feat: initial release - mobile-first web terminal with tmux touch toolbar and push notifications

.gitignore

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+*.env
+.env*
+*.pem
+*.key
+__pycache__/
+*.pyc

LICENSE

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+MIT License
+
+Copyright (c) 2026 Seth Freiberg
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# sethmux
+
+Mobile-first web terminal powered by [ttyd](https://github.com/tsl0922/ttyd) + [tmux](https://github.com/tmux/tmux). One persistent session, multiple tabs, accessible from any browser.
+
+## Features
+
+- **Single persistent tmux session** — shared across all connected clients
+- **Mobile touch toolbar** — on-screen buttons for tabs, signals, navigation, splits, and text selection
+- **Text selection mode** — tap `Sel` to select and copy text on touch devices
+- **Push notifications** — `sethmux-notify "Build done!"` sends browser notifications
+- **PWA installable** — add to home screen for app-like experience
+- **Dark theme** — Sethian dark + orange (#D35400) accent
+
+## Architecture
+
+```
+Browser -> Caddy (HTTPS + Auth) -> ttyd (port 7683) -> tmux session "sethmux"
+                                -> notify-server (port 7684) -> /api/notifications
+```
+
+## Quick Start
+
+```bash
+# Dependencies
+apt install -y tmux
+curl -sL https://github.com/tsl0922/ttyd/releases/latest/download/ttyd.x86_64 -o /usr/local/bin/ttyd
+chmod +x /usr/local/bin/ttyd
+
+# Deploy
+sudo mkdir -p /opt/sethmux
+sudo cp static/* /opt/sethmux/
+sudo cp notify-server.py /opt/sethmux/
+sudo cp sethmux-notify /usr/local/bin/
+sudo cp config/tmux.conf ~/.tmux.conf
+sudo cp systemd/*.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable --now sethmux sethmux-notify
+```
+
+Open `http://YOUR_IP:7683` in a browser.
+
+## Mobile Toolbar
+
+Appears on screens < 900px. Buttons:
+
+| Button | Action | tmux Key |
+|--------|--------|----------|
+| **+Tab** | New tab | `Ctrl-A c` |
+| **Next/Prev** | Switch tabs | `Ctrl-A n/p` |
+| **^C / ^D / Clr** | Interrupt / EOF / Clear | |
+| **Esc / Tab / Up / Down** | Navigation | |
+| **Sel** | Text selection mode | |
+| **Spl** | Split vertical | `Ctrl-A %` |
+| **Pane** | Cycle panes | `Ctrl-A o` |
+| **Kill** | Kill pane/tab | `Ctrl-A x` |
+
+## Push Notifications
+
+```bash
+sethmux-notify "Deploy complete!"
+echo "done" | sethmux-notify
+make build && sethmux-notify "OK" || sethmux-notify "FAIL"
+```
+
+## tmux Keybindings
+
+Prefix: `Ctrl-A` (not the default Ctrl-B — easier on mobile).
+
+| Key | Action |
+|-----|--------|
+| `Ctrl-A c` | New window |
+| `Ctrl-A n / p` | Next / previous |
+| `Ctrl-A % / "` | Split vertical / horizontal |
+| `Ctrl-A o` | Cycle panes |
+| `Ctrl-A x` | Kill pane |
+| `Alt-1` to `Alt-5` | Jump to window |
+| Mouse scroll | History |
+
+## Reverse Proxy (Caddy)
+
+```
+mux.example.com {
+    # your auth here
+    handle /toolbar.js  { root * /opt/sethmux; file_server }
+    handle /manifest.json { root * /opt/sethmux; file_server }
+    handle /icon-*.png { root * /opt/sethmux; file_server }
+    handle /api/* { uri strip_prefix /api; reverse_proxy localhost:7684 }
+    handle { reverse_proxy localhost:7683 }
+}
+```
+
+## Files
+
+```
+sethmux/
+  static/
+    index.html          # Custom ttyd page with toolbar injection
+    toolbar.js          # Mobile touch toolbar
+    manifest.json       # PWA manifest
+    icon-192.png        # PWA icon
+    icon-512.png        # PWA icon
+  config/
+    tmux.conf           # Sethian-themed tmux config
+  systemd/
+    sethmux.service     # ttyd + tmux systemd unit
+    sethmux-notify.service  # Notification API unit
+  notify-server.py      # Push notification HTTP API
+  sethmux-notify        # CLI notification command
+```
+
+## License
+
+MIT

