Michal Privoznik <mprivozn@xxxxxxxxxx> writes:
> +--diff-algorithm={patience|minimal|histogram|myers}::
> + Choose a diff algorithm. The variants are as follows:
> ++
> +--
> +`myers`;;
> + The basic greedy diff algorithm.
> +`minimal`;;
> + Spend extra time to make sure the smallest possible diff is
> + produced.
> +`patience`;;
> + Use "patience diff" algorithm when generating patches.
> +`histogram`;;
> + This algorithm extends the patience algorithm to "support
> + low-occurrence common elements".
> +--
> ++
> +For instance, if you configured diff.algorithm variable to a
> +non-default value and want to use the default one, then you
> +have to use `--diff-algorithm=myers` option.
> +
> +You should prefer this option over the `--minimal`, `--patience` and
> +`--histogram` which are kept just for backwards compatibility.
Much better; I'd drop the last paragraph, though.
I also think we really should consider "default" synonym for
whichever happens to be the built-in default (currently myers).
> diff --git a/diff.c b/diff.c
> index e9a7e4d..3e021d5 100644
> --- a/diff.c
> +++ b/diff.c
> @@ -144,7 +144,7 @@ static int git_config_rename(const char *var, const char *value)
> return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
> }
>
> -static long parse_algorithm_value(const char *value)
> +long parse_algorithm_value(const char *value)
> {
> if (!value || !strcasecmp(value, "myers"))
> return 0;
> @@ -3633,6 +3633,16 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
> options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
> else if (!strcmp(arg, "--histogram"))
> options->xdl_opts = DIFF_WITH_ALG(options, HISTOGRAM_DIFF);
> + else if (!prefixcmp(arg, "--diff-algorithm=")) {
> + long value = parse_algorithm_value(arg+17);
> + if (value < 0)
> + return error("option diff-algorithm accepts \"myers\", "
> + "\"minimal\", \"patience\" and \"histogram\"");
> + /* clear out previous settings */
> + DIFF_XDL_CLR(options, NEED_MINIMAL);
> + options->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK;
> + options->xdl_opts |= value;
This makes me wonder if other places that use DIFF_WITH_ALG() also
need to worry about clearing NEED_MINIMAL?
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