Add zellij alongside tmux

dotfiles/agents/AGENTS.md

@@ -1,8 +1,9 @@
 # Agentic Session Preferences
 
-## Tmux session titling
-- Treat this chat as the controller for the current tmux session.
-- Run the tmux rename one-liner eagerly without checking whether TMUX is set first.
+## Multiplexer session titling
+- Treat this chat as the controller for the current tmux or zellij session.
+- If the current session is in tmux, run the tmux rename one-liner eagerly without checking whether TMUX is set first.
+- If the current session is in zellij, run the zellij rename commands eagerly without checking whether ZELLIJ is set first.
 - Maintain a session/window/pane title that updates when the task focus changes substantially.
 - Prefer automatic titling: infer a concise <task> from the current user request and context without asking.
 - Title format: "<project> - <task>".
@@ -11,11 +12,13 @@
   - <task> is a short, user-friendly description of what we are doing.
 - Ask for a short descriptive <task> only when the task is ambiguous or you are not confident in an inferred title.
 - When the task changes substantially, update the <task> automatically if clear; otherwise ask for an updated <task>.
-- When a title is provided or updated, immediately run this one-liner:
+- When a title is provided or updated, immediately run the matching command for the active multiplexer:
 
   tmux rename-session '<project> - <task>' \; rename-window '<project> - <task>' \; select-pane -T '<project> - <task>'
 
-- Assume you are inside tmux, so do not use -t unless the user asks to target a specific session.
+  zellij action rename-session '<project> - <task>' && zellij action rename-tab '<project> - <task>' && zellij action rename-pane '<project> - <task>'
+
+- Assume you are inside the active multiplexer, so do not use tmux `-t` or zellij targeting flags unless the user asks to target a specific session/tab/pane.
 - For Claude Code sessions, a UserPromptSubmit hook will also update titles automatically based on the latest prompt.
 
 ## Pane usage

dotfiles/agents/hooks/tmux-title.sh

@@ -1,25 +1,33 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-if [[ -z "${TMUX:-}" ]]; then
+if [[ -n "${ZELLIJ:-}" ]]; then
+  multiplexer="zellij"
+elif [[ -n "${TMUX:-}" ]]; then
+  multiplexer="tmux"
+else
   exit 0
 fi
 
 input=$(cat)
 
-read -r cwd prompt <<'PY' < <(python3 - <<'PY'
+mapfile -d '' -t parsed < <(PAYLOAD="$input" python3 - <<'PY'
 import json, os, sys
 try:
-    data = json.load(sys.stdin)
+    data = json.loads(os.environ.get("PAYLOAD", ""))
 except Exception:
     data = {}
 
 cwd = data.get("cwd") or os.getcwd()
 prompt = (data.get("prompt") or "").strip()
-print(cwd)
-print(prompt)
+sys.stdout.write(cwd)
+sys.stdout.write("\0")
+sys.stdout.write(prompt)
+sys.stdout.write("\0")
 PY
 )
+cwd="${parsed[0]:-}"
+prompt="${parsed[1]:-}"
 
 if [[ -z "${cwd}" ]]; then
   cwd="$PWD"
@@ -46,7 +54,7 @@ if [[ -z "$task" ]]; then
   task="work"
 fi
 
-# Trim to a reasonable length for tmux status bars.
+# Trim to a reasonable length for multiplexer UI labels.
 if [[ ${#task} -gt 60 ]]; then
   task="${task:0:57}..."
 fi
@@ -54,7 +62,7 @@ fi
 title="$project - $task"
 
 state_dir="${HOME}/.agents/state"
-state_file="$state_dir/tmux-title"
+state_file="$state_dir/${multiplexer}-title"
 mkdir -p "$state_dir"
 
 if [[ -f "$state_file" ]]; then
@@ -66,5 +74,11 @@ fi
 
 printf '%s' "$title" > "$state_file"
 
-# Update session, window, and pane titles.
-tmux rename-session "$title" \; rename-window "$title" \; select-pane -T "$title"
+# Update session, window/tab, and pane titles.
+if [[ "$multiplexer" == "tmux" ]]; then
+  tmux rename-session "$title" \; rename-window "$title" \; select-pane -T "$title"
+else
+  zellij action rename-session "$title"
+  zellij action rename-tab "$title"
+  zellij action rename-pane "$title"
+fi

dotfiles/cider/bootstrap.json

@@ -170,6 +170,7 @@
     "tig",
     "tmate",
     "tmux",
+    "zellij",
     "unoconv",
     "vim",
     "w3m",

dotfiles/config/taffybar/AGENTS.md

@@ -4,8 +4,8 @@
 - Prefer `just run` (foreground) and `just restart` (background) when running taffybar during iterative work.
 - If running manually, prefer `direnv exec . cabal run` (or `nix develop -c cabal run` if direnv is not active) so you get the right build inputs and environment.
 
-## Tmux session titling
-- If the TMUX environment variable is set, treat this chat as the controller for the current tmux session.
+## Multiplexer session titling
+- If the `TMUX` or `ZELLIJ` environment variable is set, treat this chat as the controller for the current tmux or zellij session.
 - Maintain a session/window/pane title that updates when the task focus changes substantially.
 - Prefer automatic titling: infer a concise <task> from the current user request and context without asking.
 - Title format: "<project> - <task>".
@@ -14,11 +14,13 @@
   - <task> is a short, user-friendly description of what we are doing.
 - Ask for a short descriptive <task> only when the task is ambiguous or you are not confident in an inferred title.
 - When the task changes substantially, update the <task> automatically if clear; otherwise ask for an updated <task>.
-- When a title is provided or updated, immediately run this one-liner:
+- When a title is provided or updated, immediately run the matching command for the active multiplexer:
 
   tmux rename-session '<project> - <task>' \; rename-window '<project> - <task>' \; select-pane -T '<project> - <task>'
 
-- Assume you are inside tmux, so do not use -t unless the user asks to target a specific session.
+  zellij action rename-session '<project> - <task>' && zellij action rename-tab '<project> - <task>' && zellij action rename-pane '<project> - <task>'
+
+- Assume you are inside the active multiplexer, so do not use tmux `-t` or zellij targeting flags unless the user asks to target a specific session/tab/pane.
 
 ## Pane usage
 - Do not create extra panes or windows unless the user asks.
@@ -30,4 +32,3 @@
 
 ## Skills
 A skill is a set of local instructions to follow that is stored in a `SKILL.md` file.
-

nix-darwin/home/common.nix

@@ -110,6 +110,7 @@ in {
     shellAliases = {
       df_ssh = "TERM='xterm-256color' ssh -o StrictHostKeyChecking=no";
       ta = "tmux attach";
+      za = "zellij attach";
     };
     initContent = lib.mkMerge [
       (lib.mkOrder 550 ''

nixos/environment.nix

@@ -82,6 +82,7 @@ with lib;
         df_ssh = "TERM=xterm-256color ssh -o StrictHostKeyChecking=no";
         fix_nix = "LD_LIBRARY_PATH='' nix";
         ta = "tmux attach";
+        za = "zellij attach";
       };
       variables = {
         ROFI_SYSTEMD_TERM = "ghostty -e";

nixos/essential.nix

@@ -56,6 +56,7 @@
     silver-searcher
     skim
     tmux
+    zellij
     unzip
     wget
     xkcdpass