Version determiner

.github/workflows/build.yaml

@@ -56,19 +56,34 @@ jobs:
       - uses: denoland/setup-deno@v1
         with:
           deno-version: v1.x
+      - id: determine-version
+        run: deno run -A scripts/determine-version.ts
+      - if: github.ref_type == 'tag'
+        run: '[[ "$VERSION" = "$GITHUB_REF_NAME" ]]'
+        env:
+          VERSION: ${{ steps.determine-version.outputs.version }}
       - run: deno install -Af --unstable https://x.nest.land/eggs@0.3.10/eggs.ts
       - run: "eggs link '${{ secrets.NEST_API_KEY }}'"
+      - if: github.ref_type == 'tag'
+        uses: mikefarah/yq@master
+        with:
+          cmd: >-
+            yq -i
+            ' strenv(GITHUB_REF_NAME) as $version
+            | .version = $version
+            | .unstable = false'
+            egg.yaml
       - if: github.ref_type != 'tag'
         uses: mikefarah/yq@master
         with:
           cmd: >-
             yq -i
-            ' strenv(GITHUB_RUN_NUMBER) as $run-number
-            | strenv(GITHUB_SHA) as $sha
-            | .version = .version + "-dev." + $run-number + "+" + $sha
-            | .version |= (match("^[^+]+\+[a-f0-9]{7}") | .string)
+            ' strenv(VERSION) as $version
+            | .version = $version
             | .unstable = true'
             egg.yaml
+        env:
+          VERSION: ${{ steps.determine-version.outputs.version }}
       - run: |
           # Try up to 3 times as `eggs publish` frequently fails due to unknown
           # reason (I guess it's a bug on the server side):

egg.yaml

@@ -2,7 +2,6 @@ $schema: https://x.nest.land/eggs@0.3.10/src/schema.json
 name: aitertools
 description: Well-tested utility functions dealing with async iterables
 homepage: https://github.com/dahlia/aitertools
-version: 0.5.0
 releaseType: null
 unstable: false
 unlisted: false

scripts/determine-version.ts

@@ -0,0 +1,68 @@
+import {
+  dirname,
+  fromFileUrl,
+  join,
+} from "https://deno.land/std@0.207.0/path/mod.ts";
+import * as commonmark from "npm:commonmark";
+
+const projectDir = dirname(dirname(fromFileUrl(import.meta.url)));
+const changelogPath = join(projectDir, "CHANGES.md");
+
+function findTopmostVersion(node: typeof commonmark.Node): string {
+  const walker = node.walker();
+  while (true) {
+    const event = walker.next();
+    if (!event) break;
+    const node = event.node;
+    if (
+      node.type == "heading" && node.level == 2 &&
+      node.firstChild.type == "text" &&
+      node.firstChild.literal.startsWith("Version")
+    ) {
+      return node.firstChild.literal.replace(/^Version\s+/, "").trim();
+    }
+  }
+
+  throw new Error("Version not found");
+}
+
+async function findLatestVersionFromChangelog(path: string): Promise<string> {
+  const parser = new commonmark.Parser();
+  const text = await Deno.readTextFile(path);
+  const tree = parser.parse(text);
+  return findTopmostVersion(tree);
+}
+
+function determineVersionSuffix(): string {
+  const runNo = Deno.env.get("GITHUB_RUN_NUMBER");
+  const commitSha = Deno.env.get("GITHUB_SHA");
+  return `dev.${runNo}+${commitSha?.substring(0, 7)}`;
+}
+
+async function output(name: string, value: string): Promise<void> {
+  const outputPath = Deno.env.get("GITHUB_OUTPUT");
+  if (Deno.env.get("GITHUB_ACTIONS") === "true" && outputPath != null) {
+    const escaped = value
+      .replace(/%/g, "%25")
+      .replace(/\r/g, "%0D")
+      .replace(/\n/g, "%0A");
+    await Deno.writeTextFile(outputPath, `${name}=${escaped}\n`);
+  } else {
+    console.log(value);
+  }
+}
+
+async function main() {
+  const baseVersion = await findLatestVersionFromChangelog(changelogPath);
+  if (
+    Deno.env.get("GITHUB_ACTIONS") === "true" &&
+    Deno.env.get("GITHUB_REF_TYPE") === "branch"
+  ) {
+    const version = `${baseVersion}-${determineVersionSuffix()}`;
+    await output("version", version);
+  } else {
+    await output("version", baseVersion);
+  }
+}
+
+if (import.meta.main) await main();