You have a parameter on `ouput.file` called `reopen_when` which you should able
to use for that. Schematically, this would look like this:
```
reopen = ref false
def reopen_when() =
if !reopen then
reopen := false
true
else
false
end
end
s = output.file(reopen_when=reopen_when,..)
```
This should allow you to control when to reopen the file by setting `reopen` to
`true` anytime in the code:
```
reopen := true
```
Now, setting the file title is annoying because the mechanism is a little
outdate. You'll have to go through the metadata. Combining with your example
above, it should be something like this:
```
def map_metadata(m) =
if m["trigger"] == "reopen" then
reopen := true
title = m["title"]
# We only need to pass new metadata with update=true (default)
[("filename","#{gettimeofday()}-#{title}")]
else
[]
end
end
out.SOURCE = map_metadata(out.SOURCE)
out.SOURCE = output.file(reopen_when=reopen_when,"$(filename)",out.SOURCE)
```
Haven't tested this but hopefully that should show you the right direction.
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