How to get list of all header keywords?

[art-den]

I don't find this option in rust-fitsio API

[cjordan]

That's because there is no API for this in cfitsio. I have a hacky way of doing this: https://gist.github.com/cjordan/d8ca8a0c1e73be5123e90b4000abf772

[art-den]

Example how to list keywords goes with cfitsio: https://heasarc.gsfc.nasa.gov/docs/software/fitsio/cexamples/listhead.c

[cjordan]

Right, well that is an example, not part of the API. You could write this yourself in Rust using fitsio-sys; it would look somewhat like my code above.

[simonrw]

Currently rust-fitsio allows the user to choose the type of the header key. I have considered the other alternative - that the crate returns the type for you, which would probably be more useful for this situation. We could probably add a method for iterating over all of the keys (which you could then e.g. collect() into a HashMap for later use), but without types, that API is a bit annoying. As @cjordan said in the other issue without that you would end up reading the key in as a string and parsing yourself.

Until we solve #167 I'm reluctant to start tackling this. Not to say it won't come, but for now @art-den can I suggest you follow @cjordan 's example?

[art-den]

List of all header keywords is not very important now. So I will wait ))