Split conflict detection out of plugin.ts and the CI/CD section out of the README

src/plugin-host/conflicts.ts

@@ -0,0 +1,104 @@
+// Cross-plugin conflict detection over the discovered set; discovery throws on any "error" and logs
+// every "warn". The per-plugin rules live in plugin.ts.
+
+import type { NavNode } from "../ui/nav.ts";
+import { declaredPermissions, fullPath, type Plugin } from "./plugin.ts";
+import { envName } from "./settings.ts";
+
+export interface PluginConflict {
+  kind: "dashboard" | "home" | "id" | "nav-id" | "permission" | "route" | "setting";
+  level: "error" | "warn";
+  message: string;
+  plugins: string[]; // unique ids involved
+}
+
+// Loud resolution, never last-write-wins: discovery throws on any "error" and logs every "warn".
+// Mount-path uniqueness needs no rule of its own — it follows from the id check. Shared permission
+// names are the one intentional overlap, so they warn rather than error.
+export function findConflicts(plugins: Plugin[]): PluginConflict[] {
+  const out: PluginConflict[] = [];
+
+  const idCounts = new Map<string, number>();
+  for (const plugin of plugins) idCounts.set(plugin.id, (idCounts.get(plugin.id) ?? 0) + 1);
+  for (const [id, n] of idCounts) {
+    if (n > 1) out.push({ kind: "id", level: "error", message: `${n} plugins share id "${id}"; ids must be globally unique`, plugins: [id] });
+  }
+
+  // The landing pages are single slots: "/" (home) and "/dashboard" (dashboard) take one owner
+  // each — two plugins claiming either is a loud error, not a race.
+  for (const slot of ["home", "dashboard"] as const) {
+    const owners = plugins.filter((plugin) => plugin[slot]).map((plugin) => plugin.id);
+    if (owners.length > 1) out.push({ kind: slot, level: "error", message: `${owners.length} plugins claim "${slot}" (${owners.join(", ")}); only one may own that page`, plugins: uniq(owners) });
+  }
+
+  collect(plugins, (plugin, push) => {
+    for (const route of plugin.routes ?? []) push(`${route.method} ${fullPath(plugin.id, route.path)}`);
+  }).forEach((owners, key) => {
+    if (owners.length > 1) out.push({ kind: "route", level: "error", message: `${owners.length} routes resolve to "${key}"`, plugins: uniq(owners) });
+  });
+
+  collect(plugins, (plugin, push) => collectNavIds(plugin.nav, push)).forEach((owners, id) => {
+    if (owners.length > 1) out.push({ kind: "nav-id", level: "error", message: `nav id "${id}" used ${owners.length}×; override targets ids, so they must be unique`, plugins: uniq(owners) });
+  });
+
+  collect(plugins, (plugin, push) => {
+    for (const decl of plugin.permissions ?? []) push(decl.name);
+  }).forEach((owners, name) => {
+    if (owners.length > 1) out.push({ kind: "permission", level: "warn", message: `permission "${name}" declared by ${uniq(owners).length} plugins; pick a more specific "<resource>" unless shared on purpose`, plugins: uniq(owners) });
+  });
+
+  out.push(...undeclaredGates(plugins));
+
+  // Both the id's dashes and the key's camel humps become underscores, so plugin "a-b" key "c" and
+  // plugin "a" key "bC" name one variable — one plugin would silently read the other's value.
+  collect(plugins, (plugin, push) => {
+    for (const decl of plugin.settings ?? []) push(envName(plugin.id, decl.key));
+  }).forEach((owners, name) => {
+    if (owners.length > 1) out.push({ kind: "setting", level: "error", message: `${owners.length} settings resolve to "${name}"; rename a key or a plugin folder`, plugins: uniq(owners) });
+  });
+
+  return out;
+}
+
+// Declaring is optional, but the admin screens offer only declared names: a route gated on one nobody
+// declares answers 403 (a nav node is hidden) until the Keto tuple is written by hand or
+// ADMIN_PERMISSIONS seeds it.
+function undeclaredGates(plugins: Plugin[]): PluginConflict[] {
+  const declared = new Set(declaredPermissions(plugins).map((decl) => decl.name));
+  const out: PluginConflict[] = [];
+  for (const plugin of plugins) {
+    const gated = new Set<string>();
+    for (const route of plugin.routes ?? []) if (route.permission != null) gated.add(route.permission);
+    collectNavPermissions(plugin.nav, (name) => gated.add(name));
+    for (const entry of plugin.profileMenu ?? []) if (entry.permission != null) gated.add(entry.permission);
+    for (const name of [...gated].sort()) {
+      if (!declared.has(name)) out.push({ kind: "permission", level: "warn", message: `plugin "${plugin.id}" gates on "${name}", which no installed plugin declares, so the admin screens can't grant it; declare it in that plugin's \`permissions\``, plugins: [plugin.id] });
+    }
+  }
+  return out;
+}
+
+function collectNavPermissions(nodes: NavNode[] | undefined, push: (name: string) => void): void {
+  for (const node of nodes ?? []) {
+    if (node.permission != null) push(node.permission);
+    collectNavPermissions(node.children, push);
+  }
+}
+
+// Map each emitted key → the plugin ids that emitted it (repeats kept, so within-plugin dups count).
+function collect(plugins: Plugin[], emit: (plugin: Plugin, push: (key: string) => void) => void): Map<string, string[]> {
+  const owners = new Map<string, string[]>();
+  for (const plugin of plugins) emit(plugin, (key) => owners.set(key, [...(owners.get(key) ?? []), plugin.id]));
+  return owners;
+}
+
+function collectNavIds(nodes: NavNode[] | undefined, push: (id: string) => void): void {
+  for (const node of nodes ?? []) {
+    if (node.id != null) push(node.id);
+    collectNavIds(node.children, push);
+  }
+}
+
+function uniq(xs: string[]): string[] {
+  return [...new Set(xs)];
+}