Add support for pre-commit package manager

app/models/package_manager/pre_commit.rb

@@ -0,0 +1,43 @@
+module PackageManager
+  class PreCommit < Base
+    HAS_VERSIONS = false
+    HAS_DEPENDENCIES = false
+    BIBLIOTHECARY_SUPPORT = true
+    URL = "https://pre-commit.com/"
+    COLOR = "#3572A5"
+
+    def self.project_names
+      get("https://pre-commit.com/all-hooks.json")
+        .values
+        .flatten
+        .map { |hook| hook["id"] }
+    end
+
+    def self.project(name)
+      repo = get("https://pre-commit.com/all-hooks.json")
+        .find { |repo,hooks| hooks.any? { |hook| hook["id"] == name } }
+
+      hook = repo[1]
+        .find { |hook| hook["id"] == name }
+
+      {
+        repo: repo[0],
+        id: hook["id"],
+        language: hook["language"],
+        description: hook.fetch("description", ""),
+      }
+    end
+
+    def self.mapping(project)
+      {
+        name: project[:id],
+        description: project[:description],
+        repository_url: project[:repo],
+      }
+    end
+
+    def self.formatted_name
+      "pre-commit"
+    end
+  end
+end

lib/tasks/download.rake

@@ -232,6 +232,16 @@ namespace :download do
     PackageManager::PlatformIO.import_async
   end
 
+  desc "Download new pre-commit packages asynchronously"
+  task precommit: :environment do
+    PackageManager::PreCommit.import_new_async
+  end
+
+  desc "Download all pre-commit packages asynchronously"
+  task precommit_all: :environment do
+    PackageManager::PreCommit.import_async
+  end
+
   desc "Download new PureScript packages asynchronously"
   task purescript: :environment do
     PackageManager::PureScript.import_new_async

spec/models/package_manager/pre_commit_spec.rb

@@ -0,0 +1,43 @@
+require "rails_helper"
+
+describe PackageManager::PreCommit do
+    describe "#project_names" do
+        it "resolves projects correctly" do
+            VCR.use_cassette("all-hooks") do
+                project_names = described_class.project_names
+
+                expect(project_names).to eq ["check-added-large-files", "check-ast", "autopep8"]
+            end
+        end
+    end
+
+    describe "#mapping" do
+        it "maps project data correctly" do
+            VCR.use_cassette("all-hooks") do
+                project = described_class.project("check-ast")
+                mapping = described_class.mapping(project)
+
+                expect(mapping[:name]).to eq "check-ast"
+                expect(mapping[:description]).to eq "Simply check whether the files parse as valid python."
+                expect(mapping[:repository_url]).to eq "https://github.com/pre-commit/pre-commit-hooks"
+            end
+        end
+
+        it "uses correct description fallback" do
+            VCR.use_cassette("all-hooks") do
+                project = described_class.project("autopep8")
+                mapping = described_class.mapping(project)
+
+                expect(mapping[:name]).to eq "autopep8"
+                expect(mapping[:description]).to eq ""
+                expect(mapping[:repository_url]).to eq "https://github.com/pre-commit/mirrors-autopep8"
+            end
+        end
+    end
+
+    describe "#formatted_name" do
+        it 'has a formatted name of "pre-commit"' do
+            expect(described_class.formatted_name).to eq("pre-commit")
+        end
+    end
+end