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emacs powerline

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README.md

powerline

Emacs version of the Vim powerline.

This is a proposed version 2.0 of the original Emacs Powerline which is a fork of vim-powerline.

Installation

(require 'powerline)
(powerline-default-theme)

The second line customizes mode-line-format according to the default theme.

There are two builtin themes: powerline-default-theme and powerline-center-theme.

You can revert back to the original value of mode-line-format that was being used when powerline was loaded using powerline-revert.

Faces

The faces that powerline uses for the builtin themes are powerline-active1 and powerline-active2 for the active modeline, and powerline-inactive1 ande powerline-inactive2 for the inactive modelines. If you create your own theme, you can add as many faces as you want and pass those faces to the corresponding powerline-* functions when creating your mode-line-format.

Custom Themes

Please look over the powerline-default-theme and powerline-center-theme in powerline-themes.el for examples of themes that involve different justifications of modeline text.

You can write your own powerline theme by simply setting your own mode-line-format to be an evaluation (:eval) of the powerline functions. Notice in powerline-default-theme the let* defines two lists: lhs and rhs which are exactly the lists that define what goes on the left and right sides of the modeline. The powerline-center-theme demonstrates how to center justify part of the modeline and defines an additional center list which is exactly the modeline components to be displayed in the middle section.

In most circumstances you should only need to modify the builtin themes unless you are trying to do a particularly unique layout.

Explanation

This theme does some tricks to improve performance and get all the text justified properly. First, it sets lhs and rhs to a list of powerline sections. You can easily re-utilize builtin modeline formatting by adding it as a raw powerline section. For example,

(powerline-raw mode-line-mule-info nil 'l)

would add the formatting defined in mode-line-mule-info to the modeline as it appears in the default modeline.

The last line of this is what actually puts it all together, by concatonating the lhs, some "fill" space, and rhs. This must be done to ensure that the padding in between the left and right sections properly fills the modeline.

Improvements from this rewrite:

  • Cleaner code.
  • Try to simply be a library that provides functions for generating a mode-line
  • Make right-aligned text actually be flush against the right side.
  • Separators are designed to dynamically size their height based on the font settings.
  • Separators spread their width to the nearest character width. (This is required to make right-aligned text actually be right-aligned)

Implementing New Separators

The function should return an XPM image created using the create-image function.

There is a function called memoize that will help make calling the function multiple times with the same parameters be much quicker by caching the return value.

Each divider should have the signature: (face1 face2 &optional height)

face1 : the left-hand face

face2 : the right-hand face

height : specifies the height of the XPM, most of time this is (font-char-height)

Separators should consider the height when they are created so that the mode-line can change sizes based on the font height.

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