Karthik Nayak <karthik.188@xxxxxxxxx> writes:
> Introduce match_atom_name() which helps in checking if a particular
> atom is the atom we're looking for and if it has a value attached to
> it or not.
>
> Use it instead of starts_with() for checking the value of %(color:...)
> atom. Write a test for the same.
>
> Mentored-by: Christian Couder <christian.couder@xxxxxxxxx>
> Mentored-by: Matthieu Moy <matthieu.moy@xxxxxxxxxxxxxxx>
> Thanks-to: Junio C Hamano <gitster@xxxxxxxxx>
> Signed-off-by: Karthik Nayak <karthik.188@xxxxxxxxx>
> ---
> ref-filter.c | 23 +++++++++++++++++++++--
> t/t6302-for-each-ref-filter.sh | 4 ++++
> 2 files changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/ref-filter.c b/ref-filter.c
> index a993216..70d36fe 100644
> --- a/ref-filter.c
> +++ b/ref-filter.c
> @@ -189,6 +189,22 @@ static void pop_stack_element(struct ref_formatting_stack **stack)
> *stack = prev;
> }
>
> +static int match_atom_name(const char *name, const char *atom_name, const char **val)
> +{
> + const char *body;
> +
> + if (!skip_prefix(name, atom_name, &body))
> + return 0; /* doesn't even begin with "atom_name" */
> + if (!body[0] || !body[1]) {
> + *val = NULL; /* %(atom_name) and no customization */
Why do we check body[1] here? I do not understand why you are not
checking !body[0] alone nothing else in this if condition.
For (atom_name="align", name="aligna"), should the function say that
"%(aligna)" is an "%(align)" with no customization?
> + return 1;
> + }
> + if (body[0] != ':')
> + return 0; /* "atom_namefoo" is not "atom_name" or "atom_name:..." */
> + *val = body + 1; /* "atom_name:val" */
> + return 1;
> +}
> +
> /*
> * In a format string, find the next occurrence of %(atom).
> */
> @@ -687,6 +703,7 @@ static void populate_value(struct ref_array_item *ref)
> int deref = 0;
> const char *refname;
> const char *formatp;
> + const char *valp;
> struct branch *branch = NULL;
>
> v->handler = append_atom;
> @@ -721,10 +738,12 @@ static void populate_value(struct ref_array_item *ref)
> refname = branch_get_push(branch, NULL);
> if (!refname)
> continue;
> - } else if (starts_with(name, "color:")) {
> + } else if (match_atom_name(name, "color", &valp)) {
Why use the helper only for this one? Aren't existing calls to
starts_with() in the same if/else if/... cascade all potential bugs
that the new helper function is meant to help fixing? For example,
the very fist one in the cascade:
if (starts_with(name, "refname"))
refname = ref->refname;
is correct *ONLY* when name is "refname" or "refname:" followed by
something, and it should skip "refnamex" when such a new atom is
added to valid_atom[] list, i.e. a bug waiting to happen. I think
the new helper is designed to prevent such a bug from happening.
> char color[COLOR_MAXLEN] = "";
>
> - if (color_parse(name + 6, color) < 0)
> + if (!valp)
> + die(_("expected format: %%(color:<color>)"));
> + if (color_parse(valp, color) < 0)
> die(_("unable to parse format"));
> v->s = xstrdup(color);
> continue;
> diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
> index 505a360..c4f0378 100755
> --- a/t/t6302-for-each-ref-filter.sh
> +++ b/t/t6302-for-each-ref-filter.sh
> @@ -81,4 +81,8 @@ test_expect_success 'filtering with --contains' '
> test_cmp expect actual
> '
>
> +test_expect_success '%(color) must fail' '
> + test_must_fail git for-each-ref --format="%(color)%(refname)"
> +'
> +
> test_done
--
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