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dir.c: use a single struct exclude_list per source of excludes

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Previously each exclude_list could potentially contain patterns
from multiple sources.  For example dir->exclude_list[EXC_FILE]
would typically contain patterns from .git/info/exclude and
core.excludesfile, and dir->exclude_list[EXC_DIRS] could contain
patterns from multiple per-directory .gitignore files during
directory traversal (i.e. when dir->exclude_stack was more than
one item deep).

We split these composite exclude_lists up into three groups of
exclude_lists (EXC_CMDL / EXC_DIRS / EXC_FILE as before), so that each
exclude_list now contains patterns from a single source.  This will
allow us to cleanly track the origin of each pattern simply by adding
a src field to struct exclude_list, rather than to struct exclude,
which would make memory management of the source string tricky in the
EXC_DIRS case where its contents are dynamically generated.

Similarly, by moving the filebuf member from struct exclude_stack to
struct exclude_list, it allows us to track and subsequently free
memory buffers allocated during the parsing of all exclude files,
rather than only tracking buffers allocated for files in the EXC_DIRS
group.

Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Adam Spiers
2013-01-06 16:58:03 +00:00
committed by Junio C Hamano
parent f619881251
commit c082df2453
6 changed files with 86 additions and 39 deletions
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36
dir.h
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@@ -16,14 +16,18 @@ struct dir_entry {
#define EXC_FLAG_NEGATIVE 16
/*
* Each .gitignore file will be parsed into patterns which are then
* appended to the relevant exclude_list (either EXC_DIRS or
* EXC_FILE). exclude_lists are also used to represent the list of
* --exclude values passed via CLI args (EXC_CMDL).
* Each excludes file will be parsed into a fresh exclude_list which
* is appended to the relevant exclude_list_group (either EXC_DIRS or
* EXC_FILE). An exclude_list within the EXC_CMDL exclude_list_group
* can also be used to represent the list of --exclude values passed
* via CLI args.
*/
struct exclude_list {
int nr;
int alloc;
/* remember pointer to exclude file contents so we can free() */
char *filebuf;
struct exclude {
const char *pattern;
int patternlen;
@@ -42,9 +46,13 @@ struct exclude_list {
*/
struct exclude_stack {
struct exclude_stack *prev; /* the struct exclude_stack for the parent directory */
char *filebuf; /* remember pointer to per-directory exclude file contents so we can free() */
int baselen;
int exclude_ix;
int exclude_ix; /* index of exclude_list within EXC_DIRS exclude_list_group */
};
struct exclude_list_group {
int nr, alloc;
struct exclude_list *el;
};
struct dir_struct {
@@ -62,16 +70,23 @@ struct dir_struct {
/* Exclude info */
const char *exclude_per_dir;
struct exclude_list exclude_list[3];
/*
* We maintain three exclude pattern lists:
* We maintain three groups of exclude pattern lists:
*
* EXC_CMDL lists patterns explicitly given on the command line.
* EXC_DIRS lists patterns obtained from per-directory ignore files.
* EXC_FILE lists patterns from fallback ignore files.
* EXC_FILE lists patterns from fallback ignore files, e.g.
* - .git/info/exclude
* - core.excludesfile
*
* Each group contains multiple exclude lists, a single list
* per source.
*/
#define EXC_CMDL 0
#define EXC_DIRS 1
#define EXC_FILE 2
struct exclude_list_group exclude_list_group[3];
/*
* Temporary variables which are used during loading of the
@@ -129,8 +144,9 @@ extern struct exclude *last_exclude_matching_path(struct path_exclude_check *, c
extern int is_path_excluded(struct path_exclude_check *, const char *, int namelen, int *dtype);
extern struct exclude_list *add_exclude_list(struct dir_struct *dir, int group_type);
extern int add_excludes_from_file_to_list(const char *fname, const char *base, int baselen,
char **buf_p, struct exclude_list *el, int check_index);
struct exclude_list *el, int check_index);
extern void add_excludes_from_file(struct dir_struct *, const char *fname);
extern void parse_exclude_pattern(const char **string, int *patternlen, int *flags, int *nowildcardlen);
extern void add_exclude(const char *string, const char *base,