initial commit

lib/nostr/snippets.ts

@@ -0,0 +1,136 @@
+import type { NDKEvent, NDKFilter } from "@nostr-dev-kit/ndk";
+import { ndk } from "../../ndk.js";
+import { knownUsers } from "../../users.js";
+import type { CodeSnippet, FindSnippetsParams } from "../types/index.js";
+import { log } from "../utils/log.js";
+import { SNIPPET_KIND, eventToSnippet, identifierToPubkeys } from "./utils.js";
+
+/**
+ * Get code snippets from Nostr events of kind 1337
+ *
+ * @param params - Parameters to filter snippets
+ * @returns Array of code snippets
+ */
+export async function getSnippets(params: FindSnippetsParams = {}): Promise<{
+    snippets: CodeSnippet[];
+    otherSnippets: CodeSnippet[];
+}> {
+    // Construct filter based on params
+    const filter: NDKFilter = {
+        kinds: [SNIPPET_KIND as number],
+        limit: params.limit || 500,
+    };
+
+    // Add optional filters
+    if (params.since) {
+        filter.since = params.since;
+    }
+
+    if (params.until) {
+        filter.until = params.until;
+    }
+
+    if (params.authors && params.authors.length > 0) {
+        for (const author of params.authors) {
+            const pubkeys = identifierToPubkeys(author);
+            if (pubkeys.length) {
+                filter.authors ??= [];
+                filter.authors.push(...pubkeys);
+            } else {
+                log(`Unknown author: ${author}`);
+            }
+        }
+    }
+
+    // Add custom tag filters for languages and tags
+    if (params.languages && params.languages.length > 0) {
+        filter["#l"] = params.languages;
+    }
+
+    if (params.tags && params.tags.length > 0) {
+        filter["#t"] = params.tags;
+    }
+
+    log(`Fetching snippets with filter: ${JSON.stringify(filter, null, 2)}`);
+
+    // Fetch events
+    const events = await ndk.fetchEvents(filter);
+
+    let maxMatchCount = 0;
+
+    function getMatchCount(event: NDKEvent) {
+        if (!params.tags || params.tags.length === 0) return 1;
+
+        const aTags = event.tags
+            .filter((tag) => tag[0] === "t")
+            .map((tag) => tag[1])
+            .filter((t) => t !== undefined);
+        return params.tags.filter((tag) =>
+            aTags.some((t) => t.match(new RegExp(tag, "i")))
+        ).length;
+    }
+
+    for (const event of events) {
+        const aMatches = getMatchCount(event);
+        if (aMatches > maxMatchCount) maxMatchCount = aMatches;
+    }
+
+    const selectedEvents: NDKEvent[] = [];
+    const notSelectedEvents: NDKEvent[] = [];
+
+    for (const event of events) {
+        if (getMatchCount(event) === maxMatchCount) {
+            selectedEvents.push(event);
+        } else {
+            notSelectedEvents.push(event);
+        }
+    }
+
+    // Convert events to snippets
+    const snippets = selectedEvents.map(eventToSnippet);
+    const otherSnippets = notSelectedEvents.map(eventToSnippet);
+
+    return { snippets, otherSnippets };
+}
+
+/**
+ * Format snippets for display
+ * @param snippets Array of code snippets
+ * @returns Formatted string representation
+ */
+export function formatSnippets(snippets: CodeSnippet[]): string {
+    return snippets
+        .map((snippet) => {
+            const author = knownUsers[snippet.pubkey];
+            const keys: Record<string, string> = {
+                Title: snippet.title,
+                Language: snippet.language,
+                Tags: snippet.tags.join(", "),
+                Code: snippet.code,
+            };
+            if (author?.profile?.name) keys.Author = author.profile.name;
+            return Object.entries(keys)
+                .map(([key, value]) => `${key}: ${value}`)
+                .join("\n");
+        })
+        .join("\n\n---\n\n");
+}
+
+/**
+ * Format partial match snippets for display
+ * @param snippets Array of code snippets
+ * @returns Formatted string representation
+ */
+export function formatPartialMatches(snippets: CodeSnippet[]): string {
+    if (snippets.length === 0) return "";
+
+    let text =
+        "\n\nSome other events not included in this result since they had less in common with your search, here is a list of the events that had partial matches:\n\n";
+    text += snippets
+        .map((snippet) => {
+            return ` * ${snippet.title}:\n   Tags: ${snippet.tags.join(", ")}`;
+        })
+        .join("\n");
+
+    return text;
+}