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#define USE_THE_REPOSITORY_VARIABLE

#include "builtin.h"

#include "config.h"

#include "diff.h"

#include "environment.h"

#include "gettext.h"

#include "hash.h"

#include "hex.h"

#include "parse-options.h"

#include "setup.h"

static void flush_current_id(size_t patchlen, struct object_id *id, struct object_id *result)

{

if (patchlen)

printf("%s %s\n", oid_to_hex(result), oid_to_hex(id));

}

static size_t remove_space(char *line)

{

char *src = line;

char *dst = line;

unsigned char c;

while ((c = *src++) != '\0') {

if (!isspace(c))

*dst++ = c;

}

return dst - line;

}

static int scan_hunk_header(const char *p, int *p_before, int *p_after)

{

static const char digits[] = "0123456789";

const char *q, *r;

int n;

q = p + 4;

n = strspn(q, digits);

if (q[n] == ',') {

q += n + 1;

*p_before = atoi(q);

n = strspn(q, digits);

} else {

*p_before = 1;

}

if (n == 0 || q[n] != ' ' || q[n+1] != '+')

return 0;

r = q + n + 2;

n = strspn(r, digits);

if (r[n] == ',') {

r += n + 1;

*p_after = atoi(r);

n = strspn(r, digits);

} else {

*p_after = 1;

}

if (n == 0)

return 0;

return 1;

}

static size_t get_one_patchid(struct object_id *next_oid, struct object_id *result,

struct strbuf *line_buf, int stable, int verbatim)

{

size_t patchlen = 0;

int found_next = 0;

int before = -1, after = -1;

int diff_is_binary = 0;

char pre_oid_str[GIT_MAX_HEXSZ + 1], post_oid_str[GIT_MAX_HEXSZ + 1];

struct git_hash_ctx ctx;

the_hash_algo->init_fn(&ctx);

oidclr(result, the_repository->hash_algo);

while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {

char *line = line_buf->buf;

const char *p = line;

size_t len;

/* Possibly skip over the prefix added by "log" or "format-patch" */

if (!skip_prefix(line, "commit ", &p) &&

!skip_prefix(line, "From ", &p) &&

starts_with(line, "\\ ") && 12 < strlen(line)) {

if (verbatim)

git_hash_update(&ctx, line, strlen(line));

continue;

}

if (!get_oid_hex(p, next_oid)) {

found_next = 1;

break;

}

/* Ignore commit comments */

if (!patchlen && !starts_with(line, "diff "))

continue;

/* Parsing diff header? */

if (before == -1) {

if (starts_with(line, "GIT binary patch") ||

starts_with(line, "Binary files")) {

diff_is_binary = 1;

before = 0;

git_hash_update(&ctx, pre_oid_str,

strlen(pre_oid_str));

git_hash_update(&ctx, post_oid_str,

strlen(post_oid_str));

if (stable)

flush_one_hunk(result, &ctx);

continue;

} else if (skip_prefix(line, "index ", &p)) {

char *oid1_end = strstr(line, "..");

char *oid2_end = NULL;

if (oid1_end)

oid2_end = strstr(oid1_end, " ");

if (!oid2_end)

oid2_end = line + strlen(line) - 1;

if (oid1_end != NULL && oid2_end != NULL) {

*oid1_end = *oid2_end = '\0';

strlcpy(pre_oid_str, p, GIT_MAX_HEXSZ + 1);

strlcpy(post_oid_str, oid1_end + 2, GIT_MAX_HEXSZ + 1);

}

continue;

} else if (starts_with(line, "--- "))

before = after = 1;

else if (!isalpha(line[0]))

break;

}

if (diff_is_binary) {

if (starts_with(line, "diff ")) {

diff_is_binary = 0;

before = -1;

}

continue;

}

/* Looking for a valid hunk header? */

if (before == 0 && after == 0) {

if (starts_with(line, "@@ -")) {

/* Parse next hunk, but ignore line numbers. */

scan_hunk_header(line, &before, &after);

continue;

}

/* Split at the end of the patch. */

if (!starts_with(line, "diff "))

break;

/* Else we're parsing another header. */

if (stable)

flush_one_hunk(result, &ctx);

before = after = -1;

}

/* If we get here, we're inside a hunk. */

if (line[0] == '-' || line[0] == ' ')

before--;

if (line[0] == '+' || line[0] == ' ')

after--;

/* Add line to hash algo (possibly removing whitespace) */

len = verbatim ? strlen(line) : remove_space(line);

patchlen += len;

git_hash_update(&ctx, line, len);

}

if (!found_next)

oidclr(next_oid, the_repository->hash_algo);

flush_one_hunk(result, &ctx);

return patchlen;

}

static void generate_id_list(int stable, int verbatim)

{

struct object_id oid, n, result;

size_t patchlen;

struct strbuf line_buf = STRBUF_INIT;

oidclr(&oid, the_repository->hash_algo);

while (!feof(stdin)) {

patchlen = get_one_patchid(&n, &result, &line_buf, stable, verbatim);

flush_current_id(patchlen, &oid, &result);

oidcpy(&oid, &n);

}

strbuf_release(&line_buf);

}

static const char *const patch_id_usage[] = {

N_("git patch-id [--stable | --unstable | --verbatim]"), NULL

};

struct patch_id_opts {

int stable;

int verbatim;

};

static int git_patch_id_config(const char *var, const char *value,

const struct config_context *ctx, void *cb)

{

struct patch_id_opts *opts = cb;

if (!strcmp(var, "patchid.stable")) {

opts->stable = git_config_bool(var, value);

return 0;

}

if (!strcmp(var, "patchid.verbatim")) {

opts->verbatim = git_config_bool(var, value);

return 0;

}

return git_default_config(var, value, ctx, cb);

}

int cmd_patch_id(int argc,

const char **argv,

const char *prefix,

struct repository *repo UNUSED)

{

/* if nothing is set, default to unstable */

struct patch_id_opts config = {0, 0};

int opts = 0;

struct option builtin_patch_id_options[] = {

OPT_CMDMODE(0, "unstable", &opts,

N_("use the unstable patch ID algorithm"), 1),

OPT_CMDMODE(0, "stable", &opts,

N_("use the stable patch ID algorithm"), 2),

OPT_CMDMODE(0, "verbatim", &opts,

N_("don't strip whitespace from the patch"), 3),

OPT_END()

};

repo_config(the_repository, git_patch_id_config, &config);

/* verbatim implies stable */

if (config.verbatim)

config.stable = 1;

argc = parse_options(argc, argv, prefix, builtin_patch_id_options,

patch_id_usage, 0);

/*

* We rely on `the_hash_algo` to compute patch IDs. This is dubious as

* it means that the hash algorithm now depends on the object hash of

* the repository, even though git-patch-id(1) clearly defines that

* patch IDs always use SHA1.

*

* NEEDSWORK: This hack should be removed in favor of converting

* the code that computes patch IDs to always use SHA1.

*/

if (!the_hash_algo)

repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);

generate_id_list(opts ? opts > 1 : config.stable,

opts ? opts == 3 : config.verbatim);

return 0;

}