Fish Shell

1. Add or Remove PATH in fish

To permanently add the path /opt/cuda/bin to your PATH variable, use the command fish_add_path /opt/cuda/bin. This will ensure the path remains in your environment even after restarting the terminal, without needing to include the command in config.fish.

set --erase --universal fish_user_paths[4] can erase the 4th path universally so it persists in new sessions.

I prefer to use a global fish_user_paths. This is not save automatically, I need to add this to config.fish, if I want it to stay:

fish_add_path -g /opt/cuda/bin

2. Lazy-Loading Conda for Faster Shell Startup

In machine learning, we often use conda to manage our python environments, and have several conda installations (on network drives, in $HOME, etc…). It can be a pain to manage them. Worse still, since conda loads on shell startup, it can noticeably slow you down when opening terminals – especially when loading it off a slow network.

Here’s a simple trick for your shell config to alleviate the pain:

set -x CONDA_PATH /opt/miniconda3/bin/conda $HOME/miniconda3/bin/conda

function conda
    echo "Lazy loading conda upon first invocation..."
    functions --erase conda
    for conda_path in $CONDA_PATH
        if test -f $conda_path
            echo "Using Conda installation found in $conda_path"
            eval $conda_path "shell.fish" "hook" | source
            conda $argv
            return
        end
    end
    echo "No conda installation found in $CONDA_PATH"
end

This snippet is for the fish shell and goes in your config.fish. It replaces the block that conda auto-generates when you run conda init fish (the one that begins with # !! Contents within this block are managed by 'conda init' !!).

3. Configuration of shortcuts for fish

Use bind to configure the shortcuts, e.g., bind -M insert \ck 'accept-autosuggestion'. -M is used to define the mode of the shortcut. accept-autosuggestion is the input function, which means accept the current autosuggestion. For more special function see this.

In fish bind -M normal can not work for normal mode of vi input method. However, bind -M default works fine for the normal mode of the vi input method.

3.1. Shortcut to copy contents selected in visual model to the clipboard.

bind --mode visual --sets-mode default Y 'fish_clipboard_copy; commandline -f repaint-mode; commandline -f end-selection'

--sets-mode default go back to the normal mode after fish_clipboard_copy.

commandline -f repaint-mode can refresh the mode then show N (normal mode), otherwise it will show V, even though it has already gone back to normal mode by --set-mode default.

commandline -f end-selection can stop selection, otherwise it will still highlight the contents which are selected before.

commandline -f function is useful. The detail of the functions can be used see ‘man bind’.

4. Set the default editor in fish

fzf allows fish to use fuzzy search. \co is a shortcut of fzf-fish to open a file by fuzzy search with default editor. The default editor can be set by set -gx EDITOR nvim.