git/trailer.c
Paolo Bonzini 0ea5292e6b interpret-trailers: add options for actions
Allow using non-default values for trailers without having to set
them up in .gitconfig first.  For example, if you have the following
configuration

     trailer.signed-off-by.where = end

you may use "--where before" when a patch author forgets his
Signed-off-by and provides it in a separate email.  Likewise for
--if-exists and --if-missing

Reverting to the behavior specified by .gitconfig is done with
--no-where, --no-if-exists and --no-if-missing.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-14 12:23:28 -07:00

1083 lines
27 KiB
C

#include "cache.h"
#include "config.h"
#include "string-list.h"
#include "run-command.h"
#include "commit.h"
#include "tempfile.h"
#include "trailer.h"
#include "list.h"
/*
* Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
*/
struct conf_info {
char *name;
char *key;
char *command;
enum trailer_where where;
enum trailer_if_exists if_exists;
enum trailer_if_missing if_missing;
};
static struct conf_info default_conf_info;
struct trailer_item {
struct list_head list;
/*
* If this is not a trailer line, the line is stored in value
* (excluding the terminating newline) and token is NULL.
*/
char *token;
char *value;
};
struct arg_item {
struct list_head list;
char *token;
char *value;
struct conf_info conf;
};
static LIST_HEAD(conf_head);
static char *separators = ":";
static int configured;
#define TRAILER_ARG_STRING "$ARG"
static const char *git_generated_prefixes[] = {
"Signed-off-by: ",
"(cherry picked from commit ",
NULL
};
/* Iterate over the elements of the list. */
#define list_for_each_dir(pos, head, is_reverse) \
for (pos = is_reverse ? (head)->prev : (head)->next; \
pos != (head); \
pos = is_reverse ? pos->prev : pos->next)
static int after_or_end(enum trailer_where where)
{
return (where == WHERE_AFTER) || (where == WHERE_END);
}
/*
* Return the length of the string not including any final
* punctuation. E.g., the input "Signed-off-by:" would return
* 13, stripping the trailing punctuation but retaining
* internal punctuation.
*/
static size_t token_len_without_separator(const char *token, size_t len)
{
while (len > 0 && !isalnum(token[len - 1]))
len--;
return len;
}
static int same_token(struct trailer_item *a, struct arg_item *b)
{
size_t a_len, b_len, min_len;
if (!a->token)
return 0;
a_len = token_len_without_separator(a->token, strlen(a->token));
b_len = token_len_without_separator(b->token, strlen(b->token));
min_len = (a_len > b_len) ? b_len : a_len;
return !strncasecmp(a->token, b->token, min_len);
}
static int same_value(struct trailer_item *a, struct arg_item *b)
{
return !strcasecmp(a->value, b->value);
}
static int same_trailer(struct trailer_item *a, struct arg_item *b)
{
return same_token(a, b) && same_value(a, b);
}
static inline int is_blank_line(const char *str)
{
const char *s = str;
while (*s && *s != '\n' && isspace(*s))
s++;
return !*s || *s == '\n';
}
static inline void strbuf_replace(struct strbuf *sb, const char *a, const char *b)
{
const char *ptr = strstr(sb->buf, a);
if (ptr)
strbuf_splice(sb, ptr - sb->buf, strlen(a), b, strlen(b));
}
static void free_trailer_item(struct trailer_item *item)
{
free(item->token);
free(item->value);
free(item);
}
static void free_arg_item(struct arg_item *item)
{
free(item->conf.name);
free(item->conf.key);
free(item->conf.command);
free(item->token);
free(item->value);
free(item);
}
static char last_non_space_char(const char *s)
