Pick what needed tags need too, and put Left behind in the release post

docs/page.md

@@ -113,7 +113,8 @@ Those issues show their key and summary too, and the services they miss sit unde
 A service that needs a tag has a **Pick** button for it, which picks the tag without opening the service. `no tag yet`
 links to create the next tag, and `not merged`, `merged into <branch>`, and `in prod or not merged` link to the merge
 requests or commits. When any line needs a tag, a button next to the title picks every needed tag at once, the newest
-one per service. A newer pick can ship more tasks, and the list then shows what those leave behind.
+one per service. A needed tag can ship more tasks that need tags of their own, so the button also picks those, and its
+count includes them.
 
 Changes already in production and closed merge requests are not listed. Other relations, such as `blocks`,
 `relates to`, or a parent, do not hold a release back; they show only when you hover over the issue's key.
@@ -129,4 +130,6 @@ allow the copy button only over HTTPS.
 - **Compare**: a GitLab compare link per service from production to the picked tag, as a Markdown list. A service
   never deployed to production gets the tag's commit history instead.
 - **Release post**: one Markdown text with a line per picked tag, holding its compare link and pipeline, followed by
-  the Jira tasks with their summaries.
+  the Jira tasks with their summaries. When the picks leave something behind, a **Left behind** section follows with
+  the same groups as the list above: each task, the services it misses with the reason and links to the merge
+  requests, and the issues it depends on.

release_scope/_static/index.html

@@ -583,6 +583,7 @@ <h2 x-text="t('release')"></h2>
       postServices: "**Services**",
       postTasks: "**Jira tasks ({count})**",
       postNone: "- none",
+      postGaps: "**Left behind ({count})**",
       postPipeline: "pipeline #{id}",
       legend: "Legend: ✅ success · ❌ failed · 🔄 running · ⏭ canceled or skipped · ⚠️ no pipeline",
       chooseIssues: "Issues",
@@ -693,6 +694,7 @@ <h2 x-text="t('release')"></h2>
       postServices: "**Сервисы**",
       postTasks: "**Задачи Jira ({count})**",
       postNone: "- нет",
+      postGaps: "**Не войдёт в релиз ({count})**",
       postPipeline: "пайплайн #{id}",
       legend: "Обозначения: ✅ прошёл · ❌ упал · 🔄 выполняется · ⏭ отменён или пропущен · ⚠️ нет пайплайна",
       chooseIssues: "Задачи",
@@ -965,16 +967,22 @@ <h2 x-text="t('release')"></h2>
         return jira && jira.error ? [jira.error] : [];
       },
       get picked() {
+        return this.pickedFor(this.picks);
+      },
+      pickedFor(picks) {
         return this.pickable
           .map((service) => ({
             service,
-            candidate: this.pickOf(service),
+            candidate: service.candidates.find((item) => item.tag.name === picks[service.project]),
           }))
           .filter((item) => item.candidate);
       },
       get tasks() {
+        return this.tasksOf(this.picked);
+      },
+      tasksOf(picked) {
         const tasks = new Map();
-        for (const { service, candidate } of this.picked) {
+        for (const { service, candidate } of picked) {
           const shipped = service.rows.slice(this.tagRow(service, candidate.tag.name)).filter((row) => row.in_scope);
           for (const key of candidate.jira_keys) {
             if (!tasks.has(key.key)) tasks.set(key.key, { key: key.key, url: key.url, issue: this.issue(key.key), sources: [] });
@@ -988,10 +996,13 @@ <h2 x-text="t('release')"></h2>
         return [...tasks.values()];
       },
       get gaps() {
-        const starts = new Map(this.picked.map(({ service, candidate }) => [service.project, this.tagRow(service, candidate.tag.name)]));
+        return this.gapsOf(this.picked);
+      },
+      gapsOf(picked) {
+        const starts = new Map(picked.map(({ service, candidate }) => [service.project, this.tagRow(service, candidate.tag.name)]));
         const lines = (key) =>
           (this.reach[key] || []).map((item) => ({ ...item, key, reason: this.gapReason(item, starts) })).filter((item) => item.reason);
-        return this.tasks
+        return this.tasksOf(picked)
           .map((task) => ({
             ...task,
             lines: lines(task.key),
@@ -1015,14 +1026,24 @@ <h2 x-text="t('release')"></h2>
           .map((link) => ({ url: link.url, label: link.iid != null ? "!" + link.iid : link.sha.slice(0, 8) }));
       },
       get neededPicks() {
+        const picks = { ...this.picks };
         const needed = new Map();
-        for (const task of this.gaps) {
-          for (const line of [...task.lines, ...task.deps.flatMap((dep) => dep.lines)]) {
-            const known = needed.get(line.project);
-            if (line.state === "tag" && (!known || line.tagIndex < known.tagIndex)) needed.set(line.project, line);
+        for (;;) {
+          const round = new Map();
+          for (const task of this.gapsOf(this.pickedFor(picks))) {
+            for (const line of [...task.lines, ...task.deps.flatMap((dep) => dep.lines)]) {
+              const known = round.get(line.project);
+              if (line.state === "tag" && picks[line.project] !== line.tag && (!known || line.tagIndex < known.tagIndex)) {
+                round.set(line.project, line);
+              }
+            }
+          }
+          if (!round.size) return [...needed.values()];
+          for (const line of round.values()) {
+            picks[line.project] = line.tag;
+            needed.set(line.project, line);
           }
         }
-        return [...needed.values()];
       },
       pickGap(line) {
         this.pick(this.serviceOf(line.project), line.tag);
@@ -1081,14 +1102,28 @@ <h2 x-text="t('release')"></h2>
           return `- ${item.service.project} ${item.candidate.tag.name}: ${compare} · ${build}`;
         });
         const tasks = this.tasks.map((task) => `- [${task.key}](${task.url})${task.issue ? " " + task.issue.summary : ""}`);
+        const gaps = this.gaps;
         return [
           this.t("postServices"),
           ...services,
           "",
           this.t("postTasks", { count: tasks.length }),
           ...(tasks.length ? tasks : [this.t("postNone")]),
+          ...(gaps.length ? ["", this.t("postGaps", { count: gaps.length }), ...gaps.flatMap((task) => this.postGap(task))] : []),
         ].join("\n");
       },
+      postGap(task) {
+        const line = (item, indent) =>
+          `${indent}- ${item.project}: ${[item.reason, ...this.gapChanges(item).map((change) => `[${change.label}](${change.url})`)].join(" ")}`;
+        return [
+          `- [${task.key}](${task.url})${task.issue ? " " + task.issue.summary : ""}`,
+          ...task.lines.map((item) => line(item, "  ")),
+          ...task.deps.flatMap((dep) => [
+            `  - ${this.relationLabel(dep.relation)} [${dep.key}](${dep.issue.url}) ${dep.issue.summary}${dep.lines.length ? "" : ": " + dep.issue.status}`,
+            ...dep.lines.map((item) => line(item, "    ")),
+          ]),
+        ];
+      },
       get compareMarkdown() {
         return this.picked
           .map((item) => `- ${item.service.project}: [${this.compareLabel(item)}](${item.candidate.compare_url})`)

