NewContent is refactored to use the afero.Fs interface that should allow
full testing. This commit also pulls the metadata creation logic out of
NewContent and into a separate function to decrease the cyclomatic
complexity of NewContent.
This uses the Emoji map from https://github.com/kyokomi/emoji -- but with a custom replacement implementation.
The built-in are fine for most use cases, but in Hugo we do care about pure speed.
The benchmarks below are skewed in Hugo's direction as the source and result is a byte slice,
Kyokomi's implementation works best with strings.
Curious: The easy-to-use `strings.Replacer` is also plenty fast.
```
BenchmarkEmojiKyokomiFprint-4 20000 86038 ns/op 33960 B/op 117 allocs/op
BenchmarkEmojiKyokomiSprint-4 20000 83252 ns/op 38232 B/op 122 allocs/op
BenchmarkEmojiStringsReplacer-4 100000 21092 ns/op 17248 B/op 25 allocs/op
BenchmarkHugoEmoji-4 500000 5728 ns/op 624 B/op 13 allocs/op
```
Fixes#1891
See #1772
Also, force DisableLiveReload to true when running "hugo --watch"
(build-only non-server mode) to prevent livereload.ForceRefresh(),
which would end up blocking watchConfig() forever, from being called
because livereload.Initialize() is never called in this case.
This fixes the bug where "hugo --watch" could only reload config.toml
once before it gets stuck for good at livereload.ForceRefresh().
This is also consistent with Hugo's existing behaviour:
Non-server "hugo --watch" has never injected livereload.js
since the inception of the "watch" feature in Hugo v0.12.
Update on the watcher copy static to copy only the
changed files and add an flag forceSyncStatic to
copy all statics always a static is changed
See #1644#1559
especially when the given `--source` path is a relative directory.
Also, when `--source` is specified, make WorkingDir an absolute path
from the very beginning, to be consistent with the case when `--source`
is not given. Otherwise, the function name helpers.AbsPathify(), which
prepends WorkingDir to a relative path, does not really make sense.
Fixes#1721
