neomutt: Update message index colors

We have differentiated views of new (italic) and unread (underline, and
a bit of highlight on the author) messages.

Additionally the indicator highlighting works better with the rest of
the colors, and we have a better paperclip icon icon for attachments.

office/.config/neomutt/colors

@@ -5,36 +5,6 @@ color header brightmagenta default "^(From)"
 color header brightcyan default "^(Subject)"
 color header brightwhite default "^(CC|BCC)"
 
-# mono bold bold
-# mono underline underline
-# mono indicator reverse
-# mono error bold
-# color normal default default
-# color indicator brightyellow default # currently selected message. default makes bar clear, disabled arrow to save space.
-# color sidebar_highlight red default
-# color sidebar_divider brightblack black
-# color sidebar_flagged red black
-# color sidebar_new green black
-# color normal brightyellow default
-# color error red default
-# color tilde black default
-# color message cyan default
-# color markers red white
-# color attachment white default
-# color search brightmagenta default
-# color status brightyellow black
-# color hdrdefault brightgreen default
-# color quoted green default
-# color quoted1 blue default
-# color quoted2 cyan default
-# color quoted3 yellow default
-# color quoted4 red default
-# color quoted5 brightred default
-# color signature brightgreen default
-# color bold black default
-# color underline black default
-# color normal default default
-
 color body brightred default "[\-\.+_a-zA-Z0-9]+@[\-\.a-zA-Z0-9]+" # Email addresses
 color body brightblue default "(https?|ftp)://[\-\.,/%~_:?&=\#a-zA-Z0-9]+" # URL
 color body green default "\`[^\`]*\`" # Green text between ` and `
@@ -56,15 +26,20 @@ mono body bold "^gpg: BAD signature from.*"
 color body red default "([a-z][a-z0-9+-]*://(((([a-z0-9_.!~*'();:&=+$,-]|%[0-9a-f][0-9a-f])*@)?((([a-z0-9]([a-z0-9-]*[a-z0-9])?)\\.)*([a-z]([a-z0-9-]*[a-z0-9])?)\\.?|[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+)(:[0-9]+)?)|([a-z0-9_.!~*'()$,;:@&=+-]|%[0-9a-f][0-9a-f])+)(/([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*(;([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*)*(/([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*(;([a-z0-9_.!~*'():@&=+$,-]|%[0-9a-f][0-9a-f])*)*)*)?(\\?([a-z0-9_.!~*'();/?:@&=+$,-]|%[0-9a-f][0-9a-f])*)?(#([a-z0-9_.!~*'();/?:@&=+$,-]|%[0-9a-f][0-9a-f])*)?|(www|ftp)\\.(([a-z0-9]([a-z0-9-]*[a-z0-9])?)\\.)*([a-z]([a-z0-9-]*[a-z0-9])?)\\.?(:[0-9]+)?(/([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*(;([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*)*(/([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*(;([-a-z0-9_.!~*'():@&=+$,]|%[0-9a-f][0-9a-f])*)*)*)?(\\?([-a-z0-9_.!~*'();/?:@&=+$,]|%[0-9a-f][0-9a-f])*)?(#([-a-z0-9_.!~*'();/?:@&=+$,]|%[0-9a-f][0-9a-f])*)?)[^].,:;!)? \t\r\n<>\"]"
 
 # Default index colors:
-color index yellow default '.*'
-color index_author red default '.*'
-color index_number blue default
-color index_subject cyan default '.*'
+color index yellow default "~A"
+color index_author magenta default "~A"
+color index_number blue default "~A"
+color index_subject cyan default "~A"
 
-# For new mail:
-color index brightyellow brightblack "~N"
-color index_author brightred brightblack "~N"
-color index_subject brightcyan black "~N"
+# For new mail (i.e. arrived after last time neomutt was open):
+color index brightyellow default "~N"
+color index_author bold italic brightred default "~N"
+color index_subject bold italic brightcyan default "~N"
+
+# For unread mail:
+color index brightyellow default "~U"
+color index_author bold brightmagenta brightblack "~U"
+color index_subject underline brightcyan default "~U"
 
 color progress black cyan
 # Nerd icons idea based on https://github.com/sheoak/neomutt-powerline-nerdfonts/
@@ -73,13 +48,12 @@ color progress black cyan
 
 # Formatting   ----------------------------------------------------------------------
 set date_format = "%a %d %h %H:%M"
-set index_format="  %zc %zs %zt  | %-35.35L   %?X?📎& ? %M %-30.100s %> %?Y?%Y ? %(!%a %d %h %H:%M)  "
+set index_format="  %zc %zs %zt  | %-35.35L   %?X?& ? %M %-30.100s %> %?Y?%Y ? %(!%a %d %h %H:%M)  "
 set pager_format="%n %T %s%*  %{!%d %b · %H:%M} %?X? %X?%P"
 set status_format = " %D %?u? %u ?%?R? %R ?%?d? %d ?%?t? %t ?%?F? %F ?%?p? %p? \n  \n"
 set compose_format="-- NeoMutt: Compose  [Approx. msg size: %l   Atts: %a]%>-"
 # set vfolder_format = "%N %?n?%3n&   ?  %8m  · %f"
 set attach_format = "%u%D  %T %-75.20d %T  %5s %m/%M"
-set sidebar_format = '%D%?Z? [%Z]?%* %?S?%S?'
 set sidebar_format = '%B%<F? [%F]>%* %<Z?%Z/>%S'
 index-format-hook attachment_info '=B text/calendar ~X 1' ' '
 index-format-hook attachment_info '=B text/calendar' "  "
@@ -127,7 +101,7 @@ color index color3 default '~T'                 # tagged messages
 color index color3 default '~T~N'               # tagged messages (new)
 color index color11 default '~T~R'              # tagged messages (read)
 color tree  color8 color8                       # thread tree lines/arrow
-color indicator default color8                  # selection indicator
+color indicator black cyan                  # selection indicator
 color index_date color8 default                 # date is always the same colour
 color index_label color6 default                # label is always the same colour