Fish Shell Awesomeness

fish_shell_switch.txt

Early days of fish shell impressions.
This is like honeymoon time but I really like it so far.

1. iTerm
alt+command goes back in history.  Weird.  Thought this was tab-navigation in iTerm.

2. Editing past commmands!
up & down to go through history (as usual) but then left-right take you into edit mode!
But how would you add a newline?  Fish doesn't like `;` as much as zsh for newlines.
Well ... you can hit alt+enter and it will do a soft return!

3. Regex matching and lightweight data science
Let's say we have a command we want to run over and over again and capture STDERR text with `time` and append it to a log.
Let's say we want to run it 25 times and then stop.

  touch ~/Desktop/sleep_times.txt
  while [ (wc -l ~/Desktop/sleep_times.txt | string match -r '\d+') -lt 25 ]
    echo "Doing another run ..."
    time 2>> ~/Desktop/sleep_times.txt sleep 1
  end

Fish comes with very nice functions for string manipulation which can be found here:
https://github.com/fish-shell/fish-shell/blob/master/doc_src/string.txt
For example, we could sum up the results real quick with `string join`.

  cat ~/Desktop/sleep_times.txt  | string match -r '(\d+\.\d+) real' | grep -v real | string join ' + ' | bc
  25.00

If the above command doesn't save into your history, it's because it has leading spaces. (WTF)

4. Bob The Fish, packages, fzf.  It's all really really nice.  I think coupled with Mosh shell a lot of legacy goes away.
There is bash support with a plugin called `bass`.  `fisher ls` shows plugins if you are using fisherman (do it).

5. Customizing the bobthefish theme is a tad weird.  Maybe there's another way to do it.  I don't think so because the theme file is commented with instructions.
```
# ~/.config/fish/functions/fish_prompt.fish
# line 909 or so
# These changes darken the git prompt colors a bit.
# But I believe you need to define the existing colors for it to work.

  switch "$theme_color_scheme"
    case 'user'
          set -g theme_color_scheme user
      set -g __color_initial_segment_exit  ffffff ce000f --bold
      set -g __color_initial_segment_su    ffffff 189303 --bold
      set -g __color_initial_segment_jobs  ffffff 255e87 --bold

      set -g __color_path                  333333 999999
      set -g __color_path_basename         333333 ffffff --bold
      set -g __color_path_nowrite          660000 cc9999
      set -g __color_path_nowrite_basename 660000 cc9999 --bold

      set -g __color_repo                  325433 white
      set -g __color_repo_work_tree        333333 ffffff --bold
      set -g __color_repo_dirty            870b00 ffffff
      set -g __color_repo_staged           f6b117 3a2a03

      set -g __color_vi_mode_default       999999 333333 --bold
      set -g __color_vi_mode_insert        189303 333333 --bold
      set -g __color_vi_mode_visual        f6b117 3a2a03 --bold

      set -g __color_vagrant               48b4fb ffffff --bold
      set -g __color_username              cccccc 255e87
      set -g __color_rvm                   af0000 cccccc --bold
      set -g __color_virtualfish           005faf cccccc --bold
```