Since the code is identical when just checking if a utility is present on
the system or not, we can factorize it.
Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
With these changes, "make sc_prohibit_test_minus_ao" almost passes.
Uses of "test -o" remain.
Note: unchecked uses of test -ot/-nt also remain.
* tests/empty-files: Use "test C1 && test C2", not "test C1 -a C2"
* tests/merge: Likewise.
* tests/symlinks: Likewise.
* tests/test-lib.sh: Likewise.
* tests/test-lib.sh: Flag tests with missing pre-requirements as
SKIPped instead of PASSed. Do not use GNU diff extensions, but
still require a diff that understands "-u".
* tests: Do not unnecessarily require GNU diff in a lot of tests.
Make the sed utility optional.
* tests/merge: Use the sed commands i, a, and c in their standard form
instead of relying on a GNU extension, and pass sed a script (-f)
instead of a list of commands via -e.
Some versions of sed don't support expressions like /^\(\|foo\)$/.
* tests/corrupt-reject-files: Use the more widely available -e switch
instead of -A.
* tests/crlf-handling: Likewise.
* tests/preserve-mode-and-timestamp: Use touch -t instead of touch -d.
Some non-GNU versions of date can't show a file's timestamp.
* src/merge.c: When a hunk has fewer suffix than prefix context lines,
try matching to the end of the file instead of doing a "greedy match":
this allows to detect already-applied inserts at the end of the file.
* tests/merge: Add test cases for this.
to the --merge option to choose the output formats for conflicts.
* patch.man: Document the new optional argument of --merge.
* src/merge.c (merge_hunk): Implement diff3-style conflicts.
* src/common.h (conflict_style): This global variable determines the
output format for conflicts.
* tests/merge: Add test cases for the diff3 output format.
