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Website: http://fishshell.com
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Tutorial: http://fishshell.com/tutorial.html
- informative (current): https://github.com/fish-shell/fish-shell/blob/master/share/tools/web_config/sample_prompts/informative_git.fish
- Git support: https://github.com/fish-shell/fish-shell/blob/master/share/functions/__fish_git_prompt.fish
- https://coderwall.com/p/9ffh6q
- http://zogovic.com/post/37906589287/showing-git-branch-in-fish-shell-prompt
- git branch completion: fish-shell/fish-shell#675