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/*

* Utilities library for libgit2 examples

*

* Written by the libgit2 contributors

*

* To the extent possible under law, the author(s) have dedicated all copyright

* and related and neighboring rights to this software to the public domain

* worldwide. This software is distributed without any warranty.

*

* You should have received a copy of the CC0 Public Domain Dedication along

* with this software. If not, see

* <http://creativecommons.org/publicdomain/zero/1.0/>.

*/

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <git2.h>

/**

* Check libgit2 error code, printing error to stderr on failure and

* exiting the program.

*/

extern void check_lg2(int error, const char *message, const char *extra);

/**

* Exit the program, printing error to stderr

*/

extern void fatal(const char *message, const char *extra);

/**

* Check if a string has the given prefix. Returns 0 if not prefixed

* or the length of the prefix if it is.

*/

extern size_t is_prefixed(const char *str, const char *pfx);

/**

* Match an integer string, returning 1 if matched, 0 if not.

*/

extern int is_integer(int *out, const char *str, int allow_negative);

struct args_info {

int argc;

char **argv;

int pos;

};

#define ARGS_INFO_INIT { argc, argv, 0 }

/**

* Check current `args` entry against `opt` string. If it matches

* exactly, take the next arg as a string; if it matches as a prefix with

* an equal sign, take the remainder as a string; if value not supplied,

* default value `def` will be given. otherwise return 0.

*/

extern int optional_str_arg(

const char **out, struct args_info *args, const char *opt, const char *def);

/**

* Check current `args` entry against `opt` string. If it matches

* exactly, take the next arg as a string; if it matches as a prefix with

* an equal sign, take the remainder as a string; otherwise return 0.

*/

extern int match_str_arg(

const char **out, struct args_info *args, const char *opt);

/**

* Check current `args` entry against `opt` string parsing as uint16. If

* `opt` matches exactly, take the next arg as a uint16_t value; if `opt`

* is a prefix (equal sign optional), take the remainder of the arg as a

* uint16_t value; otherwise return 0.

*/

extern int match_uint16_arg(

uint16_t *out, struct args_info *args, const char *opt);

/**

* Check current `args` entry against `opt` string parsing as uint32. If

* `opt` matches exactly, take the next arg as a uint16_t value; if `opt`

* is a prefix (equal sign optional), take the remainder of the arg as a

* uint32_t value; otherwise return 0.

*/

extern int match_uint32_arg(

uint32_t *out, struct args_info *args, const char *opt);

/**

* Check current `args` entry against `opt` string parsing as int. If

* `opt` matches exactly, take the next arg as an int value; if it matches

* as a prefix (equal sign optional), take the remainder of the arg as a

* int value; otherwise return 0.

*/

extern int match_int_arg(

int *out, struct args_info *args, const char *opt, int allow_negative);

/**

* Basic output function for plain text diff output

* Pass `FILE*` such as `stdout` or `stderr` as payload (or NULL == `stdout`)

*/

extern int diff_output(

const git_diff_delta*, const git_diff_hunk*, const git_diff_line*, void*);

/**

* Convert a treeish argument to an actual tree; this will call check_lg2

* and exit the program if `treeish` cannot be resolved to a tree

*/

extern void treeish_to_tree(

git_tree **out, git_repository *repo, const char *treeish);