themable prompt and some proposed themes

profile.d/themes/monochrome.theme

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+# Monochrome prompt theme — strict greyscale, no hue at all
+# ------------------------------------------------------------------------------
+# Theme files are NOT executed as shell scripts. load_theme() parses them
+# line by line. Only the following value forms are accepted:
+#
+#   KEY="$ColorVarName"    — reference to a colour variable from disp.sh
+#   KEY="${ColorVarName}"  — same with braces
+#   KEY="\e[...m"          — raw ANSI escape sequence (single block)
+#
+# Accepted keys:
+#   PROMPT_COLOR_*         — prompt slot colours (see profile.conf [prompt])
+#   Standard colour vars   — Black, Blue, On_IBlack, … (overrides the palette
+#                            from disp.sh for the whole shell session)
+#
+# Any unknown key, unsafe value, or shell construct will be ignored with a
+# warning — theme files cannot execute code.
+# ------------------------------------------------------------------------------
+# All hues are silenced — colour variables are remapped to greyscale ANSI
+# codes so that ls, man, grep, etc. also lose their colour cues. Contrast
+# is achieved entirely through brightness: dark grey / light grey / white.
+# Error state uses an inverted (white background, black text) bar so it
+# remains visually distinct without relying on red.
+# ------------------------------------------------------------------------------
+
+# Palette overrides — replace every hue with a grey equivalent
+Red="\e[0;37m"          # light grey
+Green="\e[0;97m"        # bright white (success intent kept as brightest)
+Yellow="\e[0;90m"       # dark grey
+Blue="\e[0;90m"         # dark grey
+Purple="\e[0;37m"       # light grey
+Cyan="\e[0;37m"         # light grey
+BRed="\e[1;37m"         # bold light grey
+BGreen="\e[1;97m"       # bold bright white
+BYellow="\e[1;90m"      # bold dark grey
+BBlue="\e[1;90m"        # bold dark grey
+BPurple="\e[1;37m"      # bold light grey
+BCyan="\e[1;37m"        # bold light grey
+IRed="\e[0;97m"         # bright white
+IGreen="\e[0;97m"       # bright white
+IYellow="\e[0;90m"      # dark grey
+IBlue="\e[0;90m"        # dark grey
+IPurple="\e[0;37m"      # light grey
+ICyan="\e[0;37m"        # light grey
+BIRed="\e[1;97m"        # bold bright white
+BIGreen="\e[1;97m"      # bold bright white
+BIYellow="\e[1;90m"     # bold dark grey
+BIBlue="\e[1;90m"       # bold dark grey
+BIPurple="\e[1;37m"     # bold light grey
+BICyan="\e[1;37m"       # bold light grey
+
+PROMPT_COLOR_TIME_FG="$IBlack"       # dark grey clock text (subtle)
+PROMPT_COLOR_TIME_BG="$On_IBlack"    # dark grey clock background
+PROMPT_COLOR_BAR_BG="$On_IBlack"     # dark grey main bar
+
+PROMPT_COLOR_OK_FG="$IWhite"         # bright white on success
+PROMPT_COLOR_OK_MARK="$BIWhite"      # bold bright white checkmark
+
+PROMPT_COLOR_ERR_BG="$On_White"      # inverted: bright white bar on error
+PROMPT_COLOR_ERR_FG="$Black"         # black text on white background
+PROMPT_COLOR_ERR_MARK="$BBlack"      # bold black X
+
+PROMPT_COLOR_ROOT_FG="$BIWhite"      # bold bright white for root warning
+PROMPT_COLOR_USER_FG="$IWhite"       # bright white for normal user
+PROMPT_COLOR_DIR_FG="$White"         # standard white for path