* usr/bin/byobu-status, usr/lib/byobu/battery, usr/lib/byobu/cpu_freq,

usr/lib/byobu/custom, usr/lib/byobu/disk, usr/lib/byobu/disk_io,
  usr/lib/byobu/distro, usr/lib/byobu/ec2_cost, usr/lib/byobu/entropy,
  usr/lib/byobu/fan_speed, usr/lib/byobu/hostname,
  usr/lib/byobu/load_average, usr/lib/byobu/memory,
  usr/lib/byobu/network, usr/lib/byobu/processes, usr/lib/byobu/raid,
  usr/lib/byobu/rcs_cost, usr/lib/byobu/swap, usr/lib/byobu/uptime,
  usr/lib/byobu/wifi_quality:
  - help ensure that a status is printed
  - this fixes byobu status on some slower systems
  - use the last cached status, if the current one doesn't return

debian/changelog

@@ -1,6 +1,16 @@
 byobu (5.14) unreleased; urgency=low
 
-  * UNRELEASED
+  * usr/bin/byobu-status, usr/lib/byobu/battery, usr/lib/byobu/cpu_freq,
+    usr/lib/byobu/custom, usr/lib/byobu/disk, usr/lib/byobu/disk_io,
+    usr/lib/byobu/distro, usr/lib/byobu/ec2_cost, usr/lib/byobu/entropy,
+    usr/lib/byobu/fan_speed, usr/lib/byobu/hostname,
+    usr/lib/byobu/load_average, usr/lib/byobu/memory,
+    usr/lib/byobu/network, usr/lib/byobu/processes, usr/lib/byobu/raid,
+    usr/lib/byobu/rcs_cost, usr/lib/byobu/swap, usr/lib/byobu/uptime,
+    usr/lib/byobu/wifi_quality:
+    - help ensure that a status is printed
+    - this fixes byobu status on some slower systems
+    - use the last cached status, if the current one doesn't return
 
  -- Dustin Kirkland <kirkland@ubuntu.com>  Tue, 21 Feb 2012 23:22:38 -0600
 

usr/bin/byobu-status

@@ -34,22 +34,27 @@ for i in "${BYOBU_PREFIX}/share/$PKG/status/status" "${BYOBU_PREFIX}/share/$PKG/
 	[ -r "$i" ] && . "$i"
 done
 
-# Reload profile, if necessary
-if [ -e "/var/run/screen/S-$USER/$PKG.reload-required" ] || [ -e "$BYOBU_RUN_DIR/reload-required" ]; then
-	if [ "$BYOBU_BACKEND" = "screen" ] && [ -r "$BYOBU_CONFIG_DIR/profile" ]; then
-		# If the forced janitorial steps succeed, try a profile reload
-		byobu-janitor --force && screen -X at 0 source "$BYOBU_CONFIG_DIR/profile" >/dev/null 2>&1
-	fi
-fi
-
-# Do first-run procedures, if necessary
-if [ -n "$TMUX" ]; then
-	if [ ! -e "$BYOBU_RUN_DIR/${TMUX#*,}" ]; then
-		# Clear initial window name
-		tmux rename-window ""
-		touch "$BYOBU_RUN_DIR/${TMUX#*,}"
-	fi
-fi
+case "$BYOBU_BACKEND" in
+	screen)
+		# Reload profile, if necessary
+		if [ -e "/var/run/screen/S-$USER/$PKG.reload-required" ] || [ -e "$BYOBU_RUN_DIR/reload-required" ]; then
+			if [ -r "$BYOBU_CONFIG_DIR/profile" ]; then
+				# If the forced janitorial steps succeed, try a profile reload
+				byobu-janitor --force && screen -X at 0 source "$BYOBU_CONFIG_DIR/profile" >/dev/null 2>&1
+			fi
+		fi
+	;;
+	tmux)
+		# Do first-run procedures, if necessary
+		if [ -n "$TMUX" ]; then
+			if [ ! -e "$BYOBU_RUN_DIR/${TMUX#*,}" ]; then
+				# Clear initial window name
+				tmux rename-window ""
+				touch "$BYOBU_RUN_DIR/${TMUX#*,}"
+			fi
+		fi
+	;;
+esac
 
