feat: add fish variables and fish key bindings

files/fish/fish_key_bindings

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+set -l init_mode insert
+
+if contains -- $argv[1] insert default visual
+    set init_mode $argv[1]
+else if set -q argv[1]
+    # We should still go on so the bindings still get set.
+    echo "Unknown argument $argv" >&2
+end
+
+# Inherit shared key bindings.
+# Do this first so vi-bindings win over default.
+for mode in insert default visual
+    __fish_shared_key_bindings -s -M $mode
+end
+
+# Add a way to switch from insert to normal (command) mode.
+# Note if we are paging, we want to stay in insert mode
+# See #2871
+bind -s --preset -M insert \e "if commandline -P; commandline -f cancel; else; set fish_bind_mode default; commandline -f backward-char repaint-mode; end"
+
+# Default (command) mode
+bind -s --preset :q exit
+bind -s --preset -m insert \cc cancel-commandline repaint-mode
+bind -s --preset -M default h backward-char
+bind -s --preset -M default l forward-char
+bind -s --preset -M visual h begin-selection backward-char
+bind -s --preset -M visual l begin-selection forward-char
+bind -s --preset -m insert \n execute
+bind -s --preset -m insert \r execute
+bind -s --preset -m insert o insert-line-under repaint-mode
+bind -s --preset -m insert O insert-line-over repaint-mode
+bind -s --preset -m insert i repaint-mode
+bind -s --preset -m insert I beginning-of-line repaint-mode
+bind -s --preset -m insert a forward-single-char repaint-mode
+bind -s --preset -m insert A end-of-line repaint-mode
+
+# Selection keys (if in default mode)
+bind -s --preset -M default -m visual H begin-selection backward-char
+bind -s --preset -M default -m visual L begin-selection forward-char
+bind -s --preset -M default -m visual J begin-selection down-or-search
+bind -s --preset -M default -m visual K begin-selection up-or-search
+bind -s --preset -M default -m visual x beginning-of-line begin-selection end-of-line
+# TODO: Implement x when already in visual mode
+# (if already in visual mode)
+bind -s --preset -M visual H backward-char
+bind -s --preset -M visual L forward-char
+bind -s --preset -M visual J backward-char
+bind -s --preset -M visual K backward-char
+
+# Goto keys
+bind -s --preset gh end-selection beginning-of-line
+bind -s --preset gj end-selection end-of-buffer
+bind -s --preset gk end-selection beginning-of-buffer
+bind -s --preset gl end-selection end-of-line
+bind -s --preset gg end-selection beginning-of-buffer
+
+# (Goto+Selection) keys
+bind -s --preset -M default -m visual gH begin-selection beginning-of-line
+bind -s --preset -M default -m visual gJ begin-selection end-of-buffer
+bind -s --preset -M default -m visual gK begin-selection beginning-of-buffer
+bind -s --preset -M default -m visual gL begin-selection end-of-line
+bind -s --preset -M visual gH beginning-of-line
+bind -s --preset -M visual gJ end-of-buffer
+bind -s --preset -M visual gK beginning-of-buffer
+bind -s --preset -M visual gL end-of-line
+
+# Undo keys
+bind -s --preset u undo
+bind -s --preset U redo
+
+# History navigation
+bind -s --preset / history-pager --sets-mode insert repaint
+
+bind -s --preset k up-or-search
+bind -s --preset j down-or-search
+bind -s --preset b -m visual backward-word
+bind -s --preset B -m visual backward-bigword
+bind -s --preset w -m visual forward-word forward-single-char
+bind -s --preset W -m visual forward-bigword forward-single-char
+
+# Backspace deletes a char in insert mode
+bind -s --preset -M insert -k backspace backward-delete-char
+bind -s --preset -M insert \ch backward-delete-char
+bind -s --preset -M insert \x7f backward-delete-char
+
+bind -s --preset -M visual d kill-selection
+
+bind -s --preset '~' togglecase-char forward-single-char
+bind -s --preset gu downcase-word
+bind -s --preset gU upcase-word
+
+bind -s --preset J end-of-line delete-char
+bind -s --preset K 'man (commandline -t) 2>/dev/null; or echo -n \a'
+
+bind -s --preset y yank-selection
+
+bind -s --preset -m normal -M visual f forward-jump
+bind -s --preset -m normal -M visual t forward-jump-till
+bind -s --preset -m normal -M visual F backward-jump
+bind -s --preset -m normal -M visual T backward-jump-till
+
+bind -s --preset p forward-char yank
+bind -s --preset P yank
+bind -s --preset gp yank-pop
+
+# same vim 'pasting' note as upper
+bind -s --preset '"*p' forward-char "commandline -i ( xsel -p; echo )[1]"
+bind -s --preset '"*P' "commandline -i ( xsel -p; echo )[1]"
+
+#
+# Lowercase r, enters replace_one mode
+#
+bind -s --preset -m replace_one r repaint-mode
+bind -s --preset -M replace_one -m default '' delete-char self-insert backward-char repaint-mode
+bind -s --preset -M replace_one -m default \r 'commandline -f delete-char; commandline -i \n; commandline -f backward-char; commandline -f repaint-mode'
+bind -s --preset -M replace_one -m default \e cancel repaint-mode
+
+#
+# Uppercase R, enters replace mode
+#
+bind -s --preset -m replace R repaint-mode
+bind -s --preset -M replace '' delete-char self-insert
+bind -s --preset -M replace -m insert \r execute repaint-mode
+bind -s --preset -M replace -m default \e cancel repaint-mode
+
+bind -s --preset -M visual -m insert c kill-selection end-selection repaint-mode
+bind -s --preset -M visual -m default '~' togglecase-selection end-selection repaint-mode
+
+bind -s --preset -M visual -m default \cc end-selection repaint-mode
+bind -s --preset -M visual -m default \e end-selection repaint-mode
+
+# Make it easy to turn an unexecuted command into a comment in the shell history. Also, remove
+# the commenting chars so the command can be further edited then executed.
+bind -s --preset -M default \# __fish_toggle_comment_commandline
+bind -s --preset -M visual \# __fish_toggle_comment_commandline
+bind -s --preset -M replace \# __fish_toggle_comment_commandline
+
+# Set the cursor shape
+# After executing once, this will have defined functions listening for the variable.
+# Therefore it needs to be before setting fish_bind_mode.
+set -g fish_vi_cursor             inclusive
+set -g fish_cursor_selection_mode inclusive
+
+set fish_bind_mode $init_mode

