2 files changed, 265 insertions, 0 deletions

diff --git a/src/bin/ngit/sub_commands/issue_list.rs b/src/bin/ngit/sub_commands/issue_list.rs
new file mode 100644
index 0000000..6b31db2
--- /dev/null
+++ b/src/bin/ngit/sub_commands/issue_list.rs
@@ -0,0 +1,264 @@
+use std::collections::HashSet;
+
+use anyhow::{Context, Result, bail};
+use ngit::{
+    client::{Params, get_issues_from_cache},
+    git_events::{get_status, status_kinds, tag_value},
+};
+use nostr::{
+    FromBech32,
+    filter::{Alphabet, SingleLetterTag},
+    nips::nip19::Nip19,
+};
+use nostr_sdk::Kind;
+
+use crate::{
+    client::{Client, Connect, fetching_with_report, get_events_from_local_cache, get_repo_ref_from_cache},
+    git::{Repo, RepoActions},
+    repo_ref::get_repo_coordinates_when_remote_unknown,
+};
+
+fn get_issue_title(event: &nostr::Event) -> String {
+    tag_value(event, "subject")
+        .ok()
+        .filter(|s| !s.is_empty())
+        .unwrap_or_else(|| {
+            let first_line = event.content.lines().next().unwrap_or("").trim().to_string();
+            if first_line.is_empty() {
+                event.id.to_string()
+            } else {
+                first_line
+            }
+        })
+}
+
+fn get_issue_hashtags(event: &nostr::Event) -> Vec<String> {
+    event
+        .tags
+        .iter()
+        .filter(|t| {
+            let s = t.as_slice();
+            s.len() >= 2 && s[0].eq("t")
+        })
+        .map(|t| t.as_slice()[1].clone())
+        .collect()
+}
+
+fn status_kind_to_str(kind: Kind) -> &'static str {
+    match kind {
+        Kind::GitStatusOpen => "open",
+        Kind::GitStatusDraft => "draft",
+        Kind::GitStatusClosed => "closed",
+        Kind::GitStatusApplied => "applied",
+        _ => "unknown",
+    }
+}
+
+#[allow(clippy::too_many_lines)]
+pub async fn launch(
+    status: String,
+    hashtag: Option<String>,
+    json: bool,
+    id: Option<String>,
+    offline: bool,
+) -> Result<()> {
+    let git_repo = Repo::discover().context("failed to find a git repository")?;
+    let git_repo_path = git_repo.get_path()?;
+
+    let client = Client::new(Params::with_git_config_relay_defaults(&Some(&git_repo)));
+
+    let repo_coordinates = get_repo_coordinates_when_remote_unknown(&git_repo, &client).await?;
+
+    if !offline {
+        fetching_with_report(git_repo_path, &client, &repo_coordinates).await?;
+    }
+
+    let repo_ref = get_repo_ref_from_cache(Some(git_repo_path), &repo_coordinates).await?;
+
+    let issues: Vec<nostr::Event> =
+        get_issues_from_cache(git_repo_path, repo_ref.coordinates()).await?;
+
+    if issues.is_empty() {
+        println!("no issues found");
+        return Ok(());
+    }
+
+    let statuses: Vec<nostr::Event> = {
+        let mut statuses = get_events_from_local_cache(
+            git_repo_path,
+            vec![
+                nostr::Filter::default()
+                    .kinds(status_kinds().clone())
+                    .events(issues.iter().map(|e| e.id)),
+                nostr::Filter::default()
+                    .custom_tags(
+                        SingleLetterTag::uppercase(Alphabet::E),
+                        issues.iter().map(|e| e.id),
+                    )
+                    .kinds(status_kinds().clone()),
+            ],
+        )
+        .await?;
+        statuses.sort_by_key(|e| e.created_at);
+        statuses.reverse();
+        statuses
+    };
+
+    let status_filter: HashSet<&str> = status.split(',').map(str::trim).collect();
+
+    let hashtag_filter: Option<HashSet<String>> = hashtag.map(|h| {
+        h.split(',')
+            .map(|s| s.trim().to_lowercase())
+            .collect::<HashSet<String>>()
+    });
+
+    // Use an empty vec as the "all_pr_roots" argument — issues don't have PR
+    // revisions, so we pass an empty slice.
