add coursier (jvm) as a language

testing/gen-languages-all

@@ -2,7 +2,7 @@
 import sys
 
 LANGUAGES = [
-    'conda', 'docker', 'dotnet', 'docker_image', 'fail', 'golang',
+    'conda', 'coursier', 'docker', 'dotnet', 'docker_image', 'fail', 'golang',
     'node', 'perl', 'pygrep', 'python', 'ruby', 'rust', 'script', 'swift',
     'system',
 ]

testing/get-coursier.ps1

@@ -0,0 +1,11 @@
+$wc = New-Object System.Net.WebClient
+
+$coursier_url = "https://github.com/coursier/coursier/releases/download/v2.0.5/cs-x86_64-pc-win32.exe"
+$coursier_dest = "C:\coursier\cs.exe"
+$coursier_hash ="d63d497f7805261e1cd657b8aaa626f6b8f7264cdb68219b2e6be9dd882033a9"
+
+New-Item -Path "C:\" -Name "coursier" -ItemType "directory"
+$wc.DownloadFile($coursier_url, $coursier_dest)
+if ((Get-FileHash $coursier_dest -Algorithm SHA256).Hash -ne $coursier_hash) {
+    throw "Invalid coursier file"
+}

testing/get-coursier.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# This is a script used in CI to install coursier
+set -euxo pipefail
+
+COURSIER_URL="https://github.com/coursier/coursier/releases/download/v2.0.0/cs-x86_64-pc-linux"
+COURSIER_HASH="e2e838b75bc71b16bcb77ce951ad65660c89bda7957c79a0628ec7146d35122f"
+ARTIFACT="/tmp/coursier/cs"
+
+mkdir -p /tmp/coursier
+rm -f "$ARTIFACT"
+curl --location --silent --output "$ARTIFACT" "$COURSIER_URL"
+echo "$COURSIER_HASH  $ARTIFACT" | sha256sum --check
+chmod ugo+x /tmp/coursier/cs

testing/resources/coursier_hooks_repo/.pre-commit-channel/echo-java.json

@@ -0,0 +1,8 @@
+{
+  "repositories": [
+    "central"
+  ],
+  "dependencies": [
+    "io.get-coursier:echo:latest.stable"
+  ]
+}

testing/resources/coursier_hooks_repo/.pre-commit-hooks.yaml

@@ -0,0 +1,5 @@
+-   id: echo-java
+    name: echo-java
+    description: echo from java
+    entry: echo-java
+    language: coursier

testing/util.py

@@ -40,6 +40,10 @@ def cmd_output_mocked_pre_commit_home(
     return ret, out.replace('\r\n', '\n'), None
 
 
+skipif_cant_run_coursier = pytest.mark.skipif(
+    os.name == 'nt' or parse_shebang.find_executable('cs') is None,
+    reason="coursier isn't installed or can't be found",
+)
 skipif_cant_run_docker = pytest.mark.skipif(
     os.name == 'nt' or not docker_is_running(),
     reason="Docker isn't running or can't be accessed",