From 82a11c00fe5d443fa0604cf21cc098d932176f5c Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 04 May 2018 12:39:01 -0400
Subject: bin/chdt: Read desktop geometry settings from rc file

---
diff --git a/bin/chdt b/bin/chdt
index a6e1e5d..3a29ae5 100755
--- a/bin/chdt
+++ b/bin/chdt
@@ -2,9 +2,10 @@
 
 set -eu
 
-ROWS=2
-COLS=6
-ORIENTATION='horizontal'
+# Default values, overridden in ~/.chdtrc
+rows=2
+cols=6
+orientation='horizontal'
 
 debug=0
 
@@ -53,22 +54,22 @@ inc_desktop()
 	local dx=${2}
 	local dy=${3}
 
-	case "${ORIENTATION}" in
+	case "${orientation}" in
 		[Hh]*)
-			x=$((${dt} % ${COLS}))
-			y=$((${dt} / ${COLS}))
+			x=$((${dt} % ${cols}))
+			y=$((${dt} / ${cols}))
 			dbg 'Old coordinates: (%d, %d)' ${x} ${y}
-			x=$(((${x} + ${COLS} + ${dx}) % ${COLS}))
-			y=$(((${y} + ${ROWS} + ${dy}) % ${ROWS}))
+			x=$(((${x} + ${cols} + ${dx}) % ${cols}))
+			y=$(((${y} + ${rows} + ${dy}) % ${rows}))
 			dbg 'New coordinates: (%d, %d)' ${x} ${y}
-			dt=$((${y} * ${COLS} + ${x}))
+			dt=$((${y} * ${cols} + ${x}))
 			;;
 		[Vv]*)
-			x=$((${dt} / ${ROWS}))
-			y=$((${dt} % ${ROWS}))
-			x=$(((${x} + ${dx}) % ${COLS}))
-			y=$(((${y} + ${dy}) % ${ROWS}))
-			dt=$((${x} * ${ROWS} + ${y}))
+			x=$((${dt} / ${rows}))
+			y=$((${dt} % ${rows}))
+			x=$(((${x} + ${dx}) % ${cols}))
+			y=$(((${y} + ${dy}) % ${rows}))
+			dt=$((${x} * ${rows} + ${y}))
 			;;
 	esac
 
@@ -162,6 +163,11 @@ main()
 			;;
 	esac
 
+	# POSIX on the dot utility:
+	# "If no readable file is found, a non-interactive shell shall abort"
+	# So to survive an ENOENT or other error, we need this eval/cat command.
+	eval "$(cat ~/.chdtrc 2>/dev/null || :)"
+
 	cur_dt=$(get_desktop) || return 1
 	new_dt=$(inc_desktop ${cur_dt} ${dx} ${dy})
 	case ${move_win} in
--
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