doc_src/cmds/fish_greeting.rst

.. _cmd-fish_greeting:

fish_greeting - display a welcome message in interactive shells
===============================================================

Synopsis
--------

.. synopsis::

    fish_greeting

::

  function fish_greeting
      ...
  end


Description
-----------

When an interactive fish starts, it executes fish_greeting and displays its output.

The default fish_greeting is a function that prints a variable of the same name (``$fish_greeting``), so you can also just change that if you just want to change the text.

While you could also just put ``echo`` calls into config.fish, fish_greeting takes care of only being used in interactive shells, so it won't be used e.g. with ``scp`` (which executes a shell), which prevents some errors.

Example
-------

A simple greeting:

::

  function fish_greeting
      echo Hello friend!
      echo The time is (set_color yellow; date +%T; set_color normal) and this machine is called $hostname
  end
docs: Add fish_title and fish_greeting 2020-10-28 17:38:41 +01:00			`.. _cmd-fish_greeting:`

			`fish_greeting - display a welcome message in interactive shells`
			`===============================================================`

			`Synopsis`
			`--------`

docs synopsis: add HTML highlighing and automate manpage markup Recent synopsis changes move from literal code blocks to [RST line blocks]. This does not translate well to HTML: it's not rendered in monospace, so aligment is lost. Additionally, we don't get syntax highlighting in HTML, which adds differences to our code samples which are highlighted. We hard-wrap synopsis lines (like code blocks). To align continuation lines in manpages we need [backslashes in weird places]. Combined with the *, , and `` markup, it's a bit hard to get the alignment right. Fix these by moving synopsis sources back to code blocks and compute HTML syntax highlighting and manpage markup with a custom Sphinx extension. The new Pygments lexer can tokenize a synopsis and assign the various highlighting roles, which closely matches fish's syntax highlighing: - command/keyword (dark blue) - parameter (light blue) - operator like and/or/not/&&/\|\| (cyan) - grammar metacharacter (black) For manpage output, we don't project the fish syntax highlighting but follow the markup convention in GNU's man(1): bold text type exactly as shown. italic text replace with appropriate argument. To make it easy to separate these two automatically, formalize that (italic) placeholders must be uppercase; while all lowercase text is interpreted literally (so rendered bold). This makes manpages more consistent, see string-join(1) and and(1). Implementation notes: Since we want manpage formatting but Sphinx's Pygments highlighing plugin does not support manpage output, add our custom "synopsis" directive. This directive parses differently when manpage output is specified. This means that the HTML and manpage build processes must not share a cache, because the parsed doctrees are cached. Work around this by using separate cache locations for build targets "sphinx-docs" (which creates HTML) and "sphinx-manpages". A better solution would be to only override Sphinx's ManualPageBuilder but that would take a bit more code (ideally we could override ManualPageWriter but Sphinx 4.3.2 doesn't really support that). --- Alternative solution: stick with line blocks but use roles like :command: or :option: (or custom ones). While this would make it possible to produce HTML that is consistent with code blocks (by adding a bit of CSS), the source would look uglier and is harder to maintain. (Let's say we want to add custom formatting to the [\|] metacharacters in HTML. This is much easier with the proposed patch.) --- [RST line blocks]: https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#line-blocks [backslashes in weird places]: https://github.com/fish-shell/fish-shell/pull/8626#discussion_r782837750 2022-01-09 15:09:46 +01:00			`.. synopsis::`

			`fish_greeting`

docs: Add fish_title and fish_greeting 2020-10-28 17:38:41 +01:00			`::`

			`function fish_greeting`
			`...`
			`end`


			`Description`
			`-----------`

			`When an interactive fish starts, it executes fish_greeting and displays its output.`

			The default fish_greeting is a function that prints a variable of the same name (``$fish_greeting``), so you can also just change that if you just want to change the text.

			While you could also just put ``echo`` calls into config.fish, fish_greeting takes care of only being used in interactive shells, so it won't be used e.g. with ``scp`` (which executes a shell), which prevents some errors.

			`Example`
			`-------`

			`A simple greeting:`

			`::`

			`function fish_greeting`
			`echo Hello friend!`
			`echo The time is (set_color yellow; date +%T; set_color normal) and this machine is called $hostname`
			`end`