Add an environment variable ICDIFF_DEFAULTS to allow setting default flags
#191
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…t flags. I'm not 100% happy with this because there's no way to override boolean options using `optparse`. i.e. if `ICDIFF_DEFAULTS=-N` there is no way to override that on the command line. Switching to `argparse` would allow that via `BooleanOptionalAction` but that requires python 3.9. With `optparse, I could also add `no-XXX` flags for all the existing boolean flags - LMK.
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I'm not 100% happy with this because there's no way to override boolean
options using
optparse. i.e. ifICDIFF_DEFAULTS=-Nthere is no wayto override that on the command line.
Switching to
argparsewould allow that viaBooleanOptionalActionbutthat requires python 3.9.
With
optparse, I could also addno-XXXflags for all the existingboolean flags - LMK.
I use the exact string I put in the
READMEFYI. I set that up in my VCS but I'd like to have it in effect all the time.