files/fish/fish_variables

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+# This file contains fish universal variable definitions.
+# VERSION: 3.0
+SETUVAR __fish_initialized:3400
+SETUVAR fish_color_autosuggestion:555\x1ebrblack
+SETUVAR fish_color_cancel:\x2dr
+SETUVAR fish_color_command:blue
+SETUVAR fish_color_comment:red
+SETUVAR fish_color_cwd:green
+SETUVAR fish_color_cwd_root:red
+SETUVAR fish_color_end:green
+SETUVAR fish_color_error:brred
+SETUVAR fish_color_escape:brcyan
+SETUVAR fish_color_history_current:\x2d\x2dbold
+SETUVAR fish_color_host:normal
+SETUVAR fish_color_host_remote:yellow
+SETUVAR fish_color_normal:normal
+SETUVAR fish_color_operator:brcyan
+SETUVAR fish_color_param:cyan
+SETUVAR fish_color_quote:yellow
+SETUVAR fish_color_redirection:cyan\x1e\x2d\x2dbold
+SETUVAR fish_color_search_match:bryellow\x1e\x2d\x2dbackground\x3dbrblack
+SETUVAR fish_color_selection:white\x1e\x2d\x2dbold\x1e\x2d\x2dbackground\x3dbrblack
+SETUVAR fish_color_status:red
+SETUVAR fish_color_user:brgreen
+SETUVAR fish_color_valid_path:\x2d\x2dunderline
+SETUVAR fish_key_bindings:fish_default_key_bindings
+SETUVAR fish_pager_color_completion:normal
+SETUVAR fish_pager_color_description:B3A06D\x1eyellow\x1e\x2di
+SETUVAR fish_pager_color_prefix:normal\x1e\x2d\x2dbold\x1e\x2d\x2dunderline
+SETUVAR fish_pager_color_progress:brwhite\x1e\x2d\x2dbackground\x3dcyan
+SETUVAR fish_pager_color_selected_background:\x2dr