Implement minor config wizard ergonomics improvements

diff --git a/sqm_lagthrottle_suggest_config.sh b/sqm_lagthrottle_suggest_config.sh
index 0f4aa4e43ad58c5bb1a3a7775441b7a56d4b4f00..747dced0bc03830a6e00f8237a0f94bf0de3cbc1 100755 (executable)
--- a/sqm_lagthrottle_suggest_config.sh
+++ b/sqm_lagthrottle_suggest_config.sh
@@ -19,7 +19,7 @@ TZ=UTC
 LC_ALL=C
 export TZ LC_ALL
 
-for p in sort sleep cat awk tee date fping find head
+for p in sort sleep cat awk tee date fping find head clear
 do
   type "${p}" >/dev/null || { printf 'FATAL: Required program "%s" not installed.\n' "${p}" >&2; exit 1; }
 done
@@ -31,6 +31,14 @@ _goon() {
   printf '\n\n' >&2
 }
 
+_h() {
+  local l
+  l=$(( 60 - ${#1} ))
+  clear
+  printf '=== [ %s ] %'"${l}"'s \n\n' "${1}" "===" >&2
+}
+
+
 fpo="/tmp/fping_${$}.out"
 sto="${fpo}.stats"
 cfgo="./sqm_lagthrottle.conf.$(date +%s)"
@@ -38,7 +46,7 @@ POTENTIAL_PING_PEERS='1.1.1.1 8.8.8.8 a.root-servers.net b.root-servers.net c.ro
 
 set -u
 
-echo "Welcome to the interactive sqm_lagthrottle configuration wizard." >&2
+_h "sqm_lagthrottle configuration wizard - WELCOME"
 echo "" >&2
 printf 'This script will prompt you for a number of settings\n(recommending sensible defaults where thought possible)\nrequired for proper operation of sqm_lagthrottle.\n\nPlease take a few minutes to follow its instructions\nto make the most out of dynamically adjusting your\nbandwidth shaper.\n'
 _goon
@@ -48,6 +56,7 @@ echo "" >&2
 _goon
 
 
+_h "set SQM device (downstream)"
 ifb_dev=$(find /sys/devices/virtual/net/ -name ifb\* -print | head -n 1)
 if [ -e /sys/devices/virtual/net/ifb* ]
 then
@@ -68,7 +77,9 @@ fi
 
 stats_rx="${ifb_dev}"/statistics/tx_bytes
 iface_rx="${ifb_dev%%*/}"
+_goon
 
+_h "set bandwidth limits"
 printf 'Please key in the positive integer LOWER bound (=minimum) bandwidth in Kbps\nfor your downstream Internet connection that you want to shape to: ' >&2
 read bw_down_min
 echo "" >&2
@@ -77,12 +88,14 @@ printf 'Please key in the positive integer UPPER bound (=maximum) bandwidth in K
 read bw_down_max
 echo "" >&2
 
-if ! [ ${bw_down_min} -lt ${bw_down_max} ]
+if ! [ ${bw_down_min}0 -lt ${bw_down_max}0 ]
 then
   printf 'FATAL: Maximum shaping bandwith must be greater than minimum.\n'
   exit 1
 fi
+_goon
 
+_h "configure sqm_lagthrottle behavior"
 printf 'sqm_lagthrottle can be configured to prioritize bandwith over latency,\nor vice versa.\n\nIf you would prefer to keep configured target bandwidth high even in\nthe face of worsening latency/bufferbloat, please key in "bandwith" below.\n\nAll other inputs will lead to a preference for lower latency.\n\n\t'
 read bw_or_lat_bias
 if [ x${bw_or_lat_bias} = xbandwidth ]
@@ -102,10 +115,11 @@ else
   relaxed_or_eager="eager"
 fi
 printf 'Effective choice: [%s]\n\n' "${relaxed_or_eager}"
-echo "" >&2
-echo "" >&2
+_goon
+
+_h "automatic ping peer selection"
 
-printf 'Now, we will ping potential ICMP ECHO peers for a few minutes,\nrecord stats, and determine the top four peer choices.\n\nPlease keep your Internet-directed traffic at a minimum while this is happening!\n' >&2
+printf 'Now, we will ping potential ICMP ECHO peers for a few minutes,\nrecord stats, and determine the top four peer choices.\n\nPlease keep your Internet-directed traffic AT A MINIMUM while\nthis task is active!\n' >&2
 _goon
 
 printf 'Performing pings, please be patient...' >&2