[bash] bring fzf’s own bash completion up to date

This orders and groups completed options and values in just as they appear in
the code respectively, for some option values, as they’d be printed in the
`--help`-output.

It does not add support for completion of `:` right after values that support an
optional `:some-further-value` postfix.
Neither does it add support for the `--option=value`-style.

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>

shell/completion.bash

@@ -69,55 +69,185 @@ _fzf_opts_completion() {
   cur="${COMP_WORDS[COMP_CWORD]}"
   prev="${COMP_WORDS[COMP_CWORD-1]}"
   opts="
+    -h --help
     -x --extended
     -e --exact
+    --extended-exact
+    +x --no-extended
+    +e --no-exact
+    -q --query
+    -f --filter
+    --literal
+    --no-literal
     --algo
-    -i +i
+    --scheme
+    --expect
+    --no-expect
+    --enabled --no-phony
+    --disabled --phony
+    --tiebreak
+    --bind
+    --color
+    --toggle-sort
+    -d --delimiter
     -n --nth
     --with-nth
-    -d --delimiter
+    -s --sort
     +s --no-sort
+    --track
+    --no-track
     --tac
-    --tiebreak
+    --no-tac
+    -i
+    +i
     -m --multi
+    +m --no-multi
+    --ansi
+    --no-ansi
     --no-mouse
-    --bind
+    +c --no-color
+    +2 --no-256
+    --black
+    --no-black
+    --bold
+    --no-bold
+    --layout
+    --reverse
+    --no-reverse
     --cycle
+    --no-cycle
+    --keep-right
+    --no-keep-right
+    --hscroll
     --no-hscroll
-    --jump-labels
-    --height
-    --literal
-    --reverse
-    --margin
+    --hscroll-off
+    --scroll-off
+    --filepath-word
+    --no-filepath-word
+    --info
+    --no-info
     --inline-info
+    --no-inline-info
+    --separator
+    --no-separator
+    --scrollbar
+    --no-scrollbar
+    --jump-labels
+    -1 --select-1
+    +1 --no-select-1
+    -0 --exit-0
+    +0 --no-exit-0
+    --read0
+    --no-read0
+    --print0
+    --no-print0
+    --print-query
+    --no-print-query
     --prompt
     --pointer
     --marker
-    --header
-    --header-lines
-    --ansi
-    --tabstop
-    --color
-    --no-bold
+    --sync
+    --no-sync
+    --async
+    --no-history
     --history
     --history-size
+    --no-header
+    --no-header-lines
+    --header
+    --header-lines
+    --header-first
+    --no-header-first
+    --ellipsis
     --preview
+    --no-preview
     --preview-window
-    -q --query
-    -1 --select-1
-    -0 --exit-0
-    -f --filter
-    --print-query
-    --expect
-    --sync"
+    --height
+    --min-height
+    --no-height
+    --no-margin
+    --no-padding
+    --no-border
+    --border
+    --no-border-label
+    --border-label
+    --border-label-pos
+    --no-preview-label
+    --preview-label
+    --preview-label-pos
+    --no-unicode
+    --unicode
+    --margin
+    --padding
+    --tabstop
+    --listen
+    --no-listen
+    --clear
+    --no-clear
+    --version
+    --"
 
   case "${prev}" in
+  --algo)
+    COMPREPLY=( $(compgen -W "v1 v2" -- "$cur") )
+    return 0
+    ;;
+  --scheme)
+    COMPREPLY=( $(compgen -W "default path history" -- "$cur") )
+    return 0
+    ;;
   --tiebreak)
-    COMPREPLY=( $(compgen -W "length begin end index" -- "$cur") )
+    COMPREPLY=( $(compgen -W "length chunk begin end index" -- "$cur") )
     return 0
     ;;
   --color)
-    COMPREPLY=( $(compgen -W "dark light 16 bw" -- "$cur") )
+    COMPREPLY=( $(compgen -W "dark light 16 bw no" -- "$cur") )
+    return 0
+    ;;
+  --layout)
+    COMPREPLY=( $(compgen -W "default reverse reverse-list" -- "$cur") )
+    return 0
+    ;;
+  --info)
+    COMPREPLY=( $(compgen -W "default right hidden inline inline-right" -- "$cur") )
+    return 0
+    ;;
+  --preview-window)
+    COMPREPLY=( $(compgen -W "
+      default
+      hidden
+      nohidden
+      wrap
+      nowrap
+      cycle
+      nocycle
+      up top
+      down bottom
+      left
+      right
+      rounded border border-rounded
+      sharp border-sharp
+      border-bold
+      border-block
+      border-thinblock
+      border-double
+      noborder border-none
+      border-horizontal
+      border-vertical
+      border-up border-top
+      border-down border-bottom
+      border-left
+      border-right
+      follow
+      nofollow" -- "$cur") )
+    return 0
+    ;;
+  --border)
+    COMPREPLY=( $(compgen -W "rounded sharp bold block thinblock double horizontal vertical top bottom left right none" -- "$cur") )
+    return 0
+    ;;
+  --border-label-pos|--preview-label-pos)
+    COMPREPLY=( $(compgen -W "center bottom top" -- "$cur") )
     return 0
     ;;
   --history)