tests/test_browser.py

@@ -417,6 +417,47 @@ def test_demo_picking_every_needed_tag_at_once(page: Page, demo_site: str, error
     assert errors == []
 
 
+def test_demo_picking_every_needed_tag_also_picks_what_those_tags_need(
+    page: Page, demo_site: str, errors: list[str]
+) -> None:
+    page.goto(demo_site)
+    _pick_by_hand(page, "shop/web", "1.9.0")
+
+    page.get_by_role("button", name="Pick 2 needed tags").click()
+
+    expect(_demo_service(page, "shop/api").locator(".chip > span")).to_have_text("2.5.0")
+    expect(_demo_service(page, "shop/worker").locator(".chip > span")).to_have_text("0.15.0")
+    expect(page.locator(".gaps > p button")).to_be_hidden()
+    assert errors == []
+
+
+def test_demo_release_post_lists_what_the_picks_leave_behind(page: Page, demo_site: str, errors: list[str]) -> None:
+    page.goto(demo_site)
+    _pick_by_hand(page, "shop/api", "2.5.0")
+    _pick_by_hand(page, "shop/web", "1.9.0")
+
+    page.get_by_role("button", name="Release post").click()
+
+    post: typing.Final = page.locator("section", has=page.get_by_role("button", name="Copy")).locator("textarea").last
+    expect(post).to_have_value(
+        re.compile(
+            re.escape(
+                "\n\n**Left behind (3)**\n"
+                "- [SHOP-38](https://jira.example.com/browse/SHOP-38) Export orders as CSV\n"
+                "  - partners/mobile: not in this report\n"
+                "  - is blocked by [SHOP-44](https://jira.example.com/browse/SHOP-44) Only managers may export orders\n"
+                "    - shop/admin: not merged [!15](https://gitlab.example.com/shop/admin/-/merge_requests/15)\n"
+                "    - legacy/admin: not in this report\n"
+                "- [SHOP-35]"
+            )
+        )
+    )
+    expect(post).to_have_value(
+        re.compile(r"  - is blocked by \[SHOP-45\]\(\S+\) Pick the dark palette with design: To Do\n")
+    )
+    assert errors == []
+
+
 def test_demo_tasks_name_the_changes_that_bring_them(page: Page, demo_site: str, errors: list[str]) -> None:
     page.goto(demo_site)