From ff87027cf7278165e28978f67927e9b28133df5c Mon Sep 17 00:00:00 2001
From: "Kenneth Benzie (Benie)" <benie@infektor.net>
Date: Sat, 20 Mar 2021 00:03:20 +0000
Subject: [PATCH] Fix a long standing issue with fresh_almostontop()
Up till now setting the `-a` flag of the `prompt_fresh_setup` theme
resulted in duplicate prompts being printed to the terminal. The first,
the interactive prompt with syntax highlighting, and a second after a
call to the `clear` command without syntax highlighting. This patch
replaces the old implementation with one which does not use `clear`.
Instead it queries the terminal for the current cursor position, then
uses this to move to the bottom of the terminal, print a number of new
lines to move the stale command output off screen, and finally move
almost back to the top ready for the invoked command to print it's
output.
---
prompt_fresh_setup | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/prompt_fresh_setup b/prompt_fresh_setup
index ee0a6cb..47d8db0 100644
--- a/prompt_fresh_setup
+++ b/prompt_fresh_setup
@@ -129,9 +129,27 @@ fresh_line_one() {
}
fresh_almostontop() {
- clear
- fresh_line_one
- print -P "$PROMPT"'$1'
+ # CSI ESC[6n gets the cursor position in the form ESC[<row>;<column>R
+ printf "\033[6n"
+ # Discard prefix delimited by [
+ read -s -d [
+ # Store the <row> delimited by ; in row
+ read -s -d \; row
+ # Discard suffix delimted by R otherwise it is output to the tty
+ read -s -d R
+ # Move the cursor to the bottom of the terminal
+ # CSI ESC[<num>B moves the cursor down <num> lines
+ let "down = $LINES - $row"
+ printf "\033[${down}B"
+ # Print new lines to push the old command out of view
+ let "new = $row - 3"
+ for (( i = 0; i < $new; i++ )); do
+ printf "\n"
+ done
+ # Move the cursor to the line below the prompt
+ # CSI ESC[<num>A moves the cursor up <num> lines
+ let "up = $LINES - 3"
+ printf "\033[${up}A"
}
fresh_compile_git_prompt() {