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![Jeff King](/assets/img/avatar_default.png)
Since the previous commit dropped the hard-coded limit in
traverse_trees(), we don't need this macro there anymore (the code can
handle any number of trees in parallel).
We do define MAX_UNPACK_TREES using MAX_TRAVERSE_TREES, due to
5290d45134
(tree-walk.c: break circular dependency with unpack-trees,
2020-02-01). So we can just directly define that as "8" now; we know
traverse_trees() can handle whatever we throw at it.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
229 lines
6.9 KiB
C
229 lines
6.9 KiB
C
#ifndef TREE_WALK_H
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#define TREE_WALK_H
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#include "hash-ll.h"
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struct index_state;
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struct repository;
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/**
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* The tree walking API is used to traverse and inspect trees.
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*/
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/**
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* An entry in a tree. Each entry has a sha1 identifier, pathname, and mode.
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*/
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struct name_entry {
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struct object_id oid;
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const char *path;
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int pathlen;
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unsigned int mode;
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};
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/**
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* A semi-opaque data structure used to maintain the current state of the walk.
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*/
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struct tree_desc {
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/*
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* pointer into the memory representation of the tree. It always
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* points at the current entry being visited.
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*/
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const void *buffer;
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/* points to the current entry being visited. */
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struct name_entry entry;
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/* counts the number of bytes left in the `buffer`. */
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unsigned int size;
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/* option flags passed via init_tree_desc_gently() */
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enum tree_desc_flags {
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TREE_DESC_RAW_MODES = (1 << 0),
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} flags;
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};
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/**
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* Decode the entry currently being visited (the one pointed to by
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* `tree_desc's` `entry` member) and return the sha1 of the entry. The
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* `pathp` and `modep` arguments are set to the entry's pathname and mode
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* respectively.
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*/
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static inline const struct object_id *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned short *modep)
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{
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*pathp = desc->entry.path;
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*modep = desc->entry.mode;
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return &desc->entry.oid;
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}
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/**
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* Calculate the length of a tree entry's pathname. This utilizes the
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* memory structure of a tree entry to avoid the overhead of using a
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* generic strlen().
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*/
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static inline int tree_entry_len(const struct name_entry *ne)
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{
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return ne->pathlen;
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}
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/*
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* The _gently versions of these functions warn and return false on a
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* corrupt tree entry rather than dying,
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*/
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/**
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* Walk to the next entry in a tree. This is commonly used in conjunction
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* with `tree_entry_extract` to inspect the current entry.
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*/
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void update_tree_entry(struct tree_desc *);
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int update_tree_entry_gently(struct tree_desc *);
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/**
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* Initialize a `tree_desc` and decode its first entry. The buffer and
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* size parameters are assumed to be the same as the buffer and size
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* members of `struct tree`.
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*/
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void init_tree_desc(struct tree_desc *desc, const void *buf, unsigned long size);
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int init_tree_desc_gently(struct tree_desc *desc, const void *buf, unsigned long size,
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enum tree_desc_flags flags);
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/*
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* Visit the next entry in a tree. Returns 1 when there are more entries
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* left to visit and 0 when all entries have been visited. This is
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* commonly used in the test of a while loop.
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*/
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int tree_entry(struct tree_desc *, struct name_entry *);
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int tree_entry_gently(struct tree_desc *, struct name_entry *);
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/**
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* Initialize a `tree_desc` and decode its first entry given the
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* object ID of a tree. Returns the `buffer` member if the latter
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* is a valid tree identifier and NULL otherwise.
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*/
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void *fill_tree_descriptor(struct repository *r,
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struct tree_desc *desc,
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const struct object_id *oid);
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struct traverse_info;
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typedef int (*traverse_callback_t)(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *);
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/**
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* Traverse `n` number of trees in parallel. The `fn` callback member of
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* `traverse_info` is called once for each tree entry.
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*/
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int traverse_trees(struct index_state *istate, int n, struct tree_desc *t, struct traverse_info *info);
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enum get_oid_result get_tree_entry_follow_symlinks(struct repository *r, struct object_id *tree_oid, const char *name, struct object_id *result, struct strbuf *result_path, unsigned short *mode);
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/**
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* A structure used to maintain the state of a traversal.
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*/
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struct traverse_info {
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const char *traverse_path;
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/*
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* points to the traverse_info which was used to descend into the
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* current tree. If this is the top-level tree `prev` will point to
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* a dummy traverse_info.
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*/
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struct traverse_info *prev;
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/* is the entry for the current tree (if the tree is a subtree). */
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const char *name;
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size_t namelen;
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unsigned mode;
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/* is the length of the full path for the current tree. */
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size_t pathlen;
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struct pathspec *pathspec;
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/* can be used by callbacks to maintain directory-file conflicts. */
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unsigned long df_conflicts;
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/* a callback called for each entry in the tree.
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*
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* The arguments passed to the traverse callback are as follows:
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*
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* - `n` counts the number of trees being traversed.
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*
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* - `mask` has its nth bit set if something exists in the nth entry.
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*
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* - `dirmask` has its nth bit set if the nth tree's entry is a directory.
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*
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* - `entry` is an array of size `n` where the nth entry is from the nth tree.
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*
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* - `info` maintains the state of the traversal.
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*
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* Returning a negative value will terminate the traversal. Otherwise the
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* return value is treated as an update mask. If the nth bit is set the nth tree
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* will be updated and if the bit is not set the nth tree entry will be the
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* same in the next callback invocation.
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*/
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traverse_callback_t fn;
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/* can be anything the `fn` callback would want to use. */
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void *data;
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/* tells whether to stop at the first error or not. */
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int show_all_errors;
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};
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/**
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* Find an entry in a tree given a pathname and the sha1 of a tree to
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* search. Returns 0 if the entry is found and -1 otherwise. The third
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* and fourth parameters are set to the entry's sha1 and mode respectively.
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*/
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int get_tree_entry(struct repository *, const struct object_id *, const char *, struct object_id *, unsigned short *);
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/**
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* Generate the full pathname of a tree entry based from the root of the
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* traversal. For example, if the traversal has recursed into another
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* tree named "bar" the pathname of an entry "baz" in the "bar"
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* tree would be "bar/baz".
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*/
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char *make_traverse_path(char *path, size_t pathlen, const struct traverse_info *info,
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const char *name, size_t namelen);
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/**
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* Convenience wrapper to `make_traverse_path` into a strbuf.
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*/
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void strbuf_make_traverse_path(struct strbuf *out,
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const struct traverse_info *info,
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const char *name, size_t namelen);
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/**
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* Initialize a `traverse_info` given the pathname of the tree to start
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* traversing from.
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*/
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void setup_traverse_info(struct traverse_info *info, const char *base);
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/**
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* Calculate the length of a pathname returned by `make_traverse_path`.
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* This utilizes the memory structure of a tree entry to avoid the
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* overhead of using a generic strlen().
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*/
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static inline size_t traverse_path_len(const struct traverse_info *info,
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size_t namelen)
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{
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return st_add(info->pathlen, namelen);
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}
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/* in general, positive means "kind of interesting" */
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enum interesting {
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all_entries_not_interesting = -1, /* no, and no subsequent entries will be either */
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entry_not_interesting = 0,
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entry_interesting = 1,
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all_entries_interesting = 2 /* yes, and all subsequent entries will be */
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};
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enum interesting tree_entry_interesting(struct index_state *istate,
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const struct name_entry *,
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struct strbuf *,
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const struct pathspec *ps);
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#endif
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