feat(renovate): add regex manager for conda env pins

renovate-config.json5

@@ -213,6 +213,21 @@
       ],
       "versioningTemplate": "{{#if versioning}}{{{versioning}}}{{/if}}",
     },
+    // Pinned conda-forge dependencies in Conda environment files.
+    {
+      "customType": "regex",
+      "description": "Update pinned conda-forge dependencies in Conda environment files",
+      "managerFilePatterns": [
+        "/(^|/)environment[.]ya?ml$/",
+      ],
+      "matchStrings": [
+        "(?<indentation>[ \\t]*)-[ \\t]*(?<depName>[A-Za-z0-9_.-]+)[ \\t]*=[ \\t]*(?<currentValue>[^=\\s#][^\\s#]*)",
+      ],
+      "datasourceTemplate": "conda",
+      "packageNameTemplate": "conda-forge/{{{depName}}}",
+      "versioningTemplate": "conda",
+      "autoReplaceStringTemplate": "{{{indentation}}}- {{{depName}}}={{{newVersion}}}",
+    },
     // CPM Package Lock
     {
       "customType": "regex",

tests/renovate-config.test.mjs

@@ -5,6 +5,7 @@ import test from 'node:test';
 import JSON5 from 'json5';
 import {extractPackageFile as extractCdnUrlPackageFile} from 'renovate/dist/modules/manager/cdnurl/index.js';
 import {extractPackageFile as extractRegexPackageFile} from 'renovate/dist/modules/manager/custom/regex/index.js';
+import {compile} from 'renovate/dist/util/template/index.js';
 
 const renovateConfig = JSON5.parse(fs.readFileSync('renovate-config.json5', 'utf8'));
 const githubRefManager = renovateConfig.customManagers.find(
@@ -18,6 +19,10 @@ const sourceNpmCdnManager = renovateConfig.customManagers.find(
   manager => manager.datasourceTemplate === 'npm'
     && manager.managerFilePatterns.some(pattern => pattern.includes('docs/source/conf')),
 );
+const condaEnvironmentManager = renovateConfig.customManagers.find(
+  manager => manager.datasourceTemplate === 'conda'
+    && manager.managerFilePatterns.some(pattern => pattern.includes('environment')),
+);
 
 function matchesManagerFilePattern(fileName, patterns) {
   return patterns.some(pattern => {
@@ -56,6 +61,16 @@ function extractGitHubRefDependencies(fileName, content) {
   }));
 }
 
+function extractCondaDependencies(fileName, content) {
+  assert.ok(condaEnvironmentManager, 'Expected to find the Conda environment custom manager');
+  assert.ok(
+    matchesManagerFilePattern(fileName, condaEnvironmentManager.managerFilePatterns),
+    `Expected the Conda environment manager to scan ${fileName}`,
+  );
+
+  return extractRegexPackageFile(content, fileName, condaEnvironmentManager)?.deps ?? [];
+}
+
 test('extracts the actionlint release and jsDelivr commit', () => {
   const fileName = '.github/workflows/__call-common-lint.yml';
   const content = fs.readFileSync(fileName, 'utf8');
@@ -90,6 +105,64 @@ test('extracts a GitHub branch and jsDelivr commit from a composite action', ()
   );
 });
 
+test('extracts and updates pinned conda-forge dependencies from environment files', () => {
+  const fileName = 'environment.yml';
+  const content = `
+---
+name: RTD
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - doxygen=1.2.3
+  - graphviz = 4.5.6  # Keep an inline comment.
+  - nodejs
+  - pip:
+      - example==7.8.9
+`;
+  const dependencies = extractCondaDependencies(fileName, content);
+
+  assert.deepEqual(
+    dependencies.map(dependency => ({
+      currentValue: dependency.currentValue,
+      datasource: dependency.datasource,
+      depName: dependency.depName,
+      packageName: dependency.packageName,
+      versioning: dependency.versioning,
+    })),
+    [
+      {
+        currentValue: '1.2.3',
+        datasource: 'conda',
+        depName: 'doxygen',
+        packageName: 'conda-forge/doxygen',
+        versioning: 'conda',
+      },
+      {
+        currentValue: '4.5.6',
+        datasource: 'conda',
+        depName: 'graphviz',
+        packageName: 'conda-forge/graphviz',
+        versioning: 'conda',
+      },
+    ],
+  );
+
+  const dependency = dependencies[0];
+  const newVersion = nextTestVersion(dependency.currentValue);
+  const updatedReplaceString = compile(
+    condaEnvironmentManager.autoReplaceStringTemplate,
+    {...dependency, newVersion},
+    false,
+  );
+  const updatedContent = content.replace(dependency.replaceString, updatedReplaceString);
+  const updatedDependencies = extractCondaDependencies(fileName, updatedContent);
+
+  assert.equal(updatedDependencies[0].currentValue, newVersion);
+  assert.match(updatedContent, new RegExp(`  - doxygen=${newVersion.replaceAll('.', '\\.')}`));
+  assert.match(updatedContent, /  - graphviz = 4\.5\.6  # Keep an inline comment\./);
+});
+
 function nextTestVersion(currentValue) {
   const match = /^(.*?)(\d+)$/.exec(currentValue);
   assert.ok(match, `Expected a version ending in a number: ${currentValue}`);