From 001035a19dc973875475bdce34d57b9bdbc27811 Mon Sep 17 00:00:00 2001
From: John Mertz <git@john.me.tz>
Date: Tue, 24 Sep 2024 16:05:32 -0600
Subject: [PATCH] Support greyscale prompt for eInk terminal profile

---
 alacritty/fedora-eink.toml |  1 +
 bash/prompt.sh             | 68 +++++++++++++++++++++++---------------
 2 files changed, 43 insertions(+), 26 deletions(-)

diff --git a/alacritty/fedora-eink.toml b/alacritty/fedora-eink.toml
index 22f877030..279e5ced2 100644
--- a/alacritty/fedora-eink.toml
+++ b/alacritty/fedora-eink.toml
@@ -26,6 +26,7 @@ foreground = "#000000"
 
 [env]
 TERM_TITLE = "Alacritty (Fedora eInk)"
+TERM_LIGHT = "1"
 
 [font]
 size = 11.0
diff --git a/bash/prompt.sh b/bash/prompt.sh
index 5f3fe0424..a1f70c636 100755
--- a/bash/prompt.sh
+++ b/bash/prompt.sh
@@ -6,26 +6,13 @@ if [[ $1 && $1 != 'h' && $1 != '-h' && $1 != 'help' && $1 != '--help' && $1 != '
     exit
 fi
 
-# Declare the S name (as used by `setterm`) and B for POSIX background colour
-# Reference them later like: ${COLOURS["BLACK","S"]} or ${COLOURS["CYAN","B"]}
-declare -A COLOURS='(
-    [0,S]="default"
-    [0,B]="\[\e[0m\]"
-    [1,S]="red"
-    [1,B]="\[\e[1;30;41m\]"
-    [2,S]="green"
-    [2,B]="\[\e[1;30;42m\]"
-    [3,S]="yellow"
-    [3,B]="\[\e[1;30;43m\]"
-    [4,S]="blue"
-    [4,B]="\[\e[1;30;44m\]"
-    [5,S]="magenta"
-    [5,B]="\[\e[1;30;45m\]"
-    [6,S]="cyan"
-    [6,B]="\[\e[1;30;46m\]"
-    [7,S]="white"
-    [7,B]="\[\e[1;30;47m\]"
-)'
+# Dark mode terminals should have black text on color; light mode has white
+TEXT=0
+BG=3
+if [[ -n $TERM_LIGHT ]]; then
+    TEXT=7
+    BG=4
+fi
 
 # Assign colour to each module
 P="7" # prompt default, white
@@ -39,6 +26,35 @@ B="4" # distrobox
 S="5" # ssh
 D="6" # dir
 G="7" # git
+GS="1" # git sigils
+
+# Declare the S name (as used by `setterm`) and B for POSIX background colour
+# Reference them later like: ${COLOURS["BLACK","S"]} or ${COLOURS["CYAN","B"]}
+declare -A COLOURS='(
+    [0,S]="default"
+    [0,B]="\[\e[0m\]"
+    [1,S]="red"
+    [1,B]="\[\e[1;3${TEXT};41m\]"
+    [2,S]="green"
+    [2,B]="\[\e[1;3${TEXT};42m\]"
+    [3,S]="yellow"
+    [3,B]="\[\e[1;3${TEXT};43m\]"
+    [4,S]="blue"
+    [4,B]="\[\e[1;3${TEXT};44m\]"
+    [5,S]="magenta"
+    [5,B]="\[\e[1;3${TEXT};45m\]"
+    [6,S]="cyan"
+    [6,B]="\[\e[1;3${TEXT};46m\]"
+    [7,S]="white"
+    [7,B]="\[\e[1;30;47m\]"
+)'
+
+if [[ $TEXT != 0 ]]; then
+    COLOURS[7,S]="black"
+    COLOURS[7,B]="\[\e[1;37;40m\]"
+    G=0
+    GS=7
+fi
 
 # If directory was just changed to the root of a git repository, print onefetch
 if [ -n "$DIRCHANGED" ]; then
@@ -83,7 +99,7 @@ esac
 # Get current git branch
 function parse_git_branch() {
     BRANCH=$(git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/')
-    [ ! "${BRANCH}" == "" ] && echo "\[\e[1;31;4${G}m\]$(parse_git_dirty)${COLOURS["$G","B"]}${BRANCH}" || echo ""
+    [ ! "${BRANCH}" == "" ] && echo "\[\e[1;3${GS};4${G}m\]$(parse_git_dirty)\[\e[1;3${TEXT};4${G}m\]${BRANCH}" || echo ""
 }
 
 # Get git status
@@ -115,14 +131,14 @@ LASTB=$P
 if [ -f "/run/.containerenv" ]; then
     H=$B
     [[ $1 ]] && setterm --foreground ${COLOURS[$H,"S"]} && echo "distrobox" && setterm --foreground default
-    PS1="${PS1}\[\e[0;3${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}📦"
+    PS1="${PS1}\[\e[0;${BG}${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}📦"
 elif [[ -z $SSH_CLIENT ]]; then
     [[ $1 ]] && setterm --foreground ${COLOURS[$H,"S"]} && echo "host session" && setterm --foreground default
-    PS1="${PS1}\[\e[0;3${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}🏠"
+    PS1="${PS1}\[\e[0;${BG}${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}🏠"
 else
     H=$S
     [[ $1 ]] && setterm --foreground ${COLOURS[$H,"S"]} && echo "ssh connection" && setterm --foreground default
-    PS1="${PS1}\[\e[0;3${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}🖧 "
+    PS1="${PS1}\[\e[0;${BG}${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}🖧 "
 fi
 LASTB=$H
 
@@ -151,12 +167,12 @@ fi
 # User
 [[ $(whoami) == 'root' ]] && U=$R
 [[ $1 ]] && setterm --foreground ${COLOURS["$U","S"]} && echo "user" && setterm --foreground default
-PS1="${PS1}\[\e[0;3${LASTB};4${U}m\]"${SEP}"${COLOURS["$U","B"]}\\u\[\e[0;30;4${U}m\]@"
+PS1="${PS1}\[\e[0;3${LASTB};4${U}m\]"${SEP}"${COLOURS["$U","B"]}\\u\[\e[0;3${TEXT};4${U}m\]@"
 LASTB=$U
 
 # Host
 [[ $1 ]] && setterm --foreground ${COLOURS["$H","S"]} && echo "hostname" $([[ -z $SSH_TTY ]] || echo " (ssh)") && setterm --foreground default
-PS1="${PS1}\[\e[0;3${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}\\h\[\e[0;30;4${H}m\]:"
+PS1="${PS1}\[\e[0;3${LASTB};4${H}m\]"${SEP}"${COLOURS["$H","B"]}\\h\[\e[0;3${TEXT};4${H}m\]:"
 LASTB=$H
 
 # Dir