Homepage: https://github.com/Lindydancer/lisp-extra-font-lock
Author: Anders Lindgren
Updated:
Highlight bound variables and quoted exprs
This package highlight the location where local variables is
created (bound, for example by `let') as well as quoted and
backquoted constant expressions.
Example:
Below, `^' is used indicate highlighted normal variables and
constant expressions. `*' is used to show highlighting of special
variables (i.e. those defined by `defvar') and of the backquote and
comma operators.
(defun my-function (next)
^^^^ <- Parameters
(let ((numbers '(one two three))
^^^^^^^ ^^^^^^^^^^^^^^^ <- Var bound by `let' and quoted expr.
(buffer-read-only t))
**************** <- Special variable (different color)
`(,@numbers and ,next)))
*^** ^^^ * ^ <- Backquote and comma
Screenshot:
What is highlighted:
* Parameters in functions and lambdas
* Variables bound by specal constructs like `let', `dolist',
`condition-case', and `pcase-let'
* Normal variables and variables declared as globals using `defvar'
are highlighted in different colors, as a warning
* Quoted expressions
* Backquoted expressions. Subexpressions using the "," or ",@" are
not highlighted (as they are evaluted and thus not constant).
Also, the backquote and the comma operators themselves are
highlighted using a bright color as a warning.
* Hash-quoted symbols.
Installation:
Place this package in a directory in the load-path. To activate it,
use *customize* or place the following lines in a suitable init
file:
(require 'lisp-extra-font-lock)
(lisp-extra-font-lock-global-mode 1)
Customization:
You can modify the following lists to add more functions that are
recognized:
* `lisp-extra-font-lock-let-functions' -- List of function with the
same syntax as `let'
* `lisp-extra-font-lock-defun-functions' -- List of function with
the same syntax as `defun'
* `lisp-extra-font-lock-lambda-functions' -- List of function with
the same syntax as `lambda'
* `lisp-extra-font-lock-dolist-functions' -- List of function with
the same syntax as `dolist'
* `lisp-extra-font-lock-bind-first-functions' -- List of function
that bind their first argument, like `condition-case'.
* `lisp-extra-font-lock-loop-functions' -- List of functions with
the same syntax as `cl-loop'.
The following faces are used when highlighting. You can either
redefine the face (e.g. using a theme), or you can rebind the
corresponding variable.
* Local variables are highlighted using the standard face
`font-lock-variable-name-face'
* Special (global) variables that are rebound are highlighted using
the face bound to the variable
`lisp-extra-font-lock-special-variable-name-face' (by default
`lisp-extra-font-lock-special-variable-name', which inherits from
`font-lock-warning-face')
* Quoted expressions use the face bound to the variable
`lisp-extra-font-lock-quoted-face' (by default
`lisp-extra-font-lock-quoted', which inherits from
`font-lock-constant-face')
* The backquote and comma operators use the face bound to the
variable `lisp-extra-font-lock-backquote-face' (by default
`lisp-extra-font-lock-backquote', which inherits from
`font-lock-warning-face').
* Named arguments to `cl-loop' are highlighted using
`font-lock-builtin-face'.
Example:
To set the face used to highlight quoted expressions to a gray
color, you can use:
(custom-set-faces
'(lisp-extra-font-lock-quoted ((t :foreground "grey50"))))