{
int i;
for (i = strlen(s) - 1; i >= 0; i--)
if (!isspace(s[i]))
return s[i];
return '\0';
}
static void print_tok_val(FILE *outfile, const char *tok, const char *val)
{
char c;
if (!tok) {
fprintf(outfile, "%s\n", val);
return;
}
c = last_non_space_char(tok);
if (!c)
return;
if (strchr(separators, c))
fprintf(outfile, "%s%s\n", tok, val);
else
fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
}
static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
{
struct list_head *pos;
struct trailer_item *item;
list_for_each(pos, head) {
item = list_entry(pos, struct trailer_item, list);
if (!trim_empty || strlen(item->value) > 0)
print_tok_val(outfile, item->token, item->value);
}
}
static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok)
{
struct trailer_item *new = xcalloc(sizeof(*new), 1);
new->token = arg_tok->token;
new->value = arg_tok->value;
arg_tok->token = arg_tok->value = NULL;
free_arg_item(arg_tok);
return new;
}
static void add_arg_to_input_list(struct trailer_item *on_tok,
struct arg_item *arg_tok)
{
int aoe = after_or_end(arg_tok->conf.where);
struct trailer_item *to_add = trailer_from_arg(arg_tok);
if (aoe)
list_add(&to_add->list, &on_tok->list);
else
list_add_tail(&to_add->list, &on_tok->list);
}
static int check_if_different(struct trailer_item *in_tok,
struct arg_item *arg_tok,
int check_all,
struct list_head *head)
{
enum trailer_where where = arg_tok->conf.where;
struct list_head *next_head;
do {
if (same_trailer(in_tok, arg_tok))
return 0;
/*
* if we want to add a trailer after another one,
* we have to check those before this one
*/
next_head = after_or_end(where) ? in_tok->list.prev
: in_tok->list.next;
if (next_head == head)
break;
in_tok = list_entry(next_head, struct trailer_item, list);
} while (check_all);
return 1;
}
static char *apply_command(const char *command, const char *arg)
{
struct strbuf cmd = STRBUF_INIT;
struct strbuf buf = STRBUF_INIT;
struct child_process cp = CHILD_PROCESS_INIT;
const char *argv[] = {NULL, NULL};
char *result;
strbuf_addstr(&cmd, command);
if (arg)
strbuf_replace(&cmd, TRAILER_ARG_STRING, arg);
argv[0] = cmd.buf;
cp.argv = argv;
cp.env = local_repo_env;
cp.no_stdin = 1;
cp.use_shell = 1;
if (capture_command(&cp, &buf, 1024)) {
error(_("running trailer command '%s' failed"), cmd.buf);
strbuf_release(&buf);
result = xstrdup("");
} else {
strbuf_trim(&buf);
result = strbuf_detach(&buf, NULL);
}
strbuf_release(&cmd);
return result;
}
static void apply_item_command(struct trailer_item *in_tok, struct arg_item *arg_tok)
{
if (arg_tok->conf.command) {
const char *arg;
if (arg_tok->value && arg_tok->value[0]) {
arg = arg_tok->value;
} else {
if (in_tok && in_tok->value)
arg = xstrdup(in_tok->value);
else
arg = xstrdup("");
}
arg_tok->value = apply_command(arg_tok->conf.command, arg);
free((char *)arg);
}
}
static void apply_arg_if_exists(struct trailer_item *in_tok,
struct arg_item *arg_tok,
struct trailer_item *on_tok,
struct list_head *head)
{
switch (arg_tok->conf.if_exists) {
case EXISTS_DO_NOTHING:
free_arg_item(arg_tok);
break;
case EXISTS_REPLACE:
apply_item_command(in_tok, arg_tok);
add_arg_to_input_list(on_tok, arg_tok);
list_del(&in_tok->list);
free_trailer_item(in_tok);
break;
case EXISTS_ADD:
apply_item_command(in_tok, arg_tok);
add_arg_to_input_list(on_tok, arg_tok);
break;
case EXISTS_ADD_IF_DIFFERENT:
apply_item_command(in_tok, arg_tok);
if (check_if_different(in_tok, arg_tok, 1, head))
add_arg_to_input_list(on_tok, arg_tok);
