2 files changed, 311 insertions, 0 deletions

diff --git a/src/lib/mod.rs b/src/lib/mod.rs
index 076c2d2..265dd6b 100644
--- a/src/lib/mod.rs
+++ b/src/lib/mod.rs
@@ -4,6 +4,7 @@ pub mod git;
 pub mod git_events;
 pub mod list;
 pub mod login;
+pub mod push;
 pub mod repo_ref;
 pub mod repo_state;
 pub mod utils;
diff --git a/src/lib/push.rs b/src/lib/push.rs
new file mode 100644
index 0000000..0d0ec93
--- /dev/null
+++ b/src/lib/push.rs
@@ -0,0 +1,310 @@
+use std::{
+    sync::{Arc, Mutex},
+    time::Instant,
+};
+
+use anyhow::{Result, anyhow};
+use auth_git2::GitAuthenticator;
+use console::Term;
+
+use crate::{
+    cli_interactor::count_lines_per_msg_vec,
+    git::{
+        Repo,
+        nostr_url::{CloneUrl, NostrUrlDecoded},
+        oid_to_shorthand_string,
+    },
+    utils::{
+        Direction, get_short_git_server_name, get_write_protocols_to_try, join_with_and,
+        set_protocol_preference,
+    },
+};
+
+pub fn push_to_remote(
+    git_repo: &Repo,
+    git_server_url: &str,
+    decoded_nostr_url: &NostrUrlDecoded,
+    remote_refspecs: &[String],
+    term: &Term,
+    is_grasp_server: bool,
+) -> Result<()> {
+    let server_url = git_server_url.parse::<CloneUrl>()?;
+    let protocols_to_attempt =
+        get_write_protocols_to_try(git_repo, &server_url, decoded_nostr_url, is_grasp_server);
+
+    let mut failed_protocols = vec![];
+    let mut success = false;
+
+    for protocol in &protocols_to_attempt {
+        term.write_line(format!("push: {} over {protocol}...", server_url.short_name(),).as_str())?;
+
+        let formatted_url = server_url.format_as(protocol, &decoded_nostr_url.user)?;
+
+        if let Err(error) = push_to_remote_url(git_repo, &formatted_url, remote_refspecs, term) {
+            term.write_line(
+                format!("push: {formatted_url} failed over {protocol}: {error}").as_str(),
+            )?;
+            failed_protocols.push(protocol);
+        } else {
+            success = true;
+            if !failed_protocols.is_empty() {
+                term.write_line(format!("push: succeeded over {protocol}").as_str())?;
+                let _ = set_protocol_preference(git_repo, protocol, &server_url, &Direction::Push);
+            }
+            break;
+        }
+    }
+    if success {
+        Ok(())
+    } else {
+        let error = anyhow!(
+            "{} failed over {}{}",
+            server_url.short_name(),
+            join_with_and(&failed_protocols),
+            if decoded_nostr_url.protocol.is_some() {
+                " and nostr url contains protocol override so no other protocols were attempted"
+            } else {
+                ""
+            },
+        );
+        term.write_line(format!("push: {error}").as_str())?;
+        Err(error)
+    }
+}
+
+pub fn push_to_remote_url(
+    git_repo: &Repo,
+    git_server_url: &str,
+    remote_refspecs: &[String],
+    term: &Term,
+) -> Result<()> {
+    let git_config = git_repo.git_repo.config()?;
+    let mut git_server_remote = git_repo.git_repo.remote_anonymous(git_server_url)?;
+    let auth = GitAuthenticator::default();
+    let mut push_options = git2::PushOptions::new();
+    let mut remote_callbacks = git2::RemoteCallbacks::new();
+    let push_reporter = Arc::new(Mutex::new(PushReporter::new(term)));
+
+    remote_callbacks.credentials(auth.credentials(&git_config));
+
+    remote_callbacks.push_update_reference({
+        let push_reporter = Arc::clone(&push_reporter);
+        move |name, error| {
+            let mut reporter = push_reporter.lock().unwrap();
+            if let Some(error) = error {
+                let existing_lines = reporter.count_all_existing_lines();
+                reporter.update_reference_errors.push(format!(
+                    "WARNING: {} failed to push {name} error: {error}",
+                    get_short_git_server_name(git_repo, git_server_url),
+                ));
+                reporter.write_all(existing_lines);
+            }
