rename diff_atom->d to diff_atom->root, because it always is The idea was that for each diff box within the files, the atoms would have a backpointer to the current layer of diff_data (indicating the current section), but it is not actually needed to update the backpointer in each atom to the current diff_data. That is why the current code always points atom->d to the root diff_data for the entire file. Clarify by proper name. Constructs like atom->d->root->foo are redundant, just use atom->root->foo.

diff_main: don't run algo if left or right are empty

debug: fix logging first chunk

diff_algo_none: cosmetics

fix diff_algo_none() for ending in plus chunk

results: also combine chunks coming from temp_chunks

fix diff_algo_none(): no NULL pointers for left_start and right_start

diff_state_add_chunk(): fix adding minus above plus chunk: wrong idx

debug tweaks for diff_state_add_chunk()

diff_algo_none(): also detect equal lines at the end

cosmetic: diff_algo_none(): rename to equal_lines_start

cosmetic: diff_algo_none: local pointers for shorter code

move headers from include/diff/ to include/; makes things easier for consumers

repair DEBUG build

convert 'ignore_whitespace' boolean into a more general flags argument

move some definitions from the public diff_main.h to an internal header file

fix segfault which occurred with empty input files

use buffered stdio if falling back on file i/o; this is much faster

reduce default diff-box recursion depth from 1024 to 32

rename 'debug.h' to 'diff_debug.h'

add support for ignoring whitespace (-w option) Tests grow the ability to call diff with options. Options to use are encoded in the test file name as a single dash followed by a string of option letters. E.g. -wp for 'ignore whitespace' and 'do patience'

diff result: ensure sane order of result chunks Ensure that a adjacent chunks of same type are combined, and that a minus block always precedes an adjacent plus block. The upcoming myers-divide optimization is prone to produce weird ordering of plus and minus chunks.

add diff_atom_cmp() and error handling to diff_atom_same()

avoid include statements in header files; make each .c pull in what's needed

replace enum diff_rc errors with plain errno values