=GROUP]
-.SH "DESCRIPTION"
-Adds the named gem(s) with their version requirements to the resolved [\fBGemfile(5)\fR][Gemfile(5)]\.
-.P
-This command will add the gem to both your [\fBGemfile(5)\fR][Gemfile(5)] and Gemfile\.lock if it isn't listed yet\.
-.P
-Example:
-.IP "" 4
-.nf
-bundle install
-bundle inject 'rack' '> 0'
-.fi
-.IP "" 0
-.P
-This will inject the 'rack' gem with a version greater than 0 in your [\fBGemfile(5)\fR][Gemfile(5)] and Gemfile\.lock\.
-.P
-The \fBbundle inject\fR command was deprecated in Bundler 2\.1 and will be removed in Bundler 4\.0\.
-.SH "OPTIONS"
-.TP
-\fB\-\-source=SOURCE\fR
-Install gem from the given source\.
-.TP
-\fB\-\-group=GROUP\fR
-Install gem into a bundler group\.
-
diff --git a/lib/bundler/man/bundle-inject.1.ronn b/lib/bundler/man/bundle-inject.1.ronn
deleted file mode 100644
index 7f6f0fb5b6..0000000000
--- a/lib/bundler/man/bundle-inject.1.ronn
+++ /dev/null
@@ -1,32 +0,0 @@
-bundle-inject(1) -- Add named gem(s) with version requirements to Gemfile
-=========================================================================
-
-## SYNOPSIS
-
-`bundle inject` [GEM] [VERSION] [--source=SOURCE] [--group=GROUP]
-
-## DESCRIPTION
-
-Adds the named gem(s) with their version requirements to the resolved
-[`Gemfile(5)`][Gemfile(5)].
-
-This command will add the gem to both your [`Gemfile(5)`][Gemfile(5)] and Gemfile.lock if it
-isn't listed yet.
-
-Example:
-
-    bundle install
-    bundle inject 'rack' '> 0'
-
-This will inject the 'rack' gem with a version greater than 0 in your
-[`Gemfile(5)`][Gemfile(5)] and Gemfile.lock.
-
-The `bundle inject` command was deprecated in Bundler 2.1 and will be removed in Bundler 4.0.
-
-## OPTIONS
-
-* `--source=SOURCE`:
-  Install gem from the given source.
-
-* `--group=GROUP`:
-  Install gem into a bundler group.
diff --git a/lib/bundler/man/bundle.1 b/lib/bundler/man/bundle.1
index f87a98150d..9bee76e58b 100644
--- a/lib/bundler/man/bundle.1
+++ b/lib/bundler/man/bundle.1
@@ -94,9 +94,3 @@ Manage Bundler plugins
 Prints Bundler version information
 .SH "PLUGINS"
 When running a command that isn't listed in PRIMARY COMMANDS or UTILITIES, Bundler will try to find an executable on your path named \fBbundler\-<command>\fR and execute it, passing down any extra arguments to it\.
-.SH "OBSOLETE"
-These commands are obsolete and should no longer be used:
-.IP "\(bu" 4
-\fBbundle inject(1)\fR
-.IP "" 0
-
diff --git a/lib/bundler/man/bundle.1.ronn b/lib/bundler/man/bundle.1.ronn
index 8245effabd..f368b32276 100644
--- a/lib/bundler/man/bundle.1.ronn
+++ b/lib/bundler/man/bundle.1.ronn
@@ -108,9 +108,3 @@ We divide `bundle` subcommands into primary commands and utilities:
 When running a command that isn't listed in PRIMARY COMMANDS or UTILITIES,
 Bundler will try to find an executable on your path named `bundler-<command>`
 and execute it, passing down any extra arguments to it.
