Resize script.

1 files changed, 66 insertions, 0 deletions

diff --git a/resize b/resize
new file mode 100755
index 0000000..86cf3db
--- /dev/null
+++ b/resize
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+#!/bin/sh
+
+#
+# resize - script to detect actual terminal window size
+#          and set the appropriate tty kernel params
+#          similarly to the 20+ year old resize program from X11.
+#
+# Kaz Kylheku <kkylheku@gmail.com>
+# October 2006
+#
+
+if [ $# -ne 0 ] ; then
+    echo This is not the X11 resize program, but a shell script imitation.
+    echo It does not process any arguments.
+    exit 1
+fi
+
+# put tty in raw mode
+saved_tty=$(stty -g)
+stty raw isig -echo
+
+# Save cursor position
+printf "\0337" > /dev/tty
+
+# Position the cursor to location 999,999
+printf "\033[999;999H" > /dev/tty
+
+# Query the actual cursor position
+printf "\033[6n" > /dev/tty
+
+# read tty response
+# We use dd to read character by character
+# until encountering the R letter,
+# The response syntax is ESC[<row>;<col>R
+while true; do
+    char=$(dd bs=1 count=1 2> /dev/null)
+    if [ "$char" = "R" ] ; then
+        break;
+    fi
+    tty_response="$tty_response$char"
+done
+
+# Restore cursor position
+printf "\0338" > /dev/tty
+
+# restore tty
+stty $saved_tty
+
+# Set up tty
+set_tty_params()
+{
+    stty rows $2 columns $3
+    cat <<!
+COLUMNS=$3;
+LINES=$2;
+export COLUMNS LINES;
+!
+}
+
+# Trick: use IFS to parse the VT100 response.
+# Since [ ; and R are delimiters, this means
+# that the ESC, <row> and <col> will be
+# extracted as tokens, and passed to the
+# function as $1, $2 and $3.
+IFS='[;R'
+set_tty_params $tty_response