config/tmux.conf

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+# Sethian tmux config
+
+# Remap prefix to Ctrl-a (easier on mobile)
+unbind C-b
+set -g prefix C-a
+bind C-a send-prefix
+
+# Easy tab management
+bind -n M-t new-window
+bind -n M-w kill-window
+bind -n M-1 select-window -t 0
+bind -n M-2 select-window -t 1
+bind -n M-3 select-window -t 2
+bind -n M-4 select-window -t 3
+bind -n M-5 select-window -t 4
+bind -n M-Left previous-window
+bind -n M-Right next-window
+
+# Mouse support (critical for mobile/touch)
+set -g mouse on
+
+# Scrollback
+set -g history-limit 50000
+
+# Start numbering at 1
+set -g base-index 1
+setw -g pane-base-index 1
+
+# Renumber windows on close
+set -g renumber-windows on
+
+# Status bar - Sethian dark + orange
+set -g status-style "bg=#1a1a1a,fg=#e0e0e0"
+set -g status-left "#[bg=#D35400,fg=#0a0a0a,bold] #S #[bg=#1a1a1a] "
+set -g status-right "#[fg=#D35400]%H:%M #[fg=#666666]| #[fg=#e0e0e0]%b %d"
+set -g status-left-length 20
+set -g status-right-length 30
+
+# Window status
+setw -g window-status-format " #[fg=#888888]#I:#W "
+setw -g window-status-current-format "#[bg=#D35400,fg=#0a0a0a,bold] #I:#W "
+setw -g window-status-separator ""
+
+# Pane borders
+set -g pane-border-style "fg=#333333"
+set -g pane-active-border-style "fg=#D35400"
+
+# Terminal settings
+set -g default-terminal "tmux-256color"
+set -ga terminal-overrides ",xterm-256color:Tc"
+
+# Reduce escape delay
+set -sg escape-time 10

notify-server.py

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+#!/usr/bin/env python3
+"""Tiny HTTP server for terminal notifications. Serves /api/notifications."""
+import http.server
+import json
+import os
+import time
+
+NOTIFY_FILE = "/tmp/kitty-notify"
+PORT = 7682
+
+class Handler(http.server.BaseHTTPRequestHandler):
+    def do_GET(self):
+        if self.path == "/api/notifications":
+            msg = ""
+            if os.path.exists(NOTIFY_FILE):
+                try:
+                    mtime = os.path.getmtime(NOTIFY_FILE)
+                    if time.time() - mtime < 30:  # only show notifications < 30s old
+                        with open(NOTIFY_FILE) as f:
+                            msg = f.read().strip()
+                except:
+                    pass
+            self.send_response(200)
+            self.send_header("Content-Type", "application/json")
+            self.send_header("Access-Control-Allow-Origin", "*")
+            self.end_headers()
+            self.wfile.write(json.dumps({"message": msg}).encode())
+        else:
+            self.send_response(404)
+            self.end_headers()
+
+    def log_message(self, format, *args):
+        pass  # quiet
+
+if __name__ == "__main__":
+    server = http.server.HTTPServer(("0.0.0.0", PORT), Handler)
+    server.serve_forever()

sethmux-notify

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+#!/bin/bash
+# Send a push notification to kitty.sethpc.xyz
+# Usage: sethmux-notify "Build complete!" or echo "done" | sethmux-notify
+if [ -n "$1" ]; then
+    echo "$*" > /tmp/sethmux-notify
+else
+    cat > /tmp/sethmux-notify
+fi

static/manifest.json

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+{
+  "name": "sethmux",
+  "short_name": "sethmux",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0a0a0a",
+  "theme_color": "#D35400",
+  "icons": [
+    {"src": "/icon-192.png", "sizes": "192x192", "type": "image/png"},
+    {"src": "/icon-512.png", "sizes": "512x512", "type": "image/png"}
+  ]
+}