 # Get the current timestamp
 get_now; NOW=${_RET}
@@ -77,10 +82,16 @@ get_status() {
 	find_script "$function" && . "${_RET}"
 	# Update cache now, if necessary
 	if [ $NOW -ge $expiry ] || [ "$lastrun" = "0" ]; then
-		"__$function" > "$cachepath"
-		printf "%s" "$NOW" > "$lastpath"
+		"__$function" > "$cachepath".new
 	fi
-	if [ -s "$cachepath" ]; then
+	# Check if we have data in the cache
+	if [ -s "$cachepath".new ]; then
+		# Looks like we have an updated cache, use it
+		mv -f "$cachepath".new "$cachepath"
+		printf "%s" "$NOW" > "$lastpath"
+		IFS= read line < "$cachepath"; printf "%s" "$line"
+	elif [ -s "$cachepath" ]; then
+		# New cache is empty, but we have data from our last run, use it
 		IFS= read line < "$cachepath"; printf "%s" "$line"
 	fi
 }

usr/lib/byobu/battery

@@ -88,6 +88,7 @@ __battery() {
 			charged|Unknown|Full) sign="="; percent="" ;;
 			*) sign="$state" ;;
 		esac
+		[ -n "$percent" ] || return
 		color $bcolor; printf "%s" "$percent"; color -; color $color; printf "%s" "$sign"; color --
 	fi
 }

usr/lib/byobu/cpu_freq

@@ -39,6 +39,7 @@ __cpu_freq() {
 			freq=$(printf "%s %s" "$freq" "$count" | awk '{printf "%01.1f\n", $1/$2/1000}')
 		fi
 	fi
+	[ -n "$freq" ] || return
 	color b c W; printf "%s" "$freq"; color -; color c W; printf "%s" "$ICON_GHz"; color --
 }
 

usr/lib/byobu/custom

@@ -53,6 +53,7 @@ __custom() {
 			;;
 		esac
 	done
+	[ -n "$output" ] || return
 	printf "$output" | $BYOBU_SED ':a;N;$!ba;s/\n//g'
 }
 

usr/lib/byobu/disk

@@ -44,6 +44,7 @@ __disk() {
 		g*|G*) unit="$ICON_GB" ;;
 		t*|T*) unit="$ICON_TB" ;;
 	esac
+	[ -n "$size" ] || return
 	color b M W; printf "%s" "$size"; color -; color M W; printf "%s" "$unit"; color -;
 	color b M W; printf "%s" "$pct";  color -; color M W; printf "%s" "$PCT"; color --;
 }

usr/lib/byobu/disk_io

@@ -90,7 +90,8 @@ __disk_io() {
 				unit="kB/s"
 			fi
 		fi
-		[ "$rate" != "0" ] || continue
+		[ -z "$rate" ] && continue
+		[ "$rate" = "0" ] && continue
 		color b M W; printf "%s%s" "$symbol" "$rate"; color -; color M W; printf "%s" "$unit"; color --
 	done
 }

usr/lib/byobu/distro

@@ -61,6 +61,7 @@ __distro() {
 	else
 		DISTRO="Byobu"
 	fi
+	[ -n "$DISTRO" ] || return
 	color bold2; printf "%s" "$DISTRO"; color --
 }
 

usr/lib/byobu/ec2_cost

@@ -118,6 +118,7 @@ __ec2_cost() {
 		echo "================================================"
 		return
 	fi
+	[ -n "$total_cost" ] || return
 	color K G; printf "A\$"; color -; color b K G; printf "%s" "$total_cost"; color --
 }
 

usr/lib/byobu/entropy

@@ -24,6 +24,7 @@ __entropy_detail() {
 
 __entropy() {
 	local e=$(cat /proc/sys/kernel/random/entropy_avail)
+	[ -n "$e" ] || return
 	color K Y; printf "e%s" "$e"; color --
 }
 