else
free_arg_item(arg_tok);
break;
case EXISTS_ADD_IF_DIFFERENT_NEIGHBOR:
apply_item_command(in_tok, arg_tok);
if (check_if_different(on_tok, arg_tok, 0, head))
add_arg_to_input_list(on_tok, arg_tok);
else
free_arg_item(arg_tok);
break;
default:
die("BUG: trailer.c: unhandled value %d",
arg_tok->conf.if_exists);
}
}
static void apply_arg_if_missing(struct list_head *head,
struct arg_item *arg_tok)
{
enum trailer_where where;
struct trailer_item *to_add;
switch (arg_tok->conf.if_missing) {
case MISSING_DO_NOTHING:
free_arg_item(arg_tok);
break;
case MISSING_ADD:
where = arg_tok->conf.where;
apply_item_command(NULL, arg_tok);
to_add = trailer_from_arg(arg_tok);
if (after_or_end(where))
list_add_tail(&to_add->list, head);
else
list_add(&to_add->list, head);
break;
default:
die("BUG: trailer.c: unhandled value %d",
arg_tok->conf.if_missing);
}
}
static int find_same_and_apply_arg(struct list_head *head,
struct arg_item *arg_tok)
{
struct list_head *pos;
struct trailer_item *in_tok;
struct trailer_item *on_tok;
enum trailer_where where = arg_tok->conf.where;
int middle = (where == WHERE_AFTER) || (where == WHERE_BEFORE);
int backwards = after_or_end(where);
struct trailer_item *start_tok;
if (list_empty(head))
return 0;
start_tok = list_entry(backwards ? head->prev : head->next,
struct trailer_item,
list);
list_for_each_dir(pos, head, backwards) {
in_tok = list_entry(pos, struct trailer_item, list);
if (!same_token(in_tok, arg_tok))
continue;
on_tok = middle ? in_tok : start_tok;
apply_arg_if_exists(in_tok, arg_tok, on_tok, head);
return 1;
}
return 0;
}
static void process_trailers_lists(struct list_head *head,
struct list_head *arg_head)
{
struct list_head *pos, *p;
struct arg_item *arg_tok;
list_for_each_safe(pos, p, arg_head) {
int applied = 0;
arg_tok = list_entry(pos, struct arg_item, list);
list_del(pos);
applied = find_same_and_apply_arg(head, arg_tok);
if (!applied)
apply_arg_if_missing(head, arg_tok);
}
}
int trailer_set_where(enum trailer_where *item, const char *value)
{
if (!value)
*item = WHERE_DEFAULT;
else if (!strcasecmp("after", value))
*item = WHERE_AFTER;
else if (!strcasecmp("before", value))
*item = WHERE_BEFORE;
else if (!strcasecmp("end", value))
*item = WHERE_END;
else if (!strcasecmp("start", value))
*item = WHERE_START;
else
return -1;
return 0;
}
int trailer_set_if_exists(enum trailer_if_exists *item, const char *value)
{
if (!value)
*item = EXISTS_DEFAULT;
else if (!strcasecmp("addIfDifferent", value))
*item = EXISTS_ADD_IF_DIFFERENT;
else if (!strcasecmp("addIfDifferentNeighbor", value))
*item = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
else if (!strcasecmp("add", value))
*item = EXISTS_ADD;
else if (!strcasecmp("replace", value))
*item = EXISTS_REPLACE;
else if (!strcasecmp("doNothing", value))
*item = EXISTS_DO_NOTHING;
else
return -1;
return 0;
}
int trailer_set_if_missing(enum trailer_if_missing *item, const char *value)
{
if (!value)
*item = MISSING_DEFAULT;
else if (!strcasecmp("doNothing", value))
*item = MISSING_DO_NOTHING;
else if (!strcasecmp("add", value))
*item = MISSING_ADD;
else
return -1;
return 0;
}
static void duplicate_conf(struct conf_info *dst, const struct conf_info *src)
{
*dst = *src;
dst->name = xstrdup_or_null(src->name);
dst->key = xstrdup_or_null(src->key);
dst->command = xstrdup_or_null(src->command);
}
static struct arg_item *get_conf_item(const char *name)
{
struct list_head *pos;
struct arg_item *item;
/* Look up item with same name */