static/toolbar.js

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+(function(){
+  if(window._toolbar) return;
+  window._toolbar=true;
+
+  var css=document.createElement('style');
+  css.textContent=`
+    #mb{display:none;position:fixed;bottom:0;left:0;right:0;background:#111;
+      border-top:2px solid #D35400;padding:5px 4px;gap:4px;justify-content:center;
+      flex-wrap:wrap;z-index:99999}
+    #mb button{background:#222;color:#ccc;border:1px solid #444;border-radius:5px;
+      padding:10px 12px;font-size:14px;font-family:ui-monospace,monospace;
+      cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;
+      min-width:42px;text-align:center;user-select:none}
+    #mb button:active{background:#D35400;color:#0a0a0a;border-color:#D35400}
+    #mb button.hi{border-color:#D35400;color:#D35400}
+    #mb button.on{background:#D35400;color:#0a0a0a;border-color:#D35400}
+    #mb .sep{width:1px;background:#333;margin:0 2px;align-self:stretch}
+    @media(max-width:900px){#mb{display:flex}}
+    body.selmode .xterm-screen{pointer-events:none!important;
+      user-select:text!important;-webkit-user-select:text!important}
+  `;
+  document.head.appendChild(css);
+
+  var bar=document.createElement('div');
+  bar.id='mb';
+  bar.innerHTML=
+    '<button class="hi" data-k="\\x01c">+Tab</button>'+
+    '<button data-k="\\x01n">Next</button>'+
+    '<button data-k="\\x01p">Prev</button>'+
+    '<div class="sep"></div>'+
+    '<button data-k="\\x03">^C</button>'+
+    '<button data-k="\\x04">^D</button>'+
+    '<button data-k="\\x0c">Clr</button>'+
+    '<div class="sep"></div>'+
+    '<button data-k="\\x1b">Esc</button>'+
+    '<button data-k="\\t">Tab</button>'+
+    '<button data-k="\\x1bOA">\u25B2</button>'+
+    '<button data-k="\\x1bOB">\u25BC</button>'+
+    '<div class="sep"></div>'+
+    '<button class="hi" id="selbtn" data-sel="1">Sel</button>'+
+    '<button data-k="\\x01%">Spl</button>'+
+    '<button data-k="\\x01o">Pane</button>'+
+    '<button data-k="\\x01x">Kill</button>';
+  document.body.appendChild(bar);
+
+  function send(k){
+    if(document.body.classList.contains('selmode')) toggleSel();
+    k=k.replace(/\\x([0-9a-f]{2})/gi,function(_,h){return String.fromCharCode(parseInt(h,16));});
+    k=k.replace(/\\t/g,'\t');
+    if(window.term){window.term.input(k);window.term.focus();}
+  }
+
+  function toggleSel(){
+    var b=document.getElementById('selbtn');
+    document.body.classList.toggle('selmode');
+    if(document.body.classList.contains('selmode')){
+      b.classList.add('on');b.textContent='Done';
+    } else {
+      b.classList.remove('on');b.textContent='Sel';
+      window.getSelection().removeAllRanges();
+      if(window.term) window.term.focus();
+    }
+  }
+
+  bar.addEventListener('click',function(e){
+    var btn=e.target.closest('button');
+    if(!btn) return;
+    if(btn.dataset.sel) return toggleSel();
+    if(btn.dataset.k) send(btn.dataset.k);
+  });
+
+  // Shrink terminal for toolbar on mobile
+  var obs=new MutationObserver(function(){
+    var el=document.querySelector('.xterm');
+    if(el && window.innerWidth<=900){
+      el.style.height='calc(100vh - 54px)';
+      if(window.term && window.term.fit) window.term.fit();
+    }
+  });
+  obs.observe(document.body,{childList:true,subtree:true});
+})();

systemd/sethmux-notify.service

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+[Unit]
+Description=sethmux notification API
+After=network.target
+
+[Service]
+Type=simple
+User=rdp
+ExecStart=/usr/bin/python3 /opt/sethmux/notify-server.py
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target

systemd/sethmux.service

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+[Unit]
+Description=sethmux - web terminal (mux.sethpc.xyz)
+After=network.target
+
+[Service]
+Type=simple
+User=rdp
+Group=rdp
+
+ExecStartPre=/bin/bash -c "/usr/bin/tmux kill-session -t sethmux 2>/dev/null; sleep 0.5; /usr/bin/tmux new-session -d -s sethmux -x 120 -y 40"
+ExecStart=/usr/local/bin/ttyd \
+    --port 7683 \
+    --interface 0.0.0.0 \
+    --index /opt/sethmux/index.html \
+    --writable \
+    --check-origin \
+    --max-clients 5 \
+    --ping-interval 30 \
+    --client-option titleFixed=sethmux \
+    --client-option fontSize=18 \
+    --client-option fontFamily=monospace \
+    --client-option enableSixel=true \
+    /usr/bin/tmux attach-session -t sethmux
+
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target