feat: tmux module (#229)

Closes #203
/claim #203

## Description

Introduce the `tmux` module

## Demo

https://www.loom.com/share/ec8169d34c3043f7af2163b1a1a14a4b?sid=1ea8bcb2-3db0-43ca-965a-5ed42eec3448

## Type of Change

- [x] New module
- [ ] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/anomaly/modules/tmux`  
**New version:** `v1.0.0`  
**Breaking change:** [ ] Yes [x] No

## Testing & Validation

- [x] Tests pass (`bun test`)
- [x] Code formatted (`bun run fmt`)
- [x] Changes tested locally

## Related Issues
#203

.gitignore

@@ -145,3 +145,6 @@ dist
 
 # Generated credentials from google-github-actions/auth
 gha-creds-*.json
+
+# IDEs
+.idea

.icons/tmux.svg

@@ -0,0 +1 @@
+<svg fill="none" height="2500" width="2500" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 160 160"><g clip-rule="evenodd" fill-rule="evenodd"><path d="M0 116h160v28.996c0 8.287-6.722 15.004-14.998 15.004H14.998C6.716 160 0 153.293 0 144.996zm0 0h160v30H0z" fill="#1bb91f"/><path d="M83 70V0h-6v146h6V76h77v-6zM0 15.007C0 6.719 6.722 0 14.998 0h130.004C153.285 0 160 6.725 160 15.007V146H0z" fill="#3c3c3c"/></g></svg>

registry/anomaly/README.md

@@ -0,0 +1,13 @@
+---
+display_name: "Jay Kumar"
+bio: "I'm a Software Engineer :)"
+avatar_url: "./.images/avatar.png"
+github: "35C4n0r"
+linkedin: "https://www.linkedin.com/in/jaykum4r"
+support_email: "work.jaykumar@gmail.com"
+status: "community"
+---
+
+# Your Name
+
+I'm a Software Engineer :)

registry/anomaly/modules/tmux/README.md

@@ -0,0 +1,101 @@
+---
+display_name: "Tmux"
+description: "Tmux for coder agent :)"
+icon: "../../../../.icons/tmux.svg"
+verified: false
+tags: ["tmux", "terminal", "persistent"]
+---
+
+# tmux
+
+This module provisions and configures [tmux](https://github.com/tmux/tmux) with session persistence and plugin support
+for a Coder agent. It automatically installs tmux, the Tmux Plugin Manager (TPM), and a set of useful plugins, and sets
+up a default or custom tmux configuration with session save/restore capabilities.
+
+```tf
+module "tmux" {
+  source   = "registry.coder.com/anomaly/tmux/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.example.id
+}
+```
+
+## Features
+
+- Installs tmux if not already present
+- Installs TPM (Tmux Plugin Manager)
+- Configures tmux with plugins for sensible defaults, session persistence, and automation:
+  - `tmux-plugins/tpm`
+  - `tmux-plugins/tmux-sensible`
+  - `tmux-plugins/tmux-resurrect`
+  - `tmux-plugins/tmux-continuum`
+- Supports custom tmux configuration
+- Enables automatic session save
+- Configurable save interval
+- **Supports multiple named tmux sessions, each as a separate app in the Coder UI**
+
+## Usage
+
+```tf
+module "tmux" {
+  source        = "registry.coder.com/anomaly/tmux/coder"
+  version       = "1.0.0"
+  agent_id      = coder_agent.example.id
+  tmux_config   = ""                        # Optional: custom tmux.conf content
+  save_interval = 1                         # Optional: save interval in minutes
+  sessions      = ["default", "dev", "ops"] # Optional: list of tmux sessions
+  order         = 1                         # Optional: UI order
+  group         = "Terminal"                # Optional: UI group
+  icon          = "/icon/tmux.svg"          # Optional: app icon
+}
+```
+
+## Multi-Session Support
+
+This module can provision multiple tmux sessions, each as a separate app in the Coder UI. Use the `sessions` variable to specify a list of session names. For each session, a `coder_app` is created, allowing you to launch or attach to that session directly from the UI.
+
+- **sessions**: List of tmux session names (default: `["default"]`).
+
+## How It Works
+
+- **tmux Installation:**
+  - Checks if tmux is installed; if not, installs it using the system's package manager (supports apt, yum, dnf,
+    zypper, apk, brew).
+- **TPM Installation:**
+  - Installs the Tmux Plugin Manager (TPM) to `~/.tmux/plugins/tpm` if not already present.
+- **tmux Configuration:**
+  - If `tmux_config` is provided, writes it to `~/.tmux.conf`.
+  - Otherwise, generates a default configuration with plugin support and session persistence (using tmux-resurrect and
+    tmux-continuum).
+  - Sets up key bindings for quick session save (`Ctrl+s`) and restore (`Ctrl+r`).
+- **Plugin Installation:**
+  - Installs plugins via TPM.
+- **Session Persistence:**
+  - Enables automatic session save/restore at the configured interval.
+
+## Example
+
+```tf
+module "tmux" {
+  source      = "registry.coder.com/anomaly/tmux/coder"
+  version     = "1.0.0"
+  agent_id    = var.agent_id
+  sessions    = ["default", "dev", "anomaly"]
+  tmux_config = <<-EOT
+    set -g mouse on
+    set -g history-limit 10000
+  EOT
+  group       = "Terminal"
+  order       = 2
+}
+```
+
+> [!IMPORTANT]
+>
+> - If you provide a custom `tmux_config`, it will completely replace the default configuration. Ensure you include plugin
+>   and TPM initialization lines if you want plugin support and session persistence.
+> - The script will attempt to install dependencies using `sudo` where required.
+> - If `git` is not installed, TPM installation will fail.
+> - If you are using custom config, you'll be responsible for setting up persistence and plugins.
+> - The `order`, `group`, and `icon` variables allow you to customize how tmux apps appear in the Coder UI.
+> - In case of session restart or shh reconnection, the tmux session will be automatically restored :)

