Sync with term-background

rocky · Jun 17, 2024 · a6eeab1 · a6eeab1
1 parent 7ada4de
commit a6eeab1
Showing 1 changed file with 35 additions and 14 deletions.
diff --git a/init/term-background.sh b/init/term-background.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env ksh
 # ^^^^^^^^^^^^ Use env rather ksh installed somewhere
 
-#   Copyright (C) 2019-2020, 2023 Rocky Bernstein <rocky@gnu.org>
+#   Copyright (C) 2019-2020, 2023-2024 Rocky Bernstein <rocky@gnu.org>
 #   This program is free software; you can redistribute it and/or
 #   modify it under the terms of the GNU General Public License as
 #   published by the Free Software Foundation; either version 2, or
@@ -61,12 +61,13 @@ get_default_colorfgbg() {
 is_dark_rgb() {
   typeset fg_r fg_g fg_b
   typeset bg_r bg_g bg_b
-  fg_r=$1
-  fg_g=$2
-  fg_b=$3
-  bg_r=$4
-  bg_g=$5
-  bg_b=$6
+  typeset a_fg a_bg
+  fg_r=${1:-0}
+  fg_g=${2:-0}
+  fg_b=${3:-0}
+  bg_r=${4:-FF}
+  bg_g=${5:-FF}
+  bg_b=${6:-FF}
   a_fg=$((16#"$fg_r" + 16#"$fg_g" + 16#"$fg_b"))
   a_bg=$((16#"$bg_r" + 16#"$bg_g" + 16#"$bg_b"))
   if [[ $a_fg -gt $a_bg ]]; then
@@ -76,6 +77,21 @@ is_dark_rgb() {
   fi
 }
 
+# NOTE: We could have FG=#403020 BG=#203040 and tie
+# On return, variable is_dark_bg is set
+is_dark_rgb_from_bg() {
+  midpoint=32767
+  bg_r=$1
+  bg_g=$2
+  bg_b=$3
+  typeset -i a_bg=$((16#"$bg_r" + 16#"$bg_g" + 16#"$bg_b"))
+  if (( a_bg < midpoint )); then
+    is_dark_bg=1
+  else
+    is_dark_bg=0
+  fi
+}
+
 # Consult (environment) variable COLORFGB
 # On return, variable is_dark_bg is set
 is_dark_colorfgbg() {
@@ -166,11 +182,12 @@ osx_get_terminal_fg_bg() {
     method="COLORFGBG"
     is_dark_colorfgbg
   else
+    # shellcheck disable=SC2207
     RGB_bg=($(osascript -e 'tell application "Terminal" to get the background color of the current settings of the selected tab of front window'))
     retsts=$?
     # typeset -p RGB_bg
     ((retsts != 0)) && return 1
-    is_dark_rgb ${RGB_fg[@]} ${RGB_bg[@]}
+    is_dark_rgb_from_bg "${RGB_bg[@]}"
     method="OSX osascript"
     success=1
   fi
@@ -185,7 +202,7 @@ typeset -i xterm_osc_done=0
 if (( 3711 < VTE_VERSION )) && [[ -z "$COLORFGBG" ]]; then
   # Try Xterm Operating System Command (OSC) (Esc-])
   if xterm_compatible_fg_bg; then
-    is_dark_rgb ${RGB_fg[@]} ${RGB_bg[@]}
+    is_dark_rgb "${RGB_fg[@]}" "${RGB_bg[@]}"
     if [[ $is_dark_bg == 1 ]]; then
       # Even though, we're xterm, assist COLORFGBG
       export COLORFGBG='0;15'
@@ -206,11 +223,11 @@ fi
 
 if ((!success)) && [[ -n $TERM ]]; then
   case $TERM in
-  xterm* | gnome | rxvt*)
+  xterm* | gnome | rxvt* | linux)
     typeset -a RGB_fg RGB_bg
     if [[ $xterm_osc_done -eq 1 ]]; then
       if xterm_compatible_fg_bg; then
-        is_dark_rgb ${RGB_fg[@]} ${RGB_bg[@]}
+        is_dark_rgb "${RGB_fg[@]}" "${RGB_bg[@]}"
       fi
       success=1
     fi
@@ -243,7 +260,7 @@ elif [[ -n $COLORFGBG ]]; then
     ;;
   esac
 else
-  # echo "Can't decide"
+  echo "Can't decide"
   exit_if_not_sourced 1
 fi
 
@@ -254,11 +271,15 @@ if is_sourced; then
     if ((is_dark_bg == 1)); then
       export DARK_BG=1 # deprecated
       export LC_DARK_BG=1
-      [[ -z $COLORFGBG ]] && export COLORFGBG='0;15'
+      if [[ -z "$COLORFGBG" ]]; then
+	  export COLORFGBG='0;15'
+      fi
     else
       export DARK_BG=0
       export LC_DARK_BG=0
-      [[ -z $COLORFGBG ]] && export COLORFGBG='15;0'
+      if [[ -z "$COLORFGBG" ]] ; then
+	  export COLORFGBG='15;0'
+      fi
     fi
   fi
 else