#!/bin/sh

show_help() {

cat << EOF

nvux - Open files in existing neovim instance within tmux

USAGE:

nvux [OPTIONS] [FILE] [+LINE]

OPTIONS:

-h, --help Show this help message and exit

ARGUMENTS:

FILE Path to file to open (optional)

+LINE Line number to jump to after opening file (optional)

Must be preceded by '+' (e.g., +42)

DESCRIPTION:

nvux opens files in an existing Neovim instance running

within a tmux session. It searches for active Neovim processes in the

current tmux session and opens the specified file in that instance.

If no existing Neovim instance is found, nvux will create one in a new pane.

When not running within a tmux session, nvux falls back to launching

regular Neovim.

EXAMPLES:

nvux # Open nvim in existing tmux instance

nvux file.txt # Open file.txt

nvux file.txt +25 # Open file.txt and jump to line 25

nvux /path/to/script.sh +1 # Open script.sh and jump to first line

EOF

}

# Parse options

while [ $# -gt 0 ]; do

case "$1" in

-h|--help)

show_help

exit 0

;;

-*)

echo "Unknown option: $1" >&2

echo "Use -h for help" >&2

exit 1

;;

*)

break

;;

esac

shift

done

FILE="$1"

LINE="$2"

# Fallback to regular nvim if no tmux

if ! tmux info &>/dev/null; then

exec nvim "$@"

exit

fi

# Get current tmux session

SESSION=$(tmux display-message -p '#S')

# Find panes running nvim across ALL sessions and windows

NVIM_INFO=$(tmux list-panes -s -F '#{session_name}:#{window_index}.#{pane_index} #{pane_current_command}' | grep nvim | head -1)

if [ -n "$NVIM_INFO" ]; then

# Extract the session:window.pane part

NVIM_TARGET=$(echo "$NVIM_INFO" | cut -d' ' -f1)

# Switch to the session and window containing nvim

tmux switch-client -t "$NVIM_TARGET"

tmux select-pane -t "$NVIM_TARGET"

# Sends an escape in case the user is in insert mode.

tmux send-keys -t "$NVIM_TARGET" Escape

# Open file in existing nvim

if [ -n "$LINE" ]; then

tmux send-keys -t "$NVIM_TARGET" ":e $FILE | $LINE" Enter

else

tmux send-keys -t "$NVIM_TARGET" ":e $FILE" Enter

fi

else

# Create new pane with nvim in current session

if [ -n "$FILE" ]; then

tmux new-window -c "$(pwd)" "nvim $*"

else

tmux new-window -c "$(pwd)" "nvim"

fi

fi