list_for_each(pos, &conf_head) {
item = list_entry(pos, struct arg_item, list);
if (!strcasecmp(item->conf.name, name))
return item;
}
/* Item does not already exists, create it */
item = xcalloc(sizeof(*item), 1);
duplicate_conf(&item->conf, &default_conf_info);
item->conf.name = xstrdup(name);
list_add_tail(&item->list, &conf_head);
return item;
}
enum trailer_info_type { TRAILER_KEY, TRAILER_COMMAND, TRAILER_WHERE,
TRAILER_IF_EXISTS, TRAILER_IF_MISSING };
static struct {
const char *name;
enum trailer_info_type type;
} trailer_config_items[] = {
{ "key", TRAILER_KEY },
{ "command", TRAILER_COMMAND },
{ "where", TRAILER_WHERE },
{ "ifexists", TRAILER_IF_EXISTS },
{ "ifmissing", TRAILER_IF_MISSING }
};
static int git_trailer_default_config(const char *conf_key, const char *value, void *cb)
{
const char *trailer_item, *variable_name;
if (!skip_prefix(conf_key, "trailer.", &trailer_item))
return 0;
variable_name = strrchr(trailer_item, '.');
if (!variable_name) {
if (!strcmp(trailer_item, "where")) {
if (trailer_set_where(&default_conf_info.where,
value) < 0)
warning(_("unknown value '%s' for key '%s'"),
value, conf_key);
} else if (!strcmp(trailer_item, "ifexists")) {
if (trailer_set_if_exists(&default_conf_info.if_exists,
value) < 0)
warning(_("unknown value '%s' for key '%s'"),
value, conf_key);
} else if (!strcmp(trailer_item, "ifmissing")) {
if (trailer_set_if_missing(&default_conf_info.if_missing,
value) < 0)
warning(_("unknown value '%s' for key '%s'"),
value, conf_key);
} else if (!strcmp(trailer_item, "separators")) {
separators = xstrdup(value);
}
}
return 0;
}
static int git_trailer_config(const char *conf_key, const char *value, void *cb)
{
const char *trailer_item, *variable_name;
struct arg_item *item;
struct conf_info *conf;
char *name = NULL;
enum trailer_info_type type;
int i;
if (!skip_prefix(conf_key, "trailer.", &trailer_item))
return 0;
variable_name = strrchr(trailer_item, '.');
if (!variable_name)
return 0;
variable_name++;
for (i = 0; i < ARRAY_SIZE(trailer_config_items); i++) {
if (strcmp(trailer_config_items[i].name, variable_name))
continue;
name = xstrndup(trailer_item, variable_name - trailer_item - 1);
type = trailer_config_items[i].type;
break;
}
if (!name)
return 0;
item = get_conf_item(name);
conf = &item->conf;
free(name);
switch (type) {
case TRAILER_KEY:
if (conf->key)
warning(_("more than one %s"), conf_key);
conf->key = xstrdup(value);
break;
case TRAILER_COMMAND:
if (conf->command)
warning(_("more than one %s"), conf_key);
conf->command = xstrdup(value);
break;
case TRAILER_WHERE:
if (trailer_set_where(&conf->where, value))
warning(_("unknown value '%s' for key '%s'"), value, conf_key);
break;
case TRAILER_IF_EXISTS:
if (trailer_set_if_exists(&conf->if_exists, value))
warning(_("unknown value '%s' for key '%s'"), value, conf_key);
break;
case TRAILER_IF_MISSING:
if (trailer_set_if_missing(&conf->if_missing, value))
warning(_("unknown value '%s' for key '%s'"), value, conf_key);
break;
default:
die("BUG: trailer.c: unhandled type %d", type);
}
return 0;
}
static void ensure_configured(void)
{
if (configured)
return;
/* Default config must be setup first */
default_conf_info.where = WHERE_END;
default_conf_info.if_exists = EXISTS_ADD_IF_DIFFERENT_NEIGHBOR;
default_conf_info.if_missing = MISSING_ADD;
git_config(git_trailer_default_config, NULL);
git_config(git_trailer_config, NULL);
configured = 1;
}
static const char *token_from_item(struct arg_item *item, char *tok)
