/*
 * The helpers that belong to no single page. Repository registration, the
 * lifetimes of the reference and commit records the renderers build, thin
 * wrappers over git's diff machinery, and a handful of string, date and
 * mimetype utilities all live here because several renderers need them. The
 * two process-wide globals, ctx and cgit_repolist, are defined here as well.
 */

#ifndef CGIT_SHARED_H
#define CGIT_SHARED_H

#include "cgit.h"

extern char *cgit_default_repo_desc;

typedef void (*filepair_fn)(struct diff_filepair *pair);
typedef void (*linediff_fn)(char *line, int len);

/*
 * Each of these returns its argument untouched when the syscall it wraps
 * succeeded, and dies with the message and errno otherwise.
 */
extern int cgit_die_unless_zero(int result, const char *msg);
extern int cgit_die_unless_positive(int result, const char *msg);
extern int cgit_die_unless_non_negative(int result, const char *msg);

/*
 * Append a repository to cgit_repolist and return it, seeded from the current
 * global configuration. The returned pointer is invalidated by the next call,
 * because the list grows by reallocation.
 */
extern struct cgit_repo *cgit_add_repo(const char *url);
extern struct cgit_repo *cgit_get_repoinfo(const char *url);

/*
 * Export the CGIT_REPO_* variables that filters and hooks read.
 */
extern void cgit_prepare_repo_env(struct cgit_repo *repo);

extern void cgit_free_reflist_inner(struct reflist *list);

/*
 * Matches git's reference iteration callback, and appends each ref it is given
 * to the struct reflist passed as cb_data.
 */
extern int cgit_refs_cb(const struct reference *ref, void *cb_data);

extern void cgit_free_commitinfo(struct commitinfo *info);
extern void cgit_free_taginfo(struct taginfo *info);

extern void cgit_diff_tree_cb(struct diff_queue_struct *q, struct diff_options *options, void *data);

/*
 * Diff two blobs and hand fn one line at a time. Returns non-zero when either
 * blob could not be read. A blob that is binary or larger than max-blob-size
 * sets binary instead, and produces no lines, so the caller can offer a link
 * in place of the content.
 */
extern int cgit_diff_files(const struct object_id *old_oid, const struct object_id *new_oid,
	unsigned long *old_size, unsigned long *new_size, int *binary, int context, int ignorews,
	linediff_fn fn);

extern void cgit_diff_tree(const struct object_id *old_oid, const struct object_id *new_oid,
	filepair_fn fn, const char *prefix, int ignorews);
extern void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix);

/*
 * Accept only the date formats cgit documents, leaving mode unchanged for
 * anything else.
 */
extern void cgit_parse_date_format(const char *format, struct date_mode *mode);

/*
 * Copy str without its trailing runs of c, returning NULL if nothing is left.
 */
extern char *cgit_trim_end(const char *str, char c);
extern char *cgit_ensure_end(const char *str, char c);
extern void strbuf_ensure_end(struct strbuf *sb, char c);

/*
 * Read the first line of a file into a newly allocated, zero terminated
 * buffer. Returns 0 on success and an errno value otherwise.
 */
extern int cgit_read_first_line(const char *path, char **buf, size_t *size);
extern char *cgit_strdup_first_line(const char *text);

/*
 * Replace every $token in text with the matching environment variable. The
 * result is a static buffer, so a caller that needs to keep it must copy it.
 */
extern char *cgit_expand_macros(const char *text);

extern char *cgit_get_mimetype_for_filename(const char *filename);

/*
 * Whether a revision from the request is a hex object id or a possible ref
 * name, the only forms cgit hands to git.
 */
extern int cgit_valid_rev(const char *rev);

#endif // CGIT_SHARED_H