+    let empty_proposals: Vec<nostr::Event> = vec![];
+
+    let filtered: Vec<(&nostr::Event, Kind, Vec<String>)> = issues
+        .iter()
+        .filter_map(|issue| {
+            let status_kind = get_status(issue, &repo_ref, &statuses, &empty_proposals);
+            let status_str = status_kind_to_str(status_kind);
+            if !status_filter.contains(status_str) && !status_filter.contains("unknown") {
+                return None;
+            }
+            let tags = get_issue_hashtags(issue);
+            if let Some(ref hf) = hashtag_filter {
+                let issue_tags_lower: HashSet<String> =
+                    tags.iter().map(|t| t.to_lowercase()).collect();
+                if !hf.iter().any(|h| issue_tags_lower.contains(h)) {
+                    return None;
+                }
+            }
+            Some((issue, status_kind, tags))
+        })
+        .collect();
+
+    if filtered.is_empty() {
+        println!("no issues found matching the given filters");
+        return Ok(());
+    }
+
+    if let Some(ref event_id_or_nevent) = id {
+        return show_issue_details(&filtered, event_id_or_nevent, json);
+    }
+
+    if json {
+        output_json(&filtered)?;
+    } else {
+        output_table(&filtered, &status, hashtag_filter.as_ref());
+    }
+
+    Ok(())
+}
+
+fn show_issue_details(
+    issues: &[(&nostr::Event, Kind, Vec<String>)],
+    event_id_or_nevent: &str,
+    json: bool,
+) -> Result<()> {
+    let target_id = if event_id_or_nevent.starts_with("nevent") {
+        let nip19 = Nip19::from_bech32(event_id_or_nevent).context("failed to parse nevent")?;
+        match nip19 {
+            Nip19::EventId(id) => id,
+            Nip19::Event(event) => event.event_id,
+            _ => bail!("invalid nevent format"),
+        }
+    } else {
+        nostr::EventId::from_hex(event_id_or_nevent).context("failed to parse event id")?
+    };
+
+    let (issue, status_kind, tags) = issues
+        .iter()
+        .find(|(e, _, _)| e.id == target_id)
+        .context("issue not found")?;
+
+    let title = get_issue_title(issue);
+    let status = status_kind_to_str(*status_kind);
+
+    if json {
+        use nostr::ToBech32;
+        let json_output = serde_json::json!({
+            "id": issue.id.to_string(),
+            "status": status,
+            "title": title,
+            "author": issue.pubkey.to_bech32().unwrap_or_default(),
+            "hashtags": tags,
+            "description": issue.content,
+        });
+        println!("{}", serde_json::to_string_pretty(&json_output)?);
+        return Ok(());
+    }
+
+    println!("Title:  {title}");
+    use nostr::ToBech32;
+    println!("Author: {}", issue.pubkey.to_bech32().unwrap_or_default());
+    println!("Status: {status}");
+    if !tags.is_empty() {
+        let tags_str = tags.iter().map(|t| format!("#{t}")).collect::<Vec<_>>().join(" ");
+        println!("Tags:   {tags_str}");
+    }
+
+    if !issue.content.is_empty() {
+        println!();
+        for line in issue.content.lines() {
+            println!("  {line}");
+        }
+    }
+
+    Ok(())
+}
+
+fn output_table(
+    issues: &[(&nostr::Event, Kind, Vec<String>)],
+    status_filter: &str,
+    hashtag_filter: Option<&HashSet<String>>,
+) {
+    println!("{:<66} {:<8} TITLE  HASHTAGS", "ID", "STATUS");
+    for (issue, status_kind, tags) in issues {
+        let id = issue.id.to_string();
+        let status = status_kind_to_str(*status_kind);
+        let title = get_issue_title(issue);
+        let tags_str = if tags.is_empty() {
+            String::new()
+        } else {
+            tags.iter()
+                .map(|t| format!("#{t}"))
+                .collect::<Vec<_>>()
+                .join(" ")
+        };
+        if tags_str.is_empty() {
+            println!("{id:<66} {status:<8} {title}");
+        } else {
+            println!("{id:<66} {status:<8} {title}  {tags_str}");
+        }
+    }
+
+    println!();
+    print!("--status {status_filter}");
+    if let Some(hf) = hashtag_filter {
+        let tags: Vec<&String> = hf.iter().collect();
+        print!("  --hashtag {}", tags.iter().map(|s| s.as_str()).collect::<Vec<_>>().join(","));
+    }
+    println!();
+}
+
+fn output_json(issues: &[(&nostr::Event, Kind, Vec<String>)]) -> Result<()> {
+    use nostr::ToBech32;
+    let json_output: Vec<serde_json::Value> = issues
+        .iter()
+        .map(|(issue, status_kind, tags)| {
+            serde_json::json!({
+                "id": issue.id.to_string(),
+                "status": status_kind_to_str(*status_kind),
+                "title": get_issue_title(issue),
+                "author": issue.pubkey.to_bech32().unwrap_or_default(),
+                "hashtags": tags,
+            })
+        })
+        .collect();
+    println!("{}", serde_json::to_string_pretty(&json_output)?);
+    Ok(())
+}
diff --git a/src/bin/ngit/sub_commands/mod.rs b/src/bin/ngit/sub_commands/mod.rs
index d132240..d864391 100644
--- a/src/bin/ngit/sub_commands/mod.rs
+++ b/src/bin/ngit/sub_commands/mod.rs
@@ -3,6 +3,7 @@ pub mod checkout;
 pub mod create;
 pub mod export_keys;
 pub mod init;
+pub mod issue_list;
 pub mod list;
 pub mod login;
 pub mod logout;