That kind of tight feedback loop will be useful while learning Clojure and, later, when writing real Clojure programs. The reason I recommend Emacs is that it offers tight integration with a Clojure REPL, which allows you to instantly try out your code as you write. Two alternatives that I recommend and that are well regarded in the community are Cursive and Nightcode. If you don’t follow the thorough Emacs instructions in this chapter, or if you choose to use a different editor, it’s worthwhile to at least invest some time in setting up your editor to work with a REPL. I highly recommend working with Emacs, but you can, of course, use any editor you want. On your journey to Clojure mastery, your editor will be your closest ally. Chapter 2 How to Use Emacs, an Excellent Clojure Editor "Used for tabs and such.") ( defvar my-extra-keywords Put the following in your init file: ( defface extra-whitespace-face You can add an add-hook statement for every other mode you want this for. This code uses font-lock to highlight TABs with face ‘extra-whitespace-face’ in ‘emacs-lisp-mode’ and in ‘text-mode’. using typographical symbols (pilcrow for return, middle dot for space, guillmet for tab).ShowWhitespaceMode shows whitespace in either of two ways: 80-Column RuleĮight圜olumnRule provides highlighting of trailing spaces, TABs, and lines past column 80. Library redspace.el detects and highlights trailing whitespace. So turn on font-lock before BlankMode, if you want font-lock to stay on after BlankMode is turned off. So, if BlankMode is turned on and font-lock is off, BlankMode also turns on the font-lock to highlight blanks, but font-lock is turned off when BlankMode is turned off. When blank-mode is on, it looks like this:īlankMode saves and restores the font-lock state when it is turned on and off. BlankModeīlank-mode.el ( BlankMode) was a precursor to standard library whitespace.el (see WhiteSpace) and has been replaced by it. Or all Unicode characters in the range ?\u2190 through ?\u21ff (mathematical arrows) except ?\u21b6, ?\u21b7, ?\u21ba, and ?\u21bb (curved arrows). Or all characters in class (whitespace) except ‘tab’. You can thus, for example, highlight all characters in character set ‘greek-iso8859-7’ except ‘GREEK SMALL LETTER LAMBDA’. In addition, you can exclude any set of characters from this highlighting. range of successive chars (Emacs characters are integers).You can define the set using any number of entries of any of these kinds: Unlike what is offered by libraries such as whitespace.el, with library highlight-chars.el you are not limited to whitespace highlighting. Not Just Whitespace - Highlight Any Set of Characters automatically whenever a buffer is in a given major mode.globally whenever FontLockMode is turned on, or.in the current buffer only (i.e., locally),.You can turn on/off the highlighting provided by library highlight-chars.el: Or you can turn on tab highlighting by default by adding function ‘hc-highlight-tabs’ to ‘font-lock-mode-hook’ in your init file: (add-hook 'font-lock-mode-hook 'hc-highlight-tabs) You can highlight whitespace and other easily confused characters: spaces, tabs, hard spaces, and hard hyphens, as well as trailing whitespace.įor example, command ‘hc-toggle-highlight-tabs’ turns on/off highlighting of tab chars. There are commands and functions to use on hooks. Library highlight-chars.el lets you easily highlight any sets of characters that you choose, including whitespace characters. (Library highlight-chars.el replaces obsolete library show-wspace.el.) You can use face ‘default’ for invisible whitespace, if you don’t care about trailing whitespace: (setq cperl-invalid-face 'default) You can specify the face to use for trailing whitespace. CPerlĬPerl shows trailing whitespace by default. GNU Emacs 21 or later provides the option ‘show-trailing-whitespace’ to highlight trailing whitespace in face ‘trailing-whitespace’. GNU Emacs 22 or later has library whitespace.el, which lets you highlight whitespace in several ways. But the face is hardwired, and you cannot highlight only one of these chars. GNU Emacs 24 has internal variable ‘nobreak-char-display’ (turned on by default), which highlights hard space and hard hyphen characters. This page is about making particular whitespace characters stand out better.Įmacs comes with a standard solution: M-x whitespace-mode.
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