{
if (item->conf.key)
return item->conf.key;
if (tok)
return tok;
return item->conf.name;
}
static int token_matches_item(const char *tok, struct arg_item *item, int tok_len)
{
if (!strncasecmp(tok, item->conf.name, tok_len))
return 1;
return item->conf.key ? !strncasecmp(tok, item->conf.key, tok_len) : 0;
}
/*
* If the given line is of the form
* "<token><optional whitespace><separator>..." or "<separator>...", return the
* location of the separator. Otherwise, return -1. The optional whitespace
* is allowed there primarily to allow things like "Bug #43" where <token> is
* "Bug" and <separator> is "#".
*
* The separator-starts-line case (in which this function returns 0) is
* distinguished from the non-well-formed-line case (in which this function
* returns -1) because some callers of this function need such a distinction.
*/
static int find_separator(const char *line, const char *separators)
{
int whitespace_found = 0;
const char *c;
for (c = line; *c; c++) {
if (strchr(separators, *c))
return c - line;
if (!whitespace_found && (isalnum(*c) || *c == '-'))
continue;
if (c != line && (*c == ' ' || *c == '\t')) {
whitespace_found = 1;
continue;
}
break;
}
return -1;
}
/*
* Obtain the token, value, and conf from the given trailer.
*
* separator_pos must not be 0, since the token cannot be an empty string.
*
* If separator_pos is -1, interpret the whole trailer as a token.
*/
static void parse_trailer(struct strbuf *tok, struct strbuf *val,
const struct conf_info **conf, const char *trailer,
int separator_pos)
{
struct arg_item *item;
int tok_len;
struct list_head *pos;
if (separator_pos != -1) {
strbuf_add(tok, trailer, separator_pos);
strbuf_trim(tok);
strbuf_addstr(val, trailer + separator_pos + 1);
strbuf_trim(val);
} else {
strbuf_addstr(tok, trailer);
strbuf_trim(tok);
}
/* Lookup if the token matches something in the config */
tok_len = token_len_without_separator(tok->buf, tok->len);
if (conf)
*conf = &default_conf_info;
list_for_each(pos, &conf_head) {
item = list_entry(pos, struct arg_item, list);
if (token_matches_item(tok->buf, item, tok_len)) {
char *tok_buf = strbuf_detach(tok, NULL);
if (conf)
*conf = &item->conf;
strbuf_addstr(tok, token_from_item(item, tok_buf));
free(tok_buf);
break;
}
}
}
static struct trailer_item *add_trailer_item(struct list_head *head, char *tok,
char *val)
{
struct trailer_item *new = xcalloc(sizeof(*new), 1);
new->token = tok;
new->value = val;
list_add_tail(&new->list, head);
return new;
}
static void add_arg_item(struct list_head *arg_head, char *tok, char *val,
const struct conf_info *conf,
const struct new_trailer_item *new_trailer_item)
{
struct arg_item *new = xcalloc(sizeof(*new), 1);
new->token = tok;
new->value = val;
duplicate_conf(&new->conf, conf);
if (new_trailer_item) {
if (new_trailer_item->where != WHERE_DEFAULT)
new->conf.where = new_trailer_item->where;
if (new_trailer_item->if_exists != EXISTS_DEFAULT)
new->conf.if_exists = new_trailer_item->if_exists;
if (new_trailer_item->if_missing != MISSING_DEFAULT)
new->conf.if_missing = new_trailer_item->if_missing;
}
list_add_tail(&new->list, arg_head);
}
static void process_command_line_args(struct list_head *arg_head,
struct list_head *new_trailer_head)
{
struct arg_item *item;
struct strbuf tok = STRBUF_INIT;
struct strbuf val = STRBUF_INIT;
const struct conf_info *conf;
struct list_head *pos;
/*
* In command-line arguments, '=' is accepted (in addition to the
* separators that are defined).
