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- .Dd April 5, 2016
- .Dt he 1
- .Sh NAME
- .Nm he
- .Nd encode/decode HTML entities just like a browser would
- .Sh SYNOPSIS
- .Nm
- .Op Fl -escape Ar string
- .br
- .Op Fl -encode Ar string
- .br
- .Op Fl -encode Fl -use-named-refs Fl -everything Fl -allow-unsafe Ar string
- .br
- .Op Fl -decode Ar string
- .br
- .Op Fl -decode Fl -attribute Ar string
- .br
- .Op Fl -decode Fl -strict Ar string
- .br
- .Op Fl v | -version
- .br
- .Op Fl h | -help
- .Sh DESCRIPTION
- .Nm
- encodes/decodes HTML entities in strings just like a browser would.
- .Sh OPTIONS
- .Bl -ohang -offset
- .It Sy "--escape"
- Take a string of text and escape it for use in text contexts in XML or HTML documents. Only the following characters are escaped: `&`, `<`, `>`, `"`, and `'`.
- .It Sy "--encode"
- Take a string of text and encode any symbols that aren't printable ASCII symbols and that can be replaced with character references. For example, it would turn `©` into `©`, but it wouldn't turn `+` into `+` since there is no point in doing so. Additionally, it replaces any remaining non-ASCII symbols with a hexadecimal escape sequence (e.g. `𝌆`). The return value of this function is always valid HTML.
- .It Sy "--encode --use-named-refs"
- Enable the use of named character references (like `©`) in the output. If compatibility with older browsers is a concern, don't use this option.
- .It Sy "--encode --everything"
- Encode every symbol in the input string, even safe printable ASCII symbols.
- .It Sy "--encode --allow-unsafe"
- Encode non-ASCII characters only. This leaves unsafe HTML/XML symbols like `&`, `<`, `>`, `"`, and `'` intact.
- .It Sy "--encode --decimal"
- Use decimal digits rather than hexadecimal digits for encoded character references, e.g. output `©` instead of `©`.
- .It Sy "--decode"
- Takes a string of HTML and decode any named and numerical character references in it using the algorithm described in the HTML spec.
- .It Sy "--decode --attribute"
- Parse the input as if it was an HTML attribute value rather than a string in an HTML text content.
- .It Sy "--decode --strict"
- Throw an error if an invalid character reference is encountered.
- .It Sy "-v, --version"
- Print he's version.
- .It Sy "-h, --help"
- Show the help screen.
- .El
- .Sh EXIT STATUS
- The
- .Nm he
- utility exits with one of the following values:
- .Pp
- .Bl -tag -width flag -compact
- .It Li 0
- .Nm
- did what it was instructed to do successfully; either it encoded/decoded the input and printed the result, or it printed the version or usage message.
- .It Li 1
- .Nm
- encountered an error.
- .El
- .Sh EXAMPLES
- .Bl -ohang -offset
- .It Sy "he --escape '<script>alert(1)</script>'"
- Print an escaped version of the given string that is safe for use in HTML text contexts, escaping only `&`, `<`, `>`, `"`, and `'`.
- .It Sy "he --decode '©𝌆'"
- Print the decoded version of the given HTML string.
- .It Sy "echo\ '©𝌆'\ |\ he --decode"
- Print the decoded version of the HTML string that gets piped in.
- .El
- .Sh BUGS
- he's bug tracker is located at <https://github.com/mathiasbynens/he/issues>.
- .Sh AUTHOR
- Mathias Bynens <https://mathiasbynens.be/>
- .Sh WWW
- <https://mths.be/he>
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