Add zsh completions for fzf flags

The fzf executable itself did not have any completions.
The colorscheme flags needs further work to get proper completion of all
its options working. Currently it only works to complete the base
scheme.

completions/_fzf

@@ -0,0 +1,133 @@
+#compdef fzf
+
+_fzf () {
+    _arguments -s -S \
+        --version"[Show version of fzf]" \
+        {-h,--help}"[Show list of command-line options]" \
+        {-x,--extended}"[Extended-search mode]" \
+        {+x,--no-extended}"[Disable extended search mode]" \
+        {-e,--exact}"[Enable exact match]" \
+        -i"[Case-insensitive match]" \
+        +i"[Case-sensitive match]" \
+        --literal"[Do not normalize latin script letters for matching]" \
+        --algo="[Fuzzy matching algorithm]:: :__algo" \
+        {-n,--nth}="[Comma-separated list of field index expressions for limiting search scope]" \
+        --with-nth="[Transform the presentation of each line using field index expressions]" \
+       {-d,--delimiter}="[Field delimiter regex for --nth and --with-nth]" \
+        --disabled"[Do not perform search - use fzf as a simple selector interface]" \
+        {+s,--no-sort}"[Do not sort the result]" \
+        --tac"[Reverse the order of the input]" \
+        --tiebreak="[Comma-separated list of sort criteria to apply when the scores are tied]:: :__tiebreak" \
+        {-m,--multi}"[Enable multi-select with tab/shift-tab - optional int to denote max number of selections]" \
+        {+m,--no-multi}"[Disable multi-select]" \
+        --no-mouse"[Disable mouse]" \
+        --bind="[Comma-separated list of custom key bindings]" \
+        --cycle"[Enable cyclic scroll]" \
+        --keep-right"[Keep the right end of the line visible when it's too long]" \
+        --scroll-off="[N screen lines to keep above or below when scrolling to top or bottom]" \
+        --no-hscroll"[Disable horizontal scroll]" \
+        --hscroll-off="[N screen columns to keep to right of highlighted substring]" \
+        --filepath-word"[Make word-wise movements and actions respect path separators]" \
+        --jump-labels="[Label characters for jump and jump-accept]" \
+        --height="[Display fzf window below the cursor with the given height instead of using the full screen.]" \
+        --min-height="[Height of fzf window below cursor - disables full screen]" \
+        --layout="[Choose the layout]:: :__layout" \
+        --reverse"[Synonym for --layout=reverse]" \
+        --border="[Draw border around the finder]:: :__border" \
+        --no-unicode"[Use ASCII instead of Unicode box drawing for border]" \
+        --margin="[Comma-separated expression for margins around the finder.]" \
+        --padding="[Comma-separated expression for padding inside the border. ]" \
+        --info="[Determines the display style of finder info.]:: :__info" \
+        --no-info"[A synonym for --info=hidden]" \
+        --prompt="[Input prompt]" \
+        --pointer="[Pointer to the current line]" \
+        --marker="[Multi-select marker]" \
+        --header="[The given string will be printed as the sticky header]" \
+        --header-lines="[First N lines to treat as sticky header]" \
+        --header-first"[Print header before the prompt line]" \
+        --ellipsis="[Ellipsis to show when line is truncated]" \
+       --ansi"[Enable processing of ANSI color codes]" \
+       --color="[Color configuration - base color scheme name followed by custom color mappings]:: :__color" \
+       --tabstop"[Number of spaces for a tab character]" \
+       --no-bold"[Do not use bold text]" \
+       --black"[Use black background]" \
+       --history="[Load search history from specified file and update file on completion]" \
+       --history-size="[Maximum number of entries in the history file]" \
+       --preview="[Execute given command for the current line and display in preview window]" \
+       --preview-window="[Determines the layout of the preview window]" \
+       {-q,--query}="[Start the finder with the given query]" \
+       {-1,--select-1}"[Select without interactive finder if only one match for --query found]" \
+       {-0,--exit-0}"[Exit without interactive finder if there is no match for --query]" \
+       {-f,--filter}="[Filter by string without interactive finder]" \
+       --print-query"[Print query as the first line]" \
+       --expect="[Comma-separated key list to complete fzf apart from enter key]" \
+       --read0"[Read input delimited by ASCII NUL characters instead of newline characters]" \
+       --print0"[Print output delimited by ASCII NUL characters instead of newline characters]" \
+       --no-clear"[Do not clear finder interface on exit]" \
+       --bind="[Takes a comma-separated list of binding expressions]" \
+       "*:filename:_files"
+}
+
+__algo() {
+    algorithms=(
+        'v2:Optimal scoring (quality)'
+        'v1:Faster but not quaranteed to find the optimal result'
+    )
+    _describe -t algorithms 'algo' algorithms
+}
+
+__tiebreak() {
+    criteria=(
+        'length:Prefers line with shorter length'
+        'begin:Prefers line with matched substring closer to the beginning'
+        'end:Prefers line with matched substring closer to the end'
+        'index:Prefers line that appeared earlier in the input stream'
+    )
+    _describe -t criteria 'criterion' criteria
+}
+
+__color() {
+    colorschemes=(
+        "dark:Color scheme for dark 256-color terminal"
+        "light:Color scheme for light 256-color terminal"
+        "16:Color scheme for 16-color terminal"
+        "bw:No colors (equivalent to --no-color)"
+    )
+
+    _describe -t colorschemes 'colorscheme' colorschemes
+}
+
+__layout() {
+    layouts=(
+        'default:Display from the bottom of the screen'
+        'reverse:Display from the top of the screen'
+        'reverse-list:Display from the top of the screen, prompt at the bottom'
+        )
+    _describe -t layouts 'layout' layouts
+}
+
+__border() {
+    styles=(
+        'rounded:Border with rounded corners (default)'
+        'sharp:Border with sharp corners'
+        'horizontal:Horizontal lines above and below the finder'
+        'vertical:Vertical lines on each side of the finder'
+        'top'
+        'bottom'
+        'left'
+        'right'
+        'none'
+    )
+    _describe -t styles 'style' styles
+}
+
+__info() {
+    styles=(
+        'default:Display on the next line to the prompt'
+        'inline:Display on the same line'
+        'hidden:Do not display finder info'
+    )
+    _describe -t styles 'style' styles
+}
+
+__fzf