Handlebars.Net with local File path

Question

I have a configuration value that represents a folder where some files are available for download. This value is a handlebars template:

"D:\{{identifier1}}\{{identifier2}}\SomeFolder\{{version}}"

This value is set per environment by our deploy server.

The problem is that when I run the template through like this:

var template = Handlebars.Compile(_configuration.FilePathFormat);

        return template(new
        {
            identifier1 = 123,
            identifier2 = 456,
            version = "latest"
        });

The result I get back is this:

R:{{identifier1}}{{identifier2}}\SomeFolder{{version}}

What I expect:

R:\123\456\SomeFolder\latest

For some reason it is escaping the handlebars and I don't want that. I have been unable to find anything on disabling escape characters, and no amount of slashes has worked to render the template correctly.

Also, if I put a space between the slash and the handlebar placeholder, it compiles and renders correctly, but then it has a space in the file path.

I found a site that let me test handlebars.js, but it behaves differently than handlebars.net

This was a bug in Handlebars.Net that is now fixed.

Rex M
– Rex M

2018-05-02 02:12:11 +00:00
Commented May 2, 2018 at 2:12 — Rex M
– Rex M, Commented May 2, 2018 at 2:12
Thank you Rex! I'll pull the latest version.

Josh
– Josh

2018-05-09 14:50:26 +00:00
Commented May 9, 2018 at 14:50 — Josh
– Josh, Commented May 9, 2018 at 14:50

gnud · Accepted Answer · 2018-05-02 08:14:19Z

1

Update: Fixed in Handlebars.net

Sice version 1.9.3, released right after I reported the bug, this now works just fine. You have to double your slashes in the template to escape them for Handlebars.Net, same as for Handlebars.js,

var templateText = @"D:\\{{identifier1}}\\{{identifier2}}\\SomeFolder\\{{version}}";
var compiledTemplate = Handlebars.Compile(templateText);

var path = compiledTemplate(new
{
    identifier1 = 123,
    identifier2 = 456,
    version = "latest"
});

Original answer: Yes, it seems Handlebars.net has some weird handling of escape characters.

The simplest workaround is to just invert the slashes in the template string.

var templateText = @"D:/{{identifier1}}/{{identifier2}}/SomeFolder/{{version}}";
var compiledTemplate = Handlebars.Compile(templateText);

var pathWithInvertedSlashes = compiledTemplate(new
{
    identifier1 = 123,
    identifier2 = 456,
    version = "latest"
});
// Inverted slashes normally work fine on Windows, but if you want to
// 'fix' them you can always do
var canonicalPath = Path.GetFullPath(pathWithInvertedSlashes);

edited May 2, 2018 at 8:14

answered May 1, 2018 at 17:42

gnud

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3 Comments

Josh Over a year ago

I started down this path (forcing the \ to /), but was hoping I was missing something. Thanks for the help!

gnud Over a year ago

Handlebars.net has a fixed lookahead when it encounters a backslash. I reported a bug at github.com/rexm/Handlebars.Net/issues/247

Rex M Over a year ago

This bug has been fixed in the latest version of Handlebars.Net. Thanks for raising it!

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