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| function dedent(callSite, ...args) { | |
| function format(str) { | |
| let size = -1; | |
| return str.replace(/\n(\s+)/g, (m, m1) => { | |
| if (size < 0) | |
| size = m1.replace(/\t/g, " ").length; | |
| return "\n" + m1.slice(Math.min(m1.length, size)); | |
| }); | |
| } | |
| if (typeof callSite === "string") | |
| return format(callSite); | |
| if (typeof callSite === "function") | |
| return (...args) => format(callSite(...args)); | |
| let output = callSite | |
| .slice(0, args.length + 1) | |
| .map((text, i) => (i === 0 ? "" : args[i - 1]) + text) | |
| .join(""); | |
| return format(output); | |
| } | |
| let output; | |
| console.log("=== As a string function ==="); | |
| output = dedent(` | |
| this | |
| is | |
| the ${ "end" } | |
| my only | |
| friend | |
| the end | |
| `); | |
| console.log(output); | |
| console.log("=== As a template tag ==="); | |
| output = dedent` | |
| this | |
| is | |
| the ${ "end" } | |
| my only | |
| friend | |
| the end | |
| `; | |
| console.log(output); | |
| console.log("=== As a higher-order template tag ==="); | |
| output = dedent(String.raw)` | |
| this | |
| is | |
| the ${ "end" } | |
| my only | |
| friend | |
| the \end | |
| `; | |
| console.log(output); |
@simevidas It’s there to demonstrate that String.raw still works as expected.
Now we need to make a babel plugin to do the dedent at compile time...
Nevermind someone beat me to it!
https://github.com/MartinKolarik/babel-plugin-dedent/blob/master/README.md
@mathiasbynens Thanks !
+1 for Jim Morrison
This is a fantastic utility! Any recommendation on how to get a hard return (\n and maybe \r\n) between two sets of de-dented content?
I'm creating a string for an *.eml file, and it's VERY finicky. I must supply a \n before the html section (see screenshot).
Although my output technically works, it would be cool to eliminate the 4 spaces ahead of <html>. But, I admit, it's probably a bit pedantic.
What I tried: I attempted to separate the header and body, and then recombine them with a \n via a template literal string, but it didn't work... actually it would not respect that \n at all.
structuredEmail = `${header}\n${body}
//new line not in output ----->>>> now that I think of it, it should probably be two: \n\n
==== UPDATE: A FEW MOMENTS LATER ====
Okay, I fixed it this way:
const structuredEmail = dedent(`To:
Subject: ${subject}
X-Unsent: 1
Content-Type: text/html
\n<html>
<body>
<h2>Job Description</h2>
${JobDescription}
<h2>Qualifications</h2>
${Qualifications}
</body>
</html>
`);
Could you explain the backslash in line 66 (
the \end)?