feat: Setup the CLI and create repo view command

Signed-off-by: Awiteb <a@4rs.nl>

src/nostr_utils/mod.rs

@@ -0,0 +1,104 @@
+// n34 - A CLI to interact with NIP-34 and other stuff related to codes in nostr
+// Copyright (C) 2025 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://gnu.org/licenses/gpl-3.0.html>.
+
+pub mod utils;
+
+use std::time::Duration;
+
+use nostr::{
+    event::Kind,
+    filter::Filter,
+    key::Keys,
+    nips::{nip19::Nip19Coordinate, nip34::GitRepositoryAnnouncement},
+    types::RelayUrl,
+};
+use nostr_sdk::Client;
+
+use crate::{
+    cli::CliOptions,
+    error::{N34Error, N34Result},
+};
+
+/// A client for interacting with the Nostr relays
+pub struct NostrClient {
+    /// The underlying Nostr client implementation
+    client: Client,
+}
+
+impl NostrClient {
+    /// Creates a new [`NostrClient`] with the given client and options.
+    const fn new(client: Client) -> Self {
+        Self { client }
+    }
+
+    /// Initializes a new [`NostrClient`] instance and connects to the specified
+    /// relays.
+    pub async fn init(options: &CliOptions) -> Self {
+        let client = Self::new(
+            Client::builder()
+                .signer(Keys::new(
+                    options
+                        .secret_key
+                        .as_ref()
+                        .expect("This the only method for now")
+                        .clone(),
+                ))
+                .build(),
+        );
+
+        client.add_read_relays(&options.relays).await;
+        client
+    }
+
+    /// Add read relays and connect to them
+    pub async fn add_read_relays(&self, relays: &[RelayUrl]) {
+        for relay in relays {
+            self.client
+                .add_read_relay(relay)
+                .await
+                .expect("It's a valid relay url");
+            if let Err(err) = self
+                .client
+                .try_connect_relay(relay, Duration::from_millis(1500))
+                .await
+            {
+                tracing::error!("Failed to connect to relay '{relay}': {err}");
+            }
+        }
+    }
+
+    /// Try to fetch a repository and returns it
+    pub async fn fetch_repo(
+        &self,
+        repo_naddr: &Nip19Coordinate,
+    ) -> N34Result<GitRepositoryAnnouncement> {
+        let filter = Filter::new()
+            .author(repo_naddr.public_key)
+            .kind(Kind::GitRepoAnnouncement)
+            .identifier(&repo_naddr.identifier);
+        let events = self
+            .client
+            .fetch_events(filter, Duration::from_secs(1))
+            .await
+            .map_err(|_| N34Error::NotFoundRepo)?;
+
+
+        Ok(utils::event_into_repo(
+            events.first_owned().ok_or(N34Error::NotFoundRepo)?,
+            &repo_naddr.identifier,
+        ))
+    }
+}

src/nostr_utils/utils.rs

@@ -0,0 +1,80 @@
+// n34 - A CLI to interact with NIP-34 and other stuff related to codes in nostr
+// Copyright (C) 2025 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://gnu.org/licenses/gpl-3.0.html>.
+
+use std::{fmt, str::FromStr};
+
+use nostr::{
+    event::{Event, TagKind, TagStandard},
+    nips::nip34::GitRepositoryAnnouncement,
+};
+
+/// Returns the value of the given tag
+fn tag_value(tag: &TagStandard) -> String {
+    tag.clone().to_vec().remove(1)
+}
+
+/// Gets all values from the tag. If any value fails to parse, returns an empty
+/// vector.
+fn tag_values<T>(tag: &TagStandard) -> Vec<T>
+where
+    T: FromStr + fmt::Debug,
+    <T as FromStr>::Err: fmt::Debug,
+{
+    tag.clone()
+        .to_vec()
+        .into_iter()
+        .skip(1)
+        .map(|t| {
+            let result = T::from_str(t.as_str());
+            tracing::trace!("Parsing `{t}` result: `{result:?}`");
+            result
+        })
+        .collect::<Result<_, _>>()
+        .unwrap_or_default()
+}
+
+/// Convert [`Event`] to [`GitRepositoryAnnouncement`]
+pub fn event_into_repo(event: Event, repo_id: impl Into<String>) -> GitRepositoryAnnouncement {
+    GitRepositoryAnnouncement {
+        id:          repo_id.into(),
+        name:        event.tags.find_standardized(TagKind::Name).map(tag_value),
+        description: event
+            .tags
+            .find_standardized(TagKind::Description)
+            .map(tag_value),
+        web:         event
+            .tags
+            .find_standardized(TagKind::Web)
+            .map(tag_values)
+            .unwrap_or_default(),
+        clone:       event
+            .tags
+            .find_standardized(TagKind::Clone)
+            .map(tag_values)
+            .unwrap_or_default(),
+        relays:      event
+            .tags
+            .find_standardized(TagKind::Relays)
+            .map(tag_values)
+            .unwrap_or_default(),
+        euc:         None,
+        maintainers: event
+            .tags
+            .find_standardized(TagKind::Maintainers)
+            .map(tag_values)
+            .unwrap_or_default(),
+    }
+}