terminal: Add fzf file insertion and zoxide cd key binds

The following is added to all three shells bash, zsh, nushell:

Pressing c-t at any time lets you insert a file/dir at the current
cursor location using fzf. Same for 'T' in vicmd mode.

Pressing alt-c at any time lets you jump to that directory using zoxide,
with the zle editor content intact. Same for 'C' in vicmd mode.

Zsh implementation from: https://github.com/ajeetdsouza/zoxide/issues/357
Bash implementation: https://github.com/ajeetdsouza/zoxide/issues/516

Nushell implementation taken from: https://github.com/junegunn/fzf/issues/4122

TODO: Nushell fzf mapping has one problem in that it does not quote the
selected file in any way. So any file with e.g. a space in it will have
to be manually fixed afterwards.

terminal/.config/zsh/.zshrc

@@ -49,6 +49,9 @@ unset PLUG_FOLDER
 # simple fzf-tab settings
 zstyle ":fzf-tab:*" fzf-flags "--ansi" "--expect='$continuous_trigger,$print_query'" "--color=hl:$(($#headers == 0 ? 108 : 255))" "--nth=2,3" "--layout=reverse" "--height=${FZF_TMUX_HEIGHT:-75%}" "--tiebreak=begin" "-m" "--bind=tab:down,btab:up,change:top,ctrl-space:toggle" "--cycle" "--query=$query" "--header-lines=$#headers" "--print-query"
 
+# enable inserting files or dirs using fzf with ctrl-t
+FZF_CTRL_R_COMMAND="" FZF_ALT_C_COMMAND="" source <(fzf --zsh)
+
 zstyle ':fzf-tab:*' fzf-command fzf
 # format colorful groups for different completion actions
 zstyle ':completion:*:descriptions' format '[%d]'
@@ -208,6 +211,29 @@ _fix_cursor() {
 }
 precmd_functions+=(_fix_cursor)
 
+_run-cdi() {
+    local dir="$(eval "zoxide query -i")"
+    if [[ -z "$dir" ]]; then
+        zle redisplay
+        return 0
+    fi
+    zle push-line
+    BUFFER="builtin cd -- ${(q)dir}"
+    zle accept-line
+    local ret=$?
+    unset dir
+    zle reset-prompt
+    return $ret
+}
+zle -N _run-cdi
+
+# use alt-c or C in cmd mode to change dir using zoxide
+bindkey '\ec' _run-cdi
+bindkey -M vicmd 'C' _run-cdi
+# add file insertion with fzf to T in cmd mode (c-t in insert)
+# insert-mode keybind is above, using regular fzf sourcing
+bindkey -M vicmd 'T' fzf-file-widget
+
 # space puts a space, even in cmd mode
 bindkey -a ' ' magic-space
 # always allow backspace/delete to remove letters