*/
char *cl_separators = xstrfmt("=%s", separators);
/* Add an arg item for each configured trailer with a command */
list_for_each(pos, &conf_head) {
item = list_entry(pos, struct arg_item, list);
if (item->conf.command)
add_arg_item(arg_head,
xstrdup(token_from_item(item, NULL)),
xstrdup(""),
&item->conf, NULL);
}
/* Add an arg item for each trailer on the command line */
list_for_each(pos, new_trailer_head) {
struct new_trailer_item *tr =
list_entry(pos, struct new_trailer_item, list);
int separator_pos = find_separator(tr->text, cl_separators);
if (separator_pos == 0) {
struct strbuf sb = STRBUF_INIT;
strbuf_addstr(&sb, tr->text);
strbuf_trim(&sb);
error(_("empty trailer token in trailer '%.*s'"),
(int) sb.len, sb.buf);
strbuf_release(&sb);
} else {
parse_trailer(&tok, &val, &conf, tr->text,
separator_pos);
add_arg_item(arg_head,
strbuf_detach(&tok, NULL),
strbuf_detach(&val, NULL),
conf, tr);
}
}
free(cl_separators);
}
static void read_input_file(struct strbuf *sb, const char *file)
{
if (file) {
if (strbuf_read_file(sb, file, 0) < 0)
die_errno(_("could not read input file '%s'"), file);
} else {
if (strbuf_read(sb, fileno(stdin), 0) < 0)
die_errno(_("could not read from stdin"));
}
}
static const char *next_line(const char *str)
{
const char *nl = strchrnul(str, '\n');
return nl + !!*nl;
}
/*
* Return the position of the start of the last line. If len is 0, return -1.
*/
static int last_line(const char *buf, size_t len)
{
int i;
if (len == 0)
return -1;
if (len == 1)
return 0;
/*
* Skip the last character (in addition to the null terminator),
* because if the last character is a newline, it is considered as part
* of the last line anyway.
*/
i = len - 2;
for (; i >= 0; i--) {
if (buf[i] == '\n')
return i + 1;
}
return 0;
}
/*
* Return the position of the start of the patch or the length of str if there
* is no patch in the message.
*/
static int find_patch_start(const char *str)
{
const char *s;
for (s = str; *s; s = next_line(s)) {
if (starts_with(s, "---"))
return s - str;
}
return s - str;
}
/*
* Return the position of the first trailer line or len if there are no
* trailers.
*/
static int find_trailer_start(const char *buf, size_t len)
{
const char *s;
int end_of_title, l, only_spaces = 1;
int recognized_prefix = 0, trailer_lines = 0, non_trailer_lines = 0;
/*
* Number of possible continuation lines encountered. This will be
* reset to 0 if we encounter a trailer (since those lines are to be
* considered continuations of that trailer), and added to
* non_trailer_lines if we encounter a non-trailer (since those lines
* are to be considered non-trailers).
*/
int possible_continuation_lines = 0;
/* The first paragraph is the title and cannot be trailers */
for (s = buf; s < buf + len; s = next_line(s)) {
if (s[0] == comment_line_char)
continue;
if (is_blank_line(s))
break;
}
end_of_title = s - buf;
/*
* Get the start of the trailers by looking starting from the end for a
* blank line before a set of non-blank lines that (i) are all
* trailers, or (ii) contains at least one Git-generated trailer and
* consists of at least 25% trailers.
