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fix: scope tmux history copy to active pane #1434

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fix: scope tmux history copy to active pane #1434

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16 changes: 14 additions & 2 deletions .bash_aliases.d/tmux.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -10,5 +10,17 @@ alias tmux-branch='git checkout - && tmux source-file ~/.tmux.conf && echo "Swit
# Quick access to tmux cheatsheet
alias tmux-help="less ~/dotfiles/tmux-cheatsheet.md"

# Copy full tmux pane history (joined lines) to system clipboard
alias tmux-copy-history='tmux capture-pane -p -J -S -999999 | clipboard_copy'
# Copy full history from the current (or last) pane to system clipboard
tmux_copy_history() {
local target_pane

# If we're inside tmux, use the active pane; otherwise fall back to the last active pane
if [ -n "$TMUX" ]; then
target_pane="$(tmux display-message -p '#{pane_id}')"
else
target_pane="$(tmux display-message -p -F '#{pane_id}' -t '{last}')"
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@amazon-q-developer amazon-q-developer bot Dec 4, 2025

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The fallback case for when not inside tmux may fail if no tmux session exists. The tmux display-message command will error if there's no tmux server running, causing the function to fail silently or with an error message.

Suggested change
target_pane="$(tmux display-message -p -F '#{pane_id}' -t '{last}')"
target_pane="$(tmux display-message -p -F '#{pane_id}' -t '{last}' 2>/dev/null)" || { echo "No tmux session found" >&2; return 1; }

fi

tmux capture-pane -p -J -S -999999 -t "${target_pane}" | clipboard_copy
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@amazon-q-developer amazon-q-developer bot Dec 4, 2025

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The function should validate that target_pane is not empty before attempting to capture the pane. If pane detection fails, this will pass an empty string to the -t option, which may cause unexpected behavior.

Suggested change
tmux capture-pane -p -J -S -999999 -t "${target_pane}" | clipboard_copy
if [ -z "$target_pane" ]; then
echo "Failed to determine target pane" >&2
return 1
fi
tmux capture-pane -p -J -S -999999 -t "${target_pane}" | clipboard_copy

}
alias tmux-copy-history='tmux_copy_history'