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#!/bin/sh
# Usage: echo "text" | copy [register]
# Example: echo "Hello" | copy a
TARGET_REG=$1
RAW_INPUT=$(cat)
B64_TEXT=$(echo "$RAW_INPUT" | base64 | tr -d '\n')
# 1. Validate Register (Must be a single letter a-z or A-Z)
# This prevents malicious or malformed register names.
if [ -n "$TARGET_REG" ]; then
if ! echo "$TARGET_REG" | grep -q '^[a-zA-Z]$'; then
echo "Error: Register must be a single letter [a-zA-Z]." >&2
exit 1
fi
# 2. Update Neovim Register via internal Lua decoder
if [ -n "$NVIM" ]; then
# <C-\><C-N> ensures we are in Normal mode.
# 'i' at the end returns us to Terminal-Insert mode.
nvim --server "$NVIM" --remote-send \
"<C-\><C-N>:lua vim.fn.setreg('$TARGET_REG', vim.base64.decode('$B64_TEXT'))<CR>i"
fi
fi
# 3. Dynamic TTY Detection (Fixes stale SSH_TTY in Tmux)
if [ -n "$TMUX" ]; then
OUTPUT=$(tmux display-message -p '#{client_tty}')
elif [ -n "$SSH_TTY" ]; then
OUTPUT="$SSH_TTY"
else
OUTPUT="/dev/stdout"
fi
# 4. Send OSC 52 Sequence to the Terminal
if [ -n "$TMUX" ]; then
# Double-wrapped for Tmux passthrough (DCS)
printf "\033Ptmux;\033\033]52;c;%s\007\033\\" "$B64_TEXT" > "$OUTPUT"
elif [ -n "$NVIM" ]; then
# Wrapped for Neovim terminal passthrough
printf "\033P\033]52;c;%s\007\033\\" "$B64_TEXT" > "$OUTPUT"
else
# Standard OSC 52
printf "\033]52;c;%s\007" "$B64_TEXT" > "$OUTPUT"
fi
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