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Create BoutOptionsFile with grid if available#339

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mikekryjak wants to merge 1 commit intomasterfrom
input-file-grid
Open

Create BoutOptionsFile with grid if available#339
mikekryjak wants to merge 1 commit intomasterfrom
input-file-grid

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Loading a BOUT++ dataset will automatically create a BoutOptionsFile, which at the moment will want to read the grid file to evaluate input file expressions with .recalculate_xyz(). However, it can't easily find the grid file on its own - it will assume it's in the working directory, which is nearly always incorrect in my case. It will then try to find nx and ny in the input file, which is always incorrect in my case.

This PR constructs a BoutOptionsFile using the already known gridfilepath if it's available, which it always is in my use case. If it's unavailable, it falls back on the previous behaviour.

This is connected to boutproject/boutdata#145. I'm trying to fix all the warnings I get when loading datasets.

If you want the input file and don't pass a grid, it'll struggle because nx/ny/nz are often missing from the input file, and the grid may not be in the directory where you run the script from. xBOUT knows where the grid is though!
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