*/
for (l = last_line(buf, len);
l >= end_of_title;
l = last_line(buf, l)) {
const char *bol = buf + l;
const char **p;
int separator_pos;
if (bol[0] == comment_line_char) {
non_trailer_lines += possible_continuation_lines;
possible_continuation_lines = 0;
continue;
}
if (is_blank_line(bol)) {
if (only_spaces)
continue;
non_trailer_lines += possible_continuation_lines;
if (recognized_prefix &&
trailer_lines * 3 >= non_trailer_lines)
return next_line(bol) - buf;
else if (trailer_lines && !non_trailer_lines)
return next_line(bol) - buf;
return len;
}
only_spaces = 0;
for (p = git_generated_prefixes; *p; p++) {
if (starts_with(bol, *p)) {
trailer_lines++;
possible_continuation_lines = 0;
recognized_prefix = 1;
goto continue_outer_loop;
}
}
separator_pos = find_separator(bol, separators);
if (separator_pos >= 1 && !isspace(bol[0])) {
struct list_head *pos;
trailer_lines++;
possible_continuation_lines = 0;
if (recognized_prefix)
continue;
list_for_each(pos, &conf_head) {
struct arg_item *item;
item = list_entry(pos, struct arg_item, list);
if (token_matches_item(bol, item,
separator_pos)) {
recognized_prefix = 1;
break;
}
}
} else if (isspace(bol[0]))
possible_continuation_lines++;
else {
non_trailer_lines++;
non_trailer_lines += possible_continuation_lines;
possible_continuation_lines = 0;
}
continue_outer_loop:
;
}
return len;
}
/* Return the position of the end of the trailers. */
static int find_trailer_end(const char *buf, size_t len)
{
return len - ignore_non_trailer(buf, len);
}
static int ends_with_blank_line(const char *buf, size_t len)
{
int ll = last_line(buf, len);
if (ll < 0)
return 0;
return is_blank_line(buf + ll);
}
static int process_input_file(FILE *outfile,
const char *str,
struct list_head *head)
{
struct trailer_info info;
struct strbuf tok = STRBUF_INIT;
struct strbuf val = STRBUF_INIT;
int i;
trailer_info_get(&info, str);
/* Print lines before the trailers as is */
fwrite(str, 1, info.trailer_start - str, outfile);
if (!info.blank_line_before_trailer)
fprintf(outfile, "\n");
for (i = 0; i < info.trailer_nr; i++) {
int separator_pos;
char *trailer = info.trailers[i];
if (trailer[0] == comment_line_char)
continue;
separator_pos = find_separator(trailer, separators);
if (separator_pos >= 1) {
parse_trailer(&tok, &val, NULL, trailer,
separator_pos);
add_trailer_item(head,
strbuf_detach(&tok, NULL),
strbuf_detach(&val, NULL));
} else {
strbuf_addstr(&val, trailer);
strbuf_strip_suffix(&val, "\n");
add_trailer_item(head,
NULL,
strbuf_detach(&val, NULL));
}
}
trailer_info_release(&info);
return info.trailer_end - str;
}
static void free_all(struct list_head *head)
{
struct list_head *pos, *p;
list_for_each_safe(pos, p, head) {
list_del(pos);
free_trailer_item(list_entry(pos, struct trailer_item, list));
}
}
static struct tempfile trailers_tempfile;
static FILE *create_in_place_tempfile(const char *file)
{
struct stat st;
struct strbuf template = STRBUF_INIT;
const char *tail;
FILE *outfile;
if (stat(file, &st))
die_errno(_("could not stat %s"), file);
if (!S_ISREG(st.st_mode))
die(_("file %s is not a regular file"), file);
if (!(st.st_mode & S_IWUSR))
die(_("file %s is not writable by user"), file);
/* Create temporary file in the same directory as the original */
tