hugo/tpl/compare
Bjørn Erik Pedersen 02eaddc2fb
tpl/tplimpl: Fix template truth logic
Before this commit, due to a bug in Go's `text/template` package, this would print different output for typed nil interface values:

```
{{ if .AuthenticatedUser }}User is authenticated!{{ else }}{{ end }}
{{ if not .AuthenticatedUser }}{{ else }}}User is authenticated!{{ end }}
```

This commit works around this by wrapping every `if` and `with` with a custom `getif` template func with truth logic that matches `not`, `and` and `or`.

Those 3 template funcs from Go's stdlib are now pulled into Hugo's source tree and adjusted to support custom zero values, e.g. types that implement `IsZero`.

This means that you can now do:

```
{{ with .Date }}{{ . }}{{ end }}
```

And it would work as expected.

Fixes #5738
2019-03-06 22:52:38 +01:00
..
compare.go
compare_test.go
init.go tpl/tplimpl: Fix template truth logic 2019-03-06 22:52:38 +01:00
init_test.go
truth.go tpl/tplimpl: Fix template truth logic 2019-03-06 22:52:38 +01:00
truth_test.go tpl/tplimpl: Fix template truth logic 2019-03-06 22:52:38 +01:00