mobux 0.1.0

A touch-friendly tmux web UI for unhinged people who run terminal sessions from their phone while walking the dog
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use anyhow::{anyhow, Context, Result};
use serde::Serialize;
use tokio::process::Command;

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Session {
    pub name: String,
    pub windows: i32,
    pub attached: i32,
    pub created_unix: i64,
}

pub async fn list_sessions() -> Result<Vec<Session>> {
    let output = Command::new("tmux")
        .args([
            "list-sessions",
            "-F",
            "#{session_name}\t#{session_windows}\t#{session_attached}\t#{session_created}",
        ])
        .output()
        .await
        .context("failed to execute tmux")?;

    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        // Common case when no tmux server is running yet.
        if msg.contains("failed to connect to server") || msg.contains("no server running") {
            return Ok(vec![]);
        }
        return Err(anyhow!("tmux list-sessions failed: {}", msg));
    }

    let stdout = String::from_utf8_lossy(&output.stdout);
    let mut out = vec![];
    for line in stdout.lines() {
        let parts: Vec<&str> = line.split('\t').collect();
        if parts.len() != 4 {
            continue;
        }
        out.push(Session {
            name: parts[0].to_string(),
            windows: parts[1].parse().unwrap_or(0),
            attached: parts[2].parse().unwrap_or(0),
            created_unix: parts[3].parse().unwrap_or(0),
        });
    }
    out.sort_by(|a, b| a.name.cmp(&b.name));
    Ok(out)
}

pub async fn new_session(name: &str) -> Result<()> {
    let output = Command::new("tmux")
        .args(["new-session", "-d", "-s", name])
        .output()
        .await
        .context("failed to execute tmux")?;
    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        return Err(anyhow!("tmux new-session failed: {}", msg));
    }
    Ok(())
}

pub async fn kill_session(name: &str) -> Result<()> {
    let output = Command::new("tmux")
        .args(["kill-session", "-t", name])
        .output()
        .await
        .context("failed to execute tmux")?;
    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        return Err(anyhow!("tmux kill-session failed: {}", msg));
    }
    Ok(())
}

#[derive(Debug, Clone, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct Pane {
    pub index: String,
    pub title: String,
    pub active: bool,
}

pub async fn list_panes(session: &str) -> Result<Vec<Pane>> {
    // List windows (the main navigable units in tmux)
    let output = Command::new("tmux")
        .args([
            "list-windows",
            "-t", session,
            "-F",
            "#{window_index}\t#{window_name}\t#{window_active}",
        ])
        .output()
        .await
        .context("failed to execute tmux")?;

    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        return Err(anyhow!("tmux list-windows failed: {}", msg));
    }

    let stdout = String::from_utf8_lossy(&output.stdout);
    let mut out = vec![];
    for line in stdout.lines() {
        let parts: Vec<&str> = line.split('\t').collect();
        if parts.len() != 3 {
            continue;
        }
        out.push(Pane {
            index: parts[0].to_string(),
            title: parts[1].to_string(),
            active: parts[2] == "1",
        });
    }
    Ok(out)
}

pub async fn select_pane(session: &str, window_index: &str) -> Result<()> {
    let target = format!("{}:{}", session, window_index);
    let output = Command::new("tmux")
        .args(["select-window", "-t", &target])
        .output()
        .await
        .context("failed to execute tmux")?;
    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        return Err(anyhow!("tmux select-window failed: {}", msg));
    }
    Ok(())
}

pub async fn send_line(session: &str, text: &str) -> Result<()> {
    let set = Command::new("tmux")
        .args(["set-buffer", "--", text])
        .output()
        .await
        .context("failed to execute tmux set-buffer")?;
    if !set.status.success() {
        let msg = String::from_utf8_lossy(&set.stderr).trim().to_string();
        return Err(anyhow!("tmux set-buffer failed: {}", msg));
    }

    let paste = Command::new("tmux")
        .args(["paste-buffer", "-t", session])
        .output()
        .await
        .context("failed to execute tmux paste-buffer")?;
    if !paste.status.success() {
        let msg = String::from_utf8_lossy(&paste.stderr).trim().to_string();
        return Err(anyhow!("tmux paste-buffer failed: {}", msg));
    }

    let enter = Command::new("tmux")
        .args(["send-keys", "-t", session, "Enter"])
        .output()
        .await
        .context("failed to execute tmux send-keys")?;
    if !enter.status.success() {
        let msg = String::from_utf8_lossy(&enter.stderr).trim().to_string();
        return Err(anyhow!("tmux send-keys failed: {}", msg));
    }

    Ok(())
}

/// Execute a named tmux command on the active window/pane of a session.
pub async fn run_command(session: &str, command: &str) -> Result<String> {
    let next_pane = format!("{}:.+", session);
    let prev_pane = format!("{}:.-", session);
    let args: Vec<&str> = match command {
        "new-window" => vec!["new-window", "-t", session],
        "kill-window" => vec!["kill-window", "-t", session],
        "split-h" => vec!["split-window", "-h", "-t", session],
        "split-v" => vec!["split-window", "-v", "-t", session],
        "next-window" => vec!["next-window", "-t", session],
        "prev-window" => vec!["previous-window", "-t", session],
        "next-pane" => vec!["select-pane", "-t", &next_pane],
        "prev-pane" => vec!["select-pane", "-t", &prev_pane],
        "kill-pane" => vec!["kill-pane", "-t", session],
        "zoom-pane" => vec!["resize-pane", "-Z", "-t", session],
        _ => return Err(anyhow!("unknown command: {}", command)),
    };

    let output = Command::new("tmux")
        .args(&args)
        .output()
        .await
        .context("failed to execute tmux")?;

    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        // Don't error if kill-pane/kill-window closes the last one
        if msg.contains("no remaining") || msg.contains("session not found") {
            return Ok(msg);
        }
        return Err(anyhow!("tmux {} failed: {}", command, msg));
    }

    Ok(String::from_utf8_lossy(&output.stdout).to_string())
}

/// Capture the scrollback history of the active pane in a session.
/// Returns the content with ANSI escape sequences preserved.
pub async fn capture_history(session: &str, lines: i32) -> Result<String> {
    let start = format!("-{}", lines);
    let output = Command::new("tmux")
        .args([
            "capture-pane",
            "-p",     // print to stdout
            "-e",     // include escape sequences (colors)
            "-S", &start,  // start N lines back
            "-t", session,
        ])
        .output()
        .await
        .context("failed to execute tmux capture-pane")?;

    if !output.status.success() {
        let msg = String::from_utf8_lossy(&output.stderr).trim().to_string();
        return Err(anyhow!("tmux capture-pane failed: {}", msg));
    }

    Ok(String::from_utf8_lossy(&output.stdout).to_string())
}