+            Ok(())
+        }
+    });
+
+    remote_callbacks.push_negotiation({
+        let push_reporter = Arc::clone(&push_reporter);
+        move |updates| {
+            let mut reporter = push_reporter.lock().unwrap();
+            let existing_lines = reporter.count_all_existing_lines();
+
+            for update in updates {
+                let dst_refname = update
+                    .dst_refname()
+                    .unwrap_or("")
+                    .replace("refs/heads/", "")
+                    .replace("refs/tags/", "tags/");
+                let msg = if update.dst().is_zero() {
+                    format!("push: - [delete]          {dst_refname}")
+                } else if update.src().is_zero() {
+                    if update.dst_refname().unwrap_or("").contains("refs/tags") {
+                        format!("push: * [new tag]         {dst_refname}")
+                    } else {
+                        format!("push: * [new branch]      {dst_refname}")
+                    }
+                } else {
+                    let force = remote_refspecs
+                        .iter()
+                        .any(|r| r.contains(&dst_refname) && r.contains('+'));
+                    format!(
+                        "push: {} {}..{}  {} -> {dst_refname}",
+                        if force { "+" } else { " " },
+                        oid_to_shorthand_string(update.src()).unwrap(),
+                        oid_to_shorthand_string(update.dst()).unwrap(),
+                        update
+                            .src_refname()
+                            .unwrap_or("")
+                            .replace("refs/heads/", "")
+                            .replace("refs/tags/", "tags/"),
+                    )
+                };
+                // other possibilities will result in push to fail but better reporting is
+                // needed:
+                // deleting a non-existant branch:
+                // ! [remote rejected] <old-branch-name> -> <old-branch-name> (not found)
+                // adding a branch that already exists:
+                // ! [remote rejected] <new-branch-name> -> <new-branch-name> (already exists)
+                // pushing without non-fast-forward without force:
+                // ! [rejected]        <branch-name> -> <branch-name> (non-fast-forward)
+                reporter.negotiation.push(msg);
+            }
+            reporter.write_all(existing_lines);
+            Ok(())
+        }
+    });
+
+    remote_callbacks.push_transfer_progress({
+        let push_reporter = Arc::clone(&push_reporter);
+        #[allow(clippy::cast_precision_loss)]
+        move |current, total, bytes| {
+            let mut reporter = push_reporter.lock().unwrap();
+            reporter.process_transfer_progress_update(current, total, bytes);
+        }
+    });
+
+    remote_callbacks.sideband_progress({
+        let push_reporter = Arc::clone(&push_reporter);
+        move |data| {
+            let mut reporter = push_reporter.lock().unwrap();
+            reporter.process_remote_msg(data);
+            true
+        }
+    });
+    push_options.remote_callbacks(remote_callbacks);
+    git_server_remote.push(remote_refspecs, Some(&mut push_options))?;
+    let _ = git_server_remote.disconnect();
+    Ok(())
+}
+
+#[allow(clippy::cast_precision_loss)]
+#[allow(clippy::float_cmp)]
+#[allow(clippy::needless_pass_by_value)]
+fn report_on_transfer_progress(
+    current: usize,
+    total: usize,
+    bytes: usize,
+    start_time: &Instant,
+    end_time: Option<&Instant>,
+) -> Option<String> {
+    if total == 0 {
+        return None;
+    }
+    let percentage = ((current as f64 / total as f64) * 100.0)
+        // always round down because 100% complete is misleading when its not complete
+        .floor();
+    let (size, unit) = if bytes as f64 >= (1024.0 * 1024.0) {
+        (bytes as f64 / (1024.0 * 1024.0), "MiB")
+    } else {
+        (bytes as f64 / 1024.0, "KiB")