-
-## OBSOLETE
-
-These commands are obsolete and should no longer be used:
-
-* `bundle inject(1)`
diff --git a/lib/bundler/man/index.txt b/lib/bundler/man/index.txt
index 3ea3495f1b..6cc5eb24cd 100644
--- a/lib/bundler/man/index.txt
+++ b/lib/bundler/man/index.txt
@@ -15,7 +15,6 @@ bundle-gem(1)         bundle-gem.1
 bundle-help(1)        bundle-help.1
 bundle-info(1)        bundle-info.1
 bundle-init(1)        bundle-init.1
-bundle-inject(1)      bundle-inject.1
 bundle-install(1)     bundle-install.1
 bundle-issue(1)       bundle-issue.1
 bundle-licenses(1)    bundle-licenses.1
diff --git a/spec/bundler/commands/inject_spec.rb b/spec/bundler/commands/inject_spec.rb
deleted file mode 100644
index c39c2ae35b..0000000000
--- a/spec/bundler/commands/inject_spec.rb
+++ /dev/null
@@ -1,113 +0,0 @@
-# frozen_string_literal: true
-
-RSpec.describe "bundle inject" do
-  before :each do
-    gemfile <<-G
-      source "https://gem.repo1"
-      gem "myrack"
-    G
-  end
-
-  context "without a lockfile" do
-    it "locks with the injected gems" do
-      expect(bundled_app_lock).not_to exist
-      bundle "inject 'myrack-obama' '> 0'"
-      expect(bundled_app_lock.read).to match(/myrack-obama/)
-    end
-  end
-
-  context "with a lockfile" do
-    before do
-      bundle "install"
-    end
-
-    it "adds the injected gems to the Gemfile" do
-      expect(bundled_app_gemfile.read).not_to match(/myrack-obama/)
-      bundle "inject 'myrack-obama' '> 0'"
-      expect(bundled_app_gemfile.read).to match(/myrack-obama/)
-    end
-
-    it "locks with the injected gems" do
-      expect(bundled_app_lock.read).not_to match(/myrack-obama/)
-      bundle "inject 'myrack-obama' '> 0'"
-      expect(bundled_app_lock.read).to match(/myrack-obama/)
-    end
-  end
-
-  context "with injected gems already in the Gemfile" do
-    it "doesn't add existing gems" do
-      bundle "inject 'myrack' '> 0'", raise_on_error: false
-      expect(err).to match(/cannot specify the same gem twice/i)
-    end
-  end
-
-  context "incorrect arguments" do
-    it "fails when more than 2 arguments are passed" do
-      bundle "inject gem_name 1 v", raise_on_error: false
-      expect(err).to eq(<<-E.strip)
-ERROR: "bundle inject" was called with arguments ["gem_name", "1", "v"]
-Usage: "bundle inject GEM VERSION"
-      E
-    end
-  end
-
-  context "with source option" do
-    it "add gem with source option in gemfile" do
-      bundle "inject 'foo' '>0' --source https://gem.repo1"
-      gemfile = bundled_app_gemfile.read
-      str = "gem \"foo\", \"> 0\", source: \"https://gem.repo1\""
-      expect(gemfile).to include str
-    end
-  end
-
-  context "with group option" do
-    it "add gem with group option in gemfile" do
-      bundle "inject 'myrack-obama' '>0' --group=development"
-      gemfile = bundled_app_gemfile.read
-      str = "gem \"myrack-obama\", \"> 0\", group: :development"
-      expect(gemfile).to include str
-    end
-
-    it "add gem with multiple groups in gemfile" do
-      bundle "inject 'myrack-obama' '>0' --group=development,test"
-      gemfile = bundled_app_gemfile.read
-      str = "gem \"myrack-obama\", \"> 0\", groups: [:development, :test]"
-      expect(gemfile).to include str
-    end
-  end
-
-  context "when frozen" do
-    before do
-      bundle "install"
-      bundle "config set --local frozen true"
-    end
-
-    it "injects anyway" do
-      bundle "inject 'myrack-obama' '> 0'"
-      expect(bundled_app_gemfile.read).to match(/myrack-obama/)
-    end
-
-    it "locks with the injected gems" do
-      expect(bundled_app_lock.read).not_to match(/myrack-obama/)
-      bundle "inject 'myrack-obama' '> 0'"
-      expect(bundled_app_lock.read).to match(/myrack-obama/)
-    end
-
-    it "restores frozen afterwards" do
-      bundle "inject 'myrack-obama' '> 0'"
-      config = Psych.load(bundled_app(".bundle/config").read)
-      expect(config["BUNDLE_DEPLOYMENT"] || config["BUNDLE_FROZEN"]).to eq("true")
-    end
-
-    it "doesn't allow Gemfile changes" do
-      gemfile <<-G
-        source "https://gem.repo1"
-        gem "myrack-obama"
-      G
-      bundle "inject 'myrack' '> 0'", raise_on_error: false
-      expect(err).to match(/the lockfile can't be updated because frozen mode is set/)
-
-      expect(bundled_app_lock.read).not_to match(/myrack-obama/)
-    end
-  end
-end
diff --git a/spec/bundler/other/major_deprecation_spec.rb b/spec/bundler/other/major_deprecation_spec.rb
index d57abe45f3..d17770d00c 100644
--- a/spec/bundler/other/major_deprecation_spec.rb
+++ b/spec/bundler/other/major_deprecation_spec.rb
@@ -653,6 +653,16 @@ RSpec.describe "major deprecations" do
     pending "fails with a helpful message", bundler: "4"
   end
 
+  context "bundle inject" do
+    before do
+      bundle "inject", raise_on_error: false
+    end
+
+    it "fails with a helpful message" do
+      expect(err).to include "The `inject` command has been replaced by the `add` command"
+    end
+  end
+
   context "bundle plugin install --local_git" do
     before do
       build_git "foo" do |s|