From 31afd5e3580cf158984884404b4c38fd8f97e9f4 Mon Sep 17 00:00:00 2001
From: Connor Olding <cloningdonor@gmail.com>
Date: Tue, 2 Apr 2024 22:22:51 -0700
Subject: [PATCH] overengineer zsh and bash prompts

---
 home/bashrc | 42 ++++++++++++++++++++++++++++++++++--------
 home/zshrc  | 12 +++++++-----
 2 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/home/bashrc b/home/bashrc
index ca0ced8..290a2b8 100644
--- a/home/bashrc
+++ b/home/bashrc
@@ -15,19 +15,45 @@ set +o histexpand # disable expansion of ! characters
 
 _temporary_scope_() {
     local t="${TERM%%-*}" title=
+
+    local ESC="\\E"
+    local BEL="\\a"
+    local SI="\\017" # switch to G0 charset
+    local SO="\\016" # switch to G1 charset
+
+    local CSI="$ESC["
+    local OSC="$ESC]"
+
     if [ "$t" = xterm ] || [ "$t" = screen ] || [ "$t" = tmux ]; then
-        title='\[\033]2;\w\a\]'
+        title="\\\\w"
+        [ "$t" = tmux ] || title="\\\\H: $title"
+        title="${OSC}2;$title$BEL"
     fi
 
-    local color_okay='\\[\e[42m\\]'
-    local color_fail='\\[\e[41m\\]'
-    local line1=' \\[\e[0m\\]'
-    local line2='\\[\e[1;37m\\]\\$\\[\e[0m\\] '
-    local ret_okay="$title$color_okay$line1\n$color_okay$line2"
-    local ret_fail="$title$color_fail$line1\n$color_fail$line2"
+    local G0="(" # change G0 charset
+    local G1=")" # change G1 charset
+    local USASCII="B" # sane default
+    local SPECIAL="0" # DEC Special Character and Line Drawing Set
+
+    local DECTCEM="25"
+    local DECSET="h"
+    local SGR="m"
+
+    local sanity="$ESC$G0$USASCII$SI$CSI?$DECTCEM$DECSET"
+    local hide="\\\\["
+    local show="\\\\]"
+    local prompt="\\\\$"
+    local reset="$hide$CSI$SGR$show"
+    local color1="$CSI;--$SGR"
+    local color2="$CSI--;97$SGR"
+    local line1="$hide$title$sanity$color1$show $reset"
+    local line2="$hide$color2$show$prompt$reset "
+    local ret="$line1\\n$line2"
+    local ret_okay="${ret//--/42}" # use green background
+    local ret_fail="${ret//--/41}" # use red background
 
     PROMPT_COMMAND="[ \$? = 0 ] && PS1=\$'$ret_okay' || PS1=\$'$ret_fail'"
-}; _temporary_scope_; unset _temporary_scope_
+}; _temporary_scope_; unset -f _temporary_scope_
 
 . ~/.shrc
 
diff --git a/home/zshrc b/home/zshrc
index 92a346e..e98e06a 100644
--- a/home/zshrc
+++ b/home/zshrc
@@ -234,9 +234,12 @@ function {
     # zsh adds a % symbol to newline-less output, so my bash prompt is overkill
     # NOTE: i've started hardcoding escapes instead of relying on zsh
     #       because detecting terminal features is too troublesome.
-    local s=$'\x1B\x5B' # start escape code
-    local e=m           #   end escape code
-    local reset="${s}0${e}"
+    # https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Functions-using-CSI-_-ordered-by-the-final-character_s_
+    local chset=$'\033\050B\017' # set G0 to USASCII charset and "shift-in" to it
+    local s=$'\033\133' # CSI
+    local e=m           # SGR
+    local reset=$s$e
+    local curse=$s$'?25h' # show cursor (DECTCEM)
     local good=42 # green
     local  bad=41 # red
 
@@ -247,8 +250,7 @@ function {
     (sabotage)   good=45;; # magenta
     esac
 
-    # NOTE: i had ${s}10${e} here before, is it still necessary?
-    PROMPT="%{$reset${s}%(?.${good}.${bad})${e}${s}97${e}%}%#%{$reset%} "
+    PROMPT="%{$chset$curse$reset$s%(?.$good.$bad);97$e%}%#%{$reset%} "
 }
 
 reload() { ### @-