Update to Go 1.18 (still in beta) (a list of Hugo related improvements)

[bep]

The upcoming Go version (still some months away) is pretty cool, and contains some useful stuff for Hugo, too. I suspect we need to stop supporting older Go versions if we start using it, but that's probably worth it.

Some notes about what's new and relevant (also see https://tip.golang.org/doc/go1.18):

• text/template/html/template
  • The and function no longer always evaluates all arguments; it stops evaluating arguments after the first argument that evaluates to false. Similarly, the or function now stops evaluating arguments after the first argument that evaluates to true. This makes a difference if any of the arguments is a function call.
  • break and continue for range
• Generics (maybe not very relevant, but it may certainly simplify some internals)
• The go command now embeds version control information in binaries including the currently checked-out revision, commit time, and a flag indicating whether edited or untracked files are present.
• A new workspace mode (go.work) which should enable much improved local development of Hugo Modules.
• bytes/strings:
  • The new Cut function slices a []byte around a separator. It can replace and simplify many common uses of Index, IndexByte, IndexRune, and SplitN.
  • Trim, TrimLeft, and TrimRight are now allocation free and, especially for small ASCII cutsets, up to 10 times faster.
  • The Title function is now deprecated. It doesn't handle Unicode punctuation and language-specific capitalization rules, and is superseded by the golang.org/x/text/cases package.
• reflect
  • The new Value.SetIterKey and Value.SetIterValue methods set a Value using a map iterator as the source. They are equivalent to Value.Set(iter.Key()) and Value.Set(iter.Value()) but do fewer allocations.
  • A number of methods ( Value.CanInt, Value.CanUint, Value.CanFloat, Value.CanComplex ) have been added to Value to test if a conversion is safe.
  • ...
• sync
  • The new methods Mutex.TryLock, RWMutex.TryLock, and RWMutex.TryRLock, will acquire the lock if it is not currently held.

[regisphilibert]

break and continue has been long awaited! As for the rest I trust your judgment ☺️.

Can the reflect improvements let us hope for more type testing? (As in reflect.IsString etc... ?

[jmooring]

We updated to Go 1.18 with v0.95.0.

[github-actions[bot]]

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