Add support for pre-commit package manager

lib/bibliothecary/parsers/pre_commit.rb

@@ -0,0 +1,44 @@
+require "yaml"
+
+module Bibliothecary
+    module Parsers
+        class PreCommit
+            include Bibliothecary::Analyser
+
+            def self.mapping
+                {
+                    match_filename(".pre-commit-config.yaml") => {
+                        kind: "manifest",
+                        parser: :parser_manifest,
+                    }
+                }
+            end
+
+            def self.parser_manifest(file_contents)
+                manifest = YAML.load(file_contents)
+
+                return [] unless manifest
+                return [] unless manifest["repos"]
+
+                manifest["repos"].map do |repo|
+                    if (
+                        repo["repo"] and
+                        repo["rev"] and
+                        repo["hooks"] and
+                        not ["meta", "local"].include?(repo["repo"])
+                    )
+                        repo.fetch("hooks", []).map do |hook|
+                            {
+                                name: hook["id"],
+                                requirement: repo["rev"],
+                                type: "runtime",
+                            }
+                        end
+                    else
+                        []
+                    end
+                end.flatten
+            end
+        end
+    end
+end

spec/bibliothecary_spec.rb

@@ -27,6 +27,7 @@
           Bibliothecary::Parsers::NPM,
           Bibliothecary::Parsers::Nuget,
           Bibliothecary::Parsers::Packagist,
+          Bibliothecary::Parsers::PreCommit,
           Bibliothecary::Parsers::Pub,
           Bibliothecary::Parsers::Pypi,
           Bibliothecary::Parsers::Rubygems,
@@ -270,6 +271,12 @@
                             :kind=>"manifest",
                             :success=>true,
                             :related_paths=>[]},
+                            {:platform=>"precommit",
+                            :path=>".pre-commit-config.yaml",
+                            :dependencies=>[],
+                            :kind=>"manifest",
+                            :success=>true,
+                            :related_paths=>[]},
                            {:platform=>"rubygems",
                             :path=>"Gemfile",
                             :dependencies=>[],

spec/fixtures/.pre-commit-config.yaml

@@ -0,0 +1,23 @@
+repos:
+    - repo: https://github.com/pre-commit/pre-commit-hooks
+      rev: v2.3.0
+      hooks:
+          - id: check-yaml
+          - id: end-of-file-fixer
+          - id: trailing-whitespace
+    - repo: https://github.com/psf/black
+      rev: 19.3b0
+      hooks:
+          - id: black
+    - repo: meta
+      hooks:
+          - id: check-hooks-apply
+          - id: check-useless-excludes
+    - repo: local
+      hooks:
+          - id: scss-lint
+            name: scss-lint
+            entry: scss-lint
+            types: [scss]
+            language: ruby
+            additional_dependencies: ['scss_lint:0.57.0']

spec/fixtures/broken/.pre-commit-config_hooks.yaml

@@ -0,0 +1,4 @@
+repos:
+    - repo: https://github.com/pre-commit/pre-commit-hooks
+      rev: v2.3.0
+      hooks:

spec/fixtures/broken/.pre-commit-config_repos.yaml

@@ -0,0 +1 @@
+repos:

spec/parsers/pre_commit_spec.rb

@@ -0,0 +1,42 @@
+require "spec_helper"
+
+describe Bibliothecary::Parsers::PreCommit do
+    it "has a platform name" do
+        expect(described_class.platform_name).to eq("precommit")
+    end
+
+    it "parses dependencies from .pre-commit-config.yaml" do
+        expect(described_class.analyse_contents(".pre-commit-config.yaml", load_fixture(".pre-commit-config.yaml"))).to eq({
+          :platform=>"precommit",
+          :path=>".pre-commit-config.yaml",
+          :dependencies=>[
+            {:name=>"check-yaml", :requirement=>"v2.3.0", :type=>"runtime"},
+            {:name=>"end-of-file-fixer", :requirement=>"v2.3.0", :type=>"runtime"},
+            {:name=>"trailing-whitespace", :requirement=>"v2.3.0", :type=>"runtime"},
+            {:name=>"black", :requirement=>"19.3b0", :type=>"runtime"},
+          ],
+          kind: 'manifest',
+          success: true,
+        })
+    end
+
+    it "parses dependencies from .pre-commit-config.yaml without repos" do
+        expect(described_class.analyse_contents(".pre-commit-config.yaml", load_fixture("broken/.pre-commit-config_repos.yaml"))).to eq({
+          :platform=>"precommit",
+          :path=>".pre-commit-config.yaml",
+          :dependencies=>[],
+          kind: 'manifest',
+          success: true,
+        })
+    end
+
+    it "parses dependencies from .pre-commit-config.yaml without hooks" do
+        expect(described_class.analyse_contents(".pre-commit-config.yaml", load_fixture("broken/.pre-commit-config_hooks.yaml"))).to eq({
+          :platform=>"precommit",
+          :path=>".pre-commit-config.yaml",
+          :dependencies=>[],
+          kind: 'manifest',
+          success: true,
+        })
+    end
+end