+    };
+    let speed = {
+        let duration = if let Some(end_time) = end_time {
+            (*end_time - *start_time).as_millis() as f64
+        } else {
+            start_time.elapsed().as_millis() as f64
+        };
+
+        if duration > 0.0 {
+            (bytes as f64 / (1024.0 * 1024.0)) / (duration / 1000.0) // Convert bytes to MiB and milliseconds to seconds
+        } else {
+            0.0
+        }
+    };
+
+    Some(format!(
+        "push: Writing objects: {percentage}% ({current}/{total}) {size:.2} {unit}  | {speed:.2} MiB/s{}",
+        if current == total { ", done." } else { "" },
+    ))
+}
+
+pub struct PushReporter<'a> {
+    remote_msgs: Vec<String>,
+    negotiation: Vec<String>,
+    transfer_progress_msgs: Vec<String>,
+    update_reference_errors: Vec<String>,
+    term: &'a console::Term,
+    start_time: Option<Instant>,
+    end_time: Option<Instant>,
+}
+impl<'a> PushReporter<'a> {
+    fn new(term: &'a console::Term) -> Self {
+        Self {
+            remote_msgs: vec![],
+            negotiation: vec![],
+            transfer_progress_msgs: vec![],
+            update_reference_errors: vec![],
+            term,
+            start_time: None,
+            end_time: None,
+        }
+    }
+    fn write_all(&self, lines_to_clear: usize) {
+        let _ = self.term.clear_last_lines(lines_to_clear);
+        for msg in &self.remote_msgs {
+            let _ = self.term.write_line(format!("remote: {msg}").as_str());
+        }
+        for msg in &self.negotiation {
+            let _ = self.term.write_line(msg);
+        }
+        for msg in &self.transfer_progress_msgs {
+            let _ = self.term.write_line(msg);
+        }
+        for msg in &self.update_reference_errors {
+            let _ = self.term.write_line(msg);
+        }
+    }
+
+    fn count_all_existing_lines(&self) -> usize {
+        let width = self.term.size().1;
+        count_lines_per_msg_vec(width, &self.remote_msgs, "remote: ".len())
+            + count_lines_per_msg_vec(width, &self.negotiation, 0)
+            + count_lines_per_msg_vec(width, &self.transfer_progress_msgs, 0)
+            + count_lines_per_msg_vec(width, &self.update_reference_errors, 0)
+    }
+    fn process_remote_msg(&mut self, data: &[u8]) {
+        if let Ok(data) = str::from_utf8(data) {
+            let data = data
+                .split(['\n', '\r'])
+                .map(str::trim)
+                .filter(|line| !line.trim().is_empty())
+                .collect::<Vec<&str>>();
+            for data in data {
+                let existing_lines = self.count_all_existing_lines();
+                let msg = data.to_string();
+                if let Some(last) = self.remote_msgs.last() {
+                    if (last.contains('%') && !last.contains("100%"))
+                        || last == &msg.replace(", done.", "")
+                    {
+                        self.remote_msgs.pop();
+                        self.remote_msgs.push(msg);
+                    } else {
+                        self.remote_msgs.push(msg);
+                    }
+                } else {
+                    self.remote_msgs.push(msg);
+                }
+                self.write_all(existing_lines);
+            }
+        }
+    }
+    fn process_transfer_progress_update(&mut self, current: usize, total: usize, bytes: usize) {
+        if self.start_time.is_none() {
+            self.start_time = Some(Instant::now());
+        }
+        if let Some(report) = report_on_transfer_progress(
+            current,
+            total,
+            bytes,
+            &self.start_time.unwrap(),
+            self.end_time.as_ref(),
+        ) {
+            let existing_lines = self.count_all_existing_lines();
+            if report.contains("100%") {
+                self.end_time = Some(Instant::now());
+            }
+            self.transfer_progress_msgs = vec![report];
+            self.write_all(existing_lines);
+        }
+    }
+}