From 41e3c19e473b9d8adc1159eebf7c7bc28609a21b Mon Sep 17 00:00:00 2001
From: Stefan Fuertinger <stefan.fuertinger@esi-frankfurt.de>
Date: Wed, 24 Jun 2026 14:51:19 +0200
Subject: [PATCH 1/2] Fix log-pane for rust-based core-utils

Buffering via stdbuf only works with C code using stdio; modern
Ubuntu (25.10+) uses a re-write of the core-utils in rust, which
stdbuf has no effect on. Updated the log-pane setup to instead
rely solely on awk and its built-in fflush() function
---
 swc-shell-split-window.sh | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/swc-shell-split-window.sh b/swc-shell-split-window.sh
index b1d3c58..62f939c 100755
--- a/swc-shell-split-window.sh
+++ b/swc-shell-split-window.sh
@@ -24,19 +24,36 @@ 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="\
+        tail -f '${LOG_FILE}' |
+        awk -v cyan='${CYAN}' '
+          BEGIN {
+            esc = sprintf(\"%c\", 27)
+            reset = esc \"[0m\"
+          }
+
+          /^#/ { next }
+
+          {
+            printf \"%s%s%d%s %s\n\", esc, cyan, NR, reset, \$0
+            fflush()
+          }
+        '"
+# Fallback to classic stdbuf method
+else
+    COMMAND="\
+        tail -f '${LOG_FILE}' | \
+        stdbuf -o 0 nl -s'%' -n'ln' -w1 | \
+        stdbuf -o0  grep -v '%#' | \
+        awk -F'%' '{print \"\033${CYAN}\"\$1\"\033[0m\",\$2}'"
+fi
+
 # 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}")

From c46f7e4015466d6fef29a66b34c7d8c7f53cfbcf Mon Sep 17 00:00:00 2001
From: Stefan Fuertinger <stefan.fuertinger@esi-frankfurt.de>
Date: Wed, 24 Jun 2026 16:13:25 +0200
Subject: [PATCH 2/2] Included comments in $COMMAND

On branch master
Changes to be committed:
	modified:   swc-shell-split-window.sh
---
 swc-shell-split-window.sh | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/swc-shell-split-window.sh b/swc-shell-split-window.sh
index 62f939c..242a39b 100755
--- a/swc-shell-split-window.sh
+++ b/swc-shell-split-window.sh
@@ -27,15 +27,19 @@ 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()
@@ -44,12 +48,19 @@ if awk 'BEGIN { printf ""; fflush(); exit 0 }' </dev/null >/dev/null 2>&1; then
 # Fallback to classic stdbuf method
 else
     COMMAND="\
+        # * start reading the log
         tail -f '${LOG_FILE}' | \
+        # * extract the line numbers
         stdbuf -o 0 nl -s'%' -n'ln' -w1 | \
-        stdbuf -o0  grep -v '%#' | \
+        # * ignore lines starting with '#' since
+        #   they are the history file's internal timestamps
+        stdbuf -o 0  grep -v '%#' | \
+        # * colour the line numbers
         awk -F'%' '{print \"\033${CYAN}\"\$1\"\033[0m\",\$2}'"
 fi
 
+echo $COMMAND
+
 # Create the session to be used
 # * don't attach yet (-d)
 # * name it $SESSION (-s "${SESSION}")