This commit removes `gawk`-specific extensions in Grawkit, making it work for any POSIX-compatible
AWK, with `gawk`, `nawk`, `busybox awk`, and `goawk` passing the test suite successfully.
The largest changes are related to removing `match` extensions for capturing groups; these were used
for parsing command-lines, and have now being handled in the `parse_command` function in a more robust
way.
Other small changes have been made to the included `Makefile` for allowing tests to run against
different AWK implementations.
This further simplifies handling of merges, which was made correct in commit 675e79c. We now
correctly set both source and destination commit references, where an empty source reference means
the base of the branch being merged into.
This version has support for adding commits on a single branch using
`git commit`, and enough scaffolding for adding additional commands and
accompanying tests easily.
Alex Palaistras
Alex Palaistras