help and improvements

src/main.sh

@@ -331,6 +331,13 @@ if [ "${1:-}" = "--help" ]; then
   echo "  --goto                 Interactively enter date to jump to"
   echo "  --day <day>            Show appointments of specified day"
   echo "  --date <date>          Show week of specified date"
+  echo ""
+  echo "You may also start this program with setting locale and timezone"
+  echo "information. For instance, to see and modify all of your calendar"
+  echo "entries from the perspective of Saigon, run"
+  echo "TZ='Asia/Saigon' $0"
+  echo "Likewise, you may specify the usage of Greek with"
+  echo "LC_TIME=el_GR.UTF-8 $0"
   exit
 fi
 
@@ -394,7 +401,7 @@ if [ "${1:-}" = "--day" ]; then
         --ansi \
         --no-sort \
         --no-input \
-        --margin='20%' \
+        --margin='20%,5%' \
         --border='double' \
         --border-label="🗓️ $(date -d "$DISPLAY_DATE" +"%A %e %B %Y")" \
         --color=label:bold:green \
@@ -409,7 +416,10 @@ if [ "${1:-}" = "--day" ]; then
         --bind='ctrl-j:down+hide-preview+transform:echo {} | grep \|\| || echo show-preview' \
         --bind='ctrl-k:up+hide-preview+transform:echo {} | grep \|\| || echo show-preview' \
         --bind="ctrl-s:execute($SYNC_CMD ; printf 'Press <enter> to continue.'; read -r tmp)" \
-        --bind="ctrl-alt-d:become($0 --delete {})"
+        --bind="ctrl-alt-d:become($0 --delete {})" \
+        --bind="j:preview-down" \
+        --bind="k:preview-down" \
+        --bind="w:toggle-preview-wrap"
   )
   key=$(echo "$selection" | head -1)
   line=$(echo "$selection" | tail -1)
@@ -586,15 +596,15 @@ selection=$(
       --tac \
       --no-sort \
       --no-hscroll \
-      --ellipsis='' \
+      --ellipsis="" \
-      --delimiter='|' \
+      --delimiter="|" \
-      --with-nth='{4}' \
+      --with-nth="{4}" \
       --accept-nth=1,2 \
       --ansi \
       --gap 1 \
       --no-scrollbar \
       --info=right \
-      --info-command='printf "Timezone: ${TZ:-as system} (now: $(date))"' \
+      --info-command="printf \"$(date +"%R %Z")\"" \
       --preview-window=up,7,border-bottom \
       --preview="$0 --preview-week {}" \
       --expect="ctrl-n" \