Add rofi launcher for tmux Codex and nixos agent notes

dotfiles/lib/bin/rofi_tmcodex.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Pick a directory via rofi, then start Codex in a tmux session rooted there.
+# Remembers previously used directories in:
+#   ${XDG_STATE_HOME:-~/.local/state}/rofi-tmcodex/dirs
+
+state_dir="${XDG_STATE_HOME:-$HOME/.local/state}/rofi-tmcodex"
+history_file="$state_dir/dirs"
+mkdir -p "$state_dir"
+touch "$history_file"
+
+emit_candidates() {
+  # 1) Previously-used dirs (most recent first).
+  cat "$history_file" 2>/dev/null || true
+
+  # 2) A few common roots.
+  for d in \
+    "$HOME/dotfiles" \
+    "$HOME/dotfiles/nixos" \
+    "$HOME/Projects" \
+    "$HOME/config" \
+    "$HOME/org"
+  do
+    [[ -d "$d" ]] && printf '%s\n' "$d"
+  done
+
+  # 3) Shallow git repo discovery under a few likely roots.
+  if command -v fd >/dev/null 2>&1; then
+    local root gitdir
+    for root in "$HOME/Projects" "$HOME/dotfiles" "$HOME/config" "$HOME/org"; do
+      [[ -d "$root" ]] || continue
+      # Find ".git" directories; print their parent (repo root).
+      # Keep it shallow for speed.
+      while IFS= read -r gitdir; do
+        printf '%s\n' "${gitdir%/.git}"
+      done < <(fd -H -a -t d -d 4 '^\\.git$' "$root" 2>/dev/null || true)
+    done
+  fi
+}
+
+dedup() {
+  awk 'NF && !seen[$0]++'
+}
+
+selected_dir="$(
+  emit_candidates | dedup | rofi -dmenu -i -p 'tmcodex dir'
+)"
+
+[[ -n "${selected_dir}" ]] || exit 0
+
+# Expand ~ manually (rofi doesn't).
+case "$selected_dir" in
+  "~"|"~/"*)
+    selected_dir="$HOME${selected_dir:1}"
+    ;;
+esac
+
+if command -v realpath >/dev/null 2>&1; then
+  selected_dir="$(realpath -m -- "$selected_dir" 2>/dev/null || printf '%s' "$selected_dir")"
+fi
+
+if [[ ! -d "$selected_dir" ]]; then
+  # Fail quietly; rofi launchers generally shouldn't spam terminals.
+  exit 1
+fi
+
+# Update history (most recent first, unique, cap size).
+tmp="$(mktemp)"
+{
+  printf '%s\n' "$selected_dir"
+  cat "$history_file"
+} | dedup | head -n 200 >"$tmp"
+mv -f "$tmp" "$history_file"
+
+# rofi launches typically have no controlling terminal. Start the agent detached
+# inside tmux (tmux allocates a pty for the window). You can attach later.
+base="$(basename -- "$selected_dir")"
+ck="$(printf '%s' "$selected_dir" | cksum | awk '{print $1}')"
+session="codex-${base}-${ck}"
+# tmux is picky; keep session name simple.
+session="$(printf '%s' "$session" | tr -cs 'A-Za-z0-9_-' '-' | sed 's/^-//;s/-$//')"
+
+if tmux has-session -t "$session" 2>/dev/null; then
+  exec tmux new-window -t "$session" -c "$selected_dir" codex --dangerously-bypass-approvals-and-sandbox
+else
+  exec tmux new-session -d -s "$session" -c "$selected_dir" codex --dangerously-bypass-approvals-and-sandbox
+fi

dotfiles/lib/functions/tmcodex

@@ -1,6 +1,21 @@
 #!/usr/bin/env sh
 
 function tmcodex {
+    # Record launch directories so rofi_tmcodex can offer good defaults.
+    state_dir="${XDG_STATE_HOME:-$HOME/.local/state}/rofi-tmcodex"
+    history_file="$state_dir/dirs"
+    mkdir -p "$state_dir" 2>/dev/null || true
+    if [ -d "$PWD" ]; then
+        tmp="$(mktemp 2>/dev/null || true)"
+        if [ -n "$tmp" ]; then
+            { printf '%s\n' "$PWD"; cat "$history_file" 2>/dev/null || true; } \
+                | awk 'NF && !seen[$0]++' \
+                | head -n 200 >"$tmp" 2>/dev/null || true
+            mv -f "$tmp" "$history_file" 2>/dev/null || true
+        else
+            printf '%s\n' "$PWD" >>"$history_file" 2>/dev/null || true
+        fi
+    fi
     trw codex --dangerously-bypass-approvals-and-sandbox "$@"
 }
 

nixos/AGENTS.md

@@ -0,0 +1,25 @@
+# Agent Notes (dotfiles/nixos)
+
+This repository is a single git repo rooted at `~/dotfiles`. This `nixos/` directory is the NixOS flake, but most "user command" scripts and shell functions live outside of it.
+
+## Where To Put Things
+
+- Shell functions (autoloaded by zsh): `../dotfiles/lib/functions/`
+  - These are added to `fpath` in `nixos/environment.nix`, then autoloaded.
+- User-executable scripts on PATH: `../dotfiles/lib/bin/`
+  - This directory is added to PATH in `nixos/environment.nix` via `${libDir}/bin`.
+
+Avoid dropping scripts in `~/bin` or `~/.local/bin` unless the user explicitly asks.
+
+## NixOS Rebuild Workflow
+
+- Run `just switch` from `~/dotfiles/nixos` (not `nixos-rebuild` directly).
+- Host configs live under `machines/`.
+
+## Rofi/Tmux Integration Pointers
+
+- Existing rofi scripts live in `../dotfiles/lib/bin/` (e.g. `rofi_command.sh`).
+- Keybind locations:
+  - Hyprland: `../dotfiles/config/hypr/hyprland.conf`
+  - XMonad: `../dotfiles/config/xmonad/xmonad.hs`
+