usr/lib/byobu/fan_speed

@@ -31,7 +31,7 @@ __fan_speed() {
 	for i in $FAN /sys/class/hwmon/*/*/fan1_input /sys/class/hwmon/*/device/hwmon/*/fan1_input; do
 		[ -f "$i" ] || continue
 		read speed < "$i"
-		if [ "$speed" -gt 0 ]; then
+		if [ -n "$speed" ] && [ "$speed" -gt 0 ]; then
 			color bold1; printf "%s" "$speed"; color -; color none; printf "rpm"; color --
 			return 0
 		fi
@@ -43,7 +43,7 @@ __fan_speed() {
 		read line < /proc/i8k
 		set -- $line
 		for speed in $7 $8; do
-			if [ "$speed" -gt 0 ]; then
+			if [ -n "$speed" ] && [ "$speed" -gt 0 ]; then
 				# I8K_FAN_MULT defaults to 30 (buggy BIOS workaround?),
 				# use `modprobe i8k fan_mult=1` to disable if unneeded,
 				# resulting in nonsensical speeds

usr/lib/byobu/hostname

@@ -34,6 +34,7 @@ __hostname() {
 	else
 		h=$(hostname -s 2>/dev/null || hostname)
 	fi
+	[ -n "$h" ] || return
 	color bold2; printf "%s" "$h"; color --
 }
 

usr/lib/byobu/load_average

@@ -25,6 +25,7 @@ __load_average_detail() {
 
 __load_average() {
 	read one five fifteen other < /proc/loadavg
+	[ -n "$one" ] || return
 	color Y k; printf "$one"; color --
 }
 

usr/lib/byobu/memory

@@ -53,6 +53,7 @@ __memory() {
 	else
 		unit="$ICON_KB"
 	fi
+	[ -n "$total" ] || return
 	color b g W; printf "%s" "$total"; color -; color g W; printf "%s" "$unit"; color -; color b g W; printf "%s" "$f"; color -; color g W; printf "%s" "$PCT"; color --
 }
 

usr/lib/byobu/network

@@ -87,6 +87,7 @@ __network() {
 					fi
 				;;
 			esac
+			[ -n "$rate" ] || continue
 			color b m w; printf "%s%s" "$symbol" "$rate"; color -; color m w; printf "%s" "$unit"; color --
 		fi
 	done

usr/lib/byobu/processes

@@ -25,6 +25,7 @@ __processes_detail() {
 
 __processes() {
 	local count=$(ls -d /proc/[0-9]* 2>/dev/null| wc -l)
+	[ -n "$count" ] || return
 	color b y w; printf "%s" "$count"; color -; color y w; printf "&"; color --
 }
 

usr/lib/byobu/raid

@@ -36,9 +36,8 @@ __raid() {
 				msg="$msg,$p";;
 		esac
 	done < /proc/mdstat
-	if [ -n "$msg" ]; then
-		color B w r; printf "%s" "$msg"; color --
-	fi
+	[ -n "$msg" ] || return
+	color B w r; printf "%s" "$msg"; color --
 }
 
 # vi: syntax=sh ts=4 noexpandtab

usr/lib/byobu/rcs_cost

@@ -91,6 +91,7 @@ __rcs_cost() {
 		return
 	fi
 
+	[ -n "$total_cost" ] || return
 	color K G; printf "R\$%s"; color -; color b K G; printf "%s" "$total_cost"; color --
 }
 

usr/lib/byobu/swap

@@ -50,6 +50,7 @@ __swap() {
 		mem="$mem"
 		unit="$ICON_KB"
 	fi
+	[ -n "$mem" ] || return
 	color b G W; printf "s%s" "$mem"; color -; color G W; printf "%s" "$unit"; color -;
 	color b G W; printf "%s" "$f"; color -; color G W; printf "%s" "$PCT"; color --
 }

usr/lib/byobu/uptime

@@ -38,6 +38,7 @@ __uptime() {
 	else
 		str="${u}s"
 	fi
+	[ -n "$str" ] || return
 	color w b; printf "%s" "${str}"; color --
 }
 

usr/lib/byobu/wifi_quality

@@ -40,6 +40,7 @@ __wifi_quality() {
 	if [ -z "$quality" ] || [ "$quality" = "0" ]; then
 		quality="0"
 	fi
+	[ -n "$quality" ] || return
 	[ "$quality" = "0" ] && return
 	printf "${ICON_WIFI}"; color b C k; printf "%s" "$bitrate"; color -; color C k; printf "%s" "$ICON_MBPS"; color -; color b C k; printf "%s" "$quality"; color -; color C k; printf "%s" "$PCT"; color --
 }