* params/metrics: diff: implement tabulated markdown output
Via `--show-md` on `diff`s.
* table: show None on missing val
* tests: use `dedent`, add tests for markdown
* diff: add --show-md
Co-authored-by: Ruslan Kuprieiev <[email protected]>
Texttable will try to detect the column type automatically, which
results in a low precision of the float that it is showing. We need to
disable that auto-formatting and just use `str(val)` instead.
Makes it easier to use in shell scripts. E.g. `-z $(dvc metrics diff)`, which
has the same semantics as `git diff`. Also syncs up with the behaviour
of `dvc diff`.
Fixes#3469
Saugat PachhaiandRuslan Kuprieiev
Casper da Costa-Luis
Ruslan Kuprieiev