registry/anomaly/modules/tmux/main.test.ts

@@ -0,0 +1,35 @@
+import { describe, it, expect } from "bun:test";
+import {
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+  findResourceInstance,
+} from "~test";
+import path from "path";
+
+const moduleDir = path.resolve(__dirname);
+
+const requiredVars = {
+  agent_id: "dummy-agent-id",
+};
+
+describe("tmux module", async () => {
+  await runTerraformInit(moduleDir);
+
+  // 1. Required variables
+  testRequiredVariables(moduleDir, requiredVars);
+
+  // 2. coder_script resource is created
+  it("creates coder_script resource", async () => {
+    const state = await runTerraformApply(moduleDir, requiredVars);
+    const scriptResource = findResourceInstance(state, "coder_script");
+    expect(scriptResource).toBeDefined();
+    expect(scriptResource.agent_id).toBe(requiredVars.agent_id);
+
+    // check that the script contains expected lines
+    expect(scriptResource.script).toContain("Installing tmux");
+    expect(scriptResource.script).toContain("Installing Tmux Plugin Manager (TPM)");
+    expect(scriptResource.script).toContain("tmux configuration created at");
+    expect(scriptResource.script).toContain("✅ tmux setup complete!");
+  });
+});

registry/anomaly/modules/tmux/main.tf

@@ -0,0 +1,78 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 2.5"
+    }
+  }
+}
+
+variable "agent_id" {
+  type        = string
+  description = "The ID of a Coder agent."
+}
+
+variable "tmux_config" {
+  type        = string
+  description = "Custom tmux configuration to apply."
+  default     = ""
+}
+
+variable "save_interval" {
+  type        = number
+  description = "Save interval (in minutes)."
+  default     = 1
+}
+
+variable "order" {
+  type        = number
+  description = "The order determines the position of app in the UI presentation. The lowest order is shown first and apps with equal order are sorted by name (ascending order)."
+  default     = null
+}
+
+variable "group" {
+  type        = string
+  description = "The name of a group that this app belongs to."
+  default     = null
+}
+
+variable "icon" {
+  type        = string
+  description = "The icon to use for the app."
+  default     = "/icon/tmux.svg"
+}
+
+variable "sessions" {
+  type        = list(string)
+  description = "List of tmux sessions to create or start."
+  default     = ["default"]
+}
+
+resource "coder_script" "tmux" {
+  agent_id     = var.agent_id
+  display_name = "tmux"
+  icon         = "/icon/terminal.svg"
+  script = templatefile("${path.module}/scripts/run.sh", {
+    TMUX_CONFIG   = var.tmux_config
+    SAVE_INTERVAL = var.save_interval
+  })
+  run_on_start = true
+  run_on_stop  = false
+}
+
+resource "coder_app" "tmux_sessions" {
+  for_each = toset(var.sessions)
+
+  agent_id     = var.agent_id
+  slug         = "tmux-${each.value}"
+  display_name = "tmux - ${each.value}"
+  icon         = var.icon
+  order        = var.order
+  group        = var.group
+
+  command = templatefile("${path.module}/scripts/start.sh", {
+    SESSION_NAME = each.value
+  })
+}

