From: James Nguyen <jamesn@fastmail.com>
To: 27503@debbugs.gnu.org
Cc: james@jojojames.com
Subject: bug#27503: 26.0.50; Not lining up Javascript arguments
Date: Mon, 26 Jun 2017 18:49:59 -0700 [thread overview]
Message-ID: <87FF3D96-DBCF-4EBD-8E72-3F796AB89FF1@fastmail.com> (raw)
I'd like to have js-mode line up arguments normally instead of lining up
arg-wise.
For example:
function functionName(arg1,
arg2) {}
vs
function functionName(arg1,
arg2)
I think js-mode only support the former at this point. The latter seems
to be fairly common so it'd be great if we could support it.
Following this:
https://emacs.stackexchange.com/questions/29973/stop-javascript-mode-from-lining-up-function-parameters-after-newline/29975#29975
seems to give accurate indentation similar to other editors.
(defun javascript/indent-args (parse-status)
"Return the proper indentation for the current line."
(save-excursion
(back-to-indentation)
(cond ((nth 4 parse-status) ; inside comment
(js--get-c-offset 'c (nth 8 parse-status)))
((nth 3 parse-status) 0) ; inside string
((eq (char-after) ?#) 0)
((save-excursion (js--beginning-of-macro)) 4)
;; Indent array comprehension continuation lines specially.
((let ((bracket (nth 1 parse-status))
beg)
(and bracket
(not (js--same-line bracket))
(setq beg (js--indent-in-array-comp bracket))
;; At or after the first loop?
(>= (point) beg)
(js--array-comp-indentation bracket beg))))
((js--chained-expression-p))
((js--ctrl-statement-indentation))
((js--multi-line-declaration-indentation))
((nth 1 parse-status)
;; A single closing paren/bracket should be indented at the
;; same level as the opening statement. Same goes for
;; "case" and "default".
(let ((same-indent-p (looking-at "[]})]"))
(switch-keyword-p (looking-at "default\\_>\\|case\\_>[^:]"))
(continued-expr-p (js--continued-expression-p)))
(goto-char (nth 1 parse-status)) ; go to the opening char
(progn ; nothing following the opening paren/bracket
(skip-syntax-backward " ")
(when (eq (char-before) ?\)) (backward-list))
(back-to-indentation)
(js--maybe-goto-declaration-keyword-end parse-status)
(let* ((in-switch-p (unless same-indent-p
(looking-at "\\_<switch\\_>")))
(same-indent-p (or same-indent-p
(and switch-keyword-p
in-switch-p)))
(indent
(cond (same-indent-p
(current-column))
(continued-expr-p
(+ (current-column) (* 2 js-indent-level)
js-expr-indent-offset))
(t
(+ (current-column) js-indent-level
(pcase (char-after (nth 1 parse-status))
(?\( js-paren-indent-offset)
(?\[ js-square-indent-offset)
(?\{ js-curly-indent-offset)))))))
(if in-switch-p
(+ indent js-switch-indent-offset)
indent)))))
((js--continued-expression-p)
(+ js-indent-level js-expr-indent-offset))
(t (prog-first-column)))))
(advice-add 'js--proper-indentation :override 'javascript/indent-args)
1. This removes an entire if block check. That is probably doing
something I'm not aware of.
2. We probably want to make it configuration either way (something
similar to js-comment-lineup-func (but that seems to only be for comments.))
Some source code to play with is:
#+begin_src mhtml :tangle yes
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Lifecycle</title>
<style>
body, textarea {
font-family: Courier;
}
</style>
</head>
<body>
<div id="app">
<!-- my app renders here -->
</div>
<script src="react/build/react.js"></script>
<script src="react/build/react-dom.js"></script>
<script>
var logMixin = {
_log: function(methodName, args) {
console.log(this.name + '::' + methodName, args);
},
componentWillUpdate: function() {this._log('componentWillUpdate', arguments);},
componentDidUpdate: function() {this._log('componentDidUpdate', arguments);},
componentWillMount: function() {this._log('componentWillMount', arguments);},
componentDidMount: function() {this._log('componentDidMount', arguments);},
componentWillUnmount: function() {this._log('componentWillUnmount', arguments);},
};
var TextAreaCounter = React.createClass({
name: 'TextAreaCounter',
mixins: [logMixin],
propTypes: {
defaultValue: React.PropTypes.string,
},
getInitialState: function() {
return {
text: this.props.defaultValue,
};
},
_textChange: function(ev) {
this.setState({
text: ev.target.value,
});
},
render: function() {
return React.DOM.div(null,
React.DOM.textarea({
value: this.state.text,
onChange: this._textChange,
}),
React.DOM.h3(null, this.state.text.length)
);
}
});
var myTextAreaCounter = ReactDOM.render(
React.createElement(TextAreaCounter, {
defaultValue: "Bob",
}),
document.getElementById("app")
);
</script>
</body>
</html>
#+end_src
More specifically:
#+begin_src mhtml :tangle yes
render: function() {
return React.DOM.div(null,
React.DOM.textarea({
value: this.state.text,
onChange: this._textChange,
}),
React.DOM.h3(null, this.state.text.length)
);
}
#+end_src
With the current indent settings, we get:
#+begin_src mhtml :tangle yes
render: function() {
return React.DOM.div(null,
React.DOM.textarea({
value: this.state.text,
onChange: this._textChange,
}),
React.DOM.h3(null, this.state.text.length)
);
}
#+end_src
With the above advice:
#+begin_src mhtml :tangle yes
render: function() {
return React.DOM.div(null,
React.DOM.textarea({
value: this.state.text,
onChange: this._textChange,
}),
React.DOM.h3(null, this.state.text.length)
);
}
#+end_src
In GNU Emacs 26.0.50 (build 4, x86_64-apple-darwin16.5.0, NS appkit-1504.82 Version 10.12.4 (Build 16E195))
of 2017-06-24 built on jamesretina.local
Repository revision: 16d2695674a4c8abbec846c427fe8abef97e07ef
Windowing system distributor 'Apple', version 10.3.1504
Recent messages:
The following feature was found in load-path, please check if that’s correct:
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Successfully reloaded Org
Org-mode version 8.2.10 (release_8.2.10 @ /Users/james/Code/emacs/nextstep/Emacs.app/Contents/Resources/lisp/org/)
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Features:
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next reply other threads:[~2017-06-27 1:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-27 1:49 James Nguyen [this message]
2017-06-27 18:16 ` bug#27503: 26.0.50; Not lining up Javascript arguments Ingo Lohmar
2017-06-27 19:42 ` James Nguyen
2017-06-27 20:44 ` Ingo Lohmar
2017-06-28 0:45 ` James Nguyen
2017-06-28 10:36 ` Dmitry Gutov
2017-06-28 10:57 ` Nicolas Petton
2017-06-28 10:35 ` Dmitry Gutov
2017-06-28 14:56 ` Ingo Lohmar
2017-06-29 0:52 ` Dmitry Gutov
2017-07-01 11:23 ` Ingo Lohmar
2017-07-03 2:11 ` Dmitry Gutov
2017-07-03 18:05 ` Ingo Lohmar
2017-07-03 18:21 ` Ingo Lohmar
2017-07-03 21:01 ` Dmitry Gutov
2017-07-03 23:14 ` James Nguyen
2017-07-03 20:17 ` Dmitry Gutov
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