handle NULL argument to got_diffreg_result_free ok stsp@

include sha2.h too where sha1.h is included In preparation for wide sha256 support; stsp@ agrees. Change done mechanically with find . -iname \*.[cy] -exec sam {} + X ,x/<sha1\.h>/i/\n#include <sha2.h>

remove casts which make older gcc versions unhappy ../lib/diffreg.c:44: error: initializer element is not constant ../lib/diffreg.c:51: error: initializer element is not constant ../lib/diffreg.c:59: error: initializer element is not constant ../lib/diffreg.c:66: error: initializer element is not constant reported by Red on Libera IRC, and by sthen@ who pointed out such failures appearing in landry's sparc64 bulk build logs.

sync file with diff.git 279d77aa1e4b921090e702a6a8a5a94a98a062b1 and use the faster headers-only mode for diff3

switch diff output mode from "edscript" to "plain" for diff3 getchange() in diff3.c takes any line that starts with an integer and treats it as a hunk header. It doesn't actually require ed script instructions, and traditional ed script diff output would break it. Thus, changing Got's diff3 to rely on plain diff output mode paves the way for implementing traditional ed-script style output in diff.git. Patch by Tom Jones

remove trailing whitespace; patch by Josiah Frentsos

tog: keymaps to jump to next/prev file/hunk in the diff Add () and {} key maps to navigate to the previous and next file or hunk in the diff. This required changing Got's diff API to collect line type metadata in addition to the line offsets already produced as prompted by stsp. ok stsp@

switch 'tog diff' and 'tog blame' to Myers diff for speed Make the choice of diff algorithm configurable by diff API users. The got and gotweb programs keep using Patience diffs which are prettier than Myers. But tog should be as fast as possible since it is being used interactively. If performance of Patience diff gets improved later we can consider switching tog back over to it. ok tracey jamsek

move more opentemp out of diffreg.c ok tracey

inline struct got_object_id in struct got_object_qid Saves us from doing a malloc/free call for every item on the list. ok op@

make fclose(3) failure checks consistent; check 'fclose() == EOF' everywhere ok millert, naddy

consistently label removed files as "/dev/null" in diff headers

handle binary files in got/tog diff commands; add -a options to force text

allow for configuring a custom file atomizer with got_diff_get_config()

remove unused function got_diffreg_prepared_files()

simply got_diff_prepare_file() by letting callers worry about file creation

remove unused empty function got_diff_dump_change()

merge new diff implementation from the git.gameoftrees.org diff.git repository This new diff implementation was started by Neels Hofmeyr during the u2k20 hackathon and now replaces diffreg.c code lifted from the OpenBSD base system. The integration of this code into Got was done by me. Got now uses the patience diff algorithm by default. The diff.git repository will remain the primary repository for the diff code, which already compiles and runs on other operating systems such as Linux. Any fixes and improvements for files inherited from the diff.git repository should be written against that repository and synced to got.git afterwards.

avoid creating empty files when one side of a diff is empty; ok tracey

create temporary workaround to opening /dev/null during diffing. this will need to be reworked later. ok stsp

Add missing includes for time() and ctime() These headers were implicitly used on OpenBSD, but building on Linux revealed that <time.h> wasn't included directly. diffreg.c uses ctime(), which additionally needs <sys/types.h>.

Remove return value from diffreg's fetch() The last use of this was removed in 0165cdf03ffac4c24334979832ad27554913d54c over a year ago.

Remove unused variable in diffreg's fetch()

remove unused 'oldfile' parameter from diffreg.c's fetch()

initial 'got stage -p' implementation