registry/anomaly/modules/tmux/scripts/run.sh

@@ -0,0 +1,153 @@
+#!/usr/bin/env bash
+
+BOLD='\033[0;1m'
+
+# Convert templated variables to shell variables
+SAVE_INTERVAL="${SAVE_INTERVAL}"
+TMUX_CONFIG="${TMUX_CONFIG}"
+
+# Function to install tmux
+install_tmux() {
+    printf "Checking for tmux installation\n"
+
+    if command -v tmux &> /dev/null; then
+        printf "tmux is already installed \n\n"
+        return 0
+    fi
+
+    printf "Installing tmux \n\n"
+
+    # Detect package manager and install tmux
+    if command -v apt-get &> /dev/null; then
+        sudo apt-get update
+        sudo apt-get install -y tmux
+    elif command -v yum &> /dev/null; then
+        sudo yum install -y tmux
+    elif command -v dnf &> /dev/null; then
+        sudo dnf install -y tmux
+    elif command -v zypper &> /dev/null; then
+        sudo zypper install -y tmux
+    elif command -v apk &> /dev/null; then
+        sudo apk add tmux
+    elif command -v brew &> /dev/null; then
+        brew install tmux
+    else
+        printf "No supported package manager found. Please install tmux manually. \n"
+        exit 1
+    fi
+
+    printf "tmux installed successfully \n"
+}
+
+# Function to install Tmux Plugin Manager (TPM)
+install_tpm() {
+    local tpm_dir="$HOME/.tmux/plugins/tpm"
+
+    if [ -d "$tpm_dir" ]; then
+        printf "TPM is already installed"
+        return 0
+    fi
+
+    printf "Installing Tmux Plugin Manager (TPM) \n"
+
+    # Create plugins directory
+    mkdir -p "$HOME/.tmux/plugins"
+
+    # Clone TPM repository
+    if command -v git &> /dev/null; then
+        git clone https://github.com/tmux-plugins/tpm "$tpm_dir"
+        printf "TPM installed successfully"
+    else
+        printf "Git is not installed. Please install git to use tmux plugins. \n"
+        exit 1
+    fi
+}
+
+# Function to create tmux configuration
+setup_tmux_config() {
+    printf "Setting up tmux configuration \n"
+
+    local config_dir="$HOME/.tmux"
+    local config_file="$HOME/.tmux.conf"
+
+    mkdir -p "$config_dir"
+
+    if [ -n "$TMUX_CONFIG" ]; then
+        printf "$TMUX_CONFIG" > "$config_file"
+        printf "$${BOLD}Custom tmux configuration applied at {$config_file} \n\n"
+    else
+        cat > "$config_file" << EOF
+# Tmux Configuration File
+
+# =============================================================================
+# PLUGIN CONFIGURATION
+# =============================================================================
+
+# List of plugins
+set -g @plugin 'tmux-plugins/tpm'
+set -g @plugin 'tmux-plugins/tmux-sensible'
+set -g @plugin 'tmux-plugins/tmux-resurrect'
+set -g @plugin 'tmux-plugins/tmux-continuum'
+
+# tmux-continuum configuration
+set -g @continuum-restore 'on'
+set -g @continuum-save-interval '$${SAVE_INTERVAL}'
+set -g @continuum-boot 'on'
+set -g status-right 'Continuum status: #{continuum_status}'
+
+# =============================================================================
+# KEY BINDINGS FOR SESSION MANAGEMENT
+# =============================================================================
+
+# Quick session save and restore
+bind C-s run-shell "~/.tmux/plugins/tmux-resurrect/scripts/save.sh"
+bind C-r run-shell "~/.tmux/plugins/tmux-resurrect/scripts/restore.sh"
+
+# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
+run '~/.tmux/plugins/tpm/tpm'
+EOF
+        printf "tmux configuration created at {$config_file} \n\n"
+    fi
+}
+
+# Function to install tmux plugins
+install_plugins() {
+    printf "Installing tmux plugins"
+
+    # Check if TPM is installed
+    if [ ! -d "$HOME/.tmux/plugins/tpm" ]; then
+        printf "TPM is not installed. Cannot install plugins. \n"
+        return 1
+    fi
+
+    # Install plugins using TPM
+    "$HOME/.tmux/plugins/tpm/bin/install_plugins"
+
+    printf "tmux plugins installed successfully \n"
+}
+
+# Main execution
+main() {
+    printf "$${BOLD} 🛠️Setting up tmux with session persistence! \n\n"
+    printf ""
+
+    # Install dependencies
+    install_tmux
+    install_tpm
+
+    # Setup tmux configuration
+    setup_tmux_config
+
+    # Install plugins
+    install_plugins
+
+    printf "$${BOLD}✅ tmux setup complete! \n\n"
+
+    printf "$${BOLD} Attempting to restore sessions\n"
+    tmux new-session -d \; source-file ~/.tmux.conf \; run-shell '~/.tmux/plugins/tmux-resurrect/scripts/restore.sh'
+    printf "$${BOLD} Sessions restored: -> %s\n" "$(tmux ls)"
+
+}
+
+# Run main function
+main

registry/anomaly/modules/tmux/scripts/start.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# Convert templated variables to shell variables
+SESSION_NAME='${SESSION_NAME}'
+
+# Function to check if tmux is installed
+check_tmux() {
+  if ! command -v tmux &> /dev/null; then
+    echo "tmux is not installed. Please run the tmux setup script first."
+    exit 1
+  fi
+}
+
+# Function to handle a single session
+handle_session() {
+  local session_name="$1"
+
+  # Check if the session exists
+  if tmux has-session -t "$session_name" 2>/dev/null; then
+    echo "Session '$session_name' exists, attaching to it..."
+    tmux attach-session -t "$session_name"
+  else
+    echo "Session '$session_name' does not exist, creating it..."
+    tmux new-session -d -s "$session_name"
+    tmux attach-session -t "$session_name"
+  fi
+}
+
+# Main function
+main() {
+  # Check if tmux is installed
+  check_tmux
+  handle_session "${SESSION_NAME}"
+}
+
+# Run the main function
+main