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Fix log-pane for rust-based core-utils #14

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Fix log-pane for rust-based core-utils #14

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41e3c19
Fix log-pane for rust-based core-utils
pantaray Jun 24, 2026
c46f7e4
Included comments in $COMMAND
pantaray Jun 24, 2026
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48 changes: 38 additions & 10 deletions swc-shell-split-window.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -24,19 +24,47 @@ HISTORY_LINES="${HISTORY_LINES:-5}"
# Prompt colour
CYAN="[1;36m"

# If awk supports fflush(), use updated streaming command for log pane
if awk 'BEGIN { printf ""; fflush(); exit 0 }' </dev/null >/dev/null 2>&1; then
COMMAND="\
# * start reading the log
tail -f '${LOG_FILE}' |
awk -v cyan='${CYAN}' '
# * build escape character and reset sequence for printing
BEGIN {
esc = sprintf(\"%c\", 27)
reset = esc \"[0m\"
}
# * ignore lines starting with # since
# they are internal timestamps of the history file
/^#/ { next }
# * colour the line number, then reset colour and print log line,
# then flush so output appears immediately while tailing
{
printf \"%s%s%d%s %s\n\", esc, cyan, NR, reset, \$0
fflush()
}
'"
# Fallback to classic stdbuf method
else
COMMAND="\
# * start reading the log
tail -f '${LOG_FILE}' | \
# * extract the line numbers
stdbuf -o 0 nl -s'%' -n'ln' -w1 | \
# * ignore lines starting with '#' since
# they are the history file's internal timestamps
stdbuf -o 0 grep -v '%#' | \
# * colour the line numbers
awk -F'%' '{print \"\033${CYAN}\"\$1\"\033[0m\",\$2}'"
Comment on lines +52 to +59

@giordano giordano Jun 24, 2026

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Can you keep the comments that were in the previous code? Explaining also what's going on in the code above would nice, too.

@pantaray pantaray Jun 24, 2026

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Good point - comments included in c46f7e4

fi

echo $COMMAND

# Create the session to be used
# * don't attach yet (-d)
# * name it $SESSION (-s "${SESSION}")
tmux new-session -d -s "${SESSION}" "\
# * start reading the log
tail -f '${LOG_FILE}' | \
# * extract the line numbers
stdbuf -o 0 nl -s'%' -n'ln' -w1 | \
# * ignore lines starting with '#' since
# they are the history file's internal timestamps
stdbuf -o 0 grep -v '%#' | \
# * colour the line numbers
awk -F'%' '{print \"\033${CYAN}\"\$1\"\033[0m\",\$2}'"
tmux new-session -d -s "${SESSION}" "${COMMAND}"

# Get the unique (and permanent) ID for the new window
WINDOW=$(tmux list-windows -F '#{window_id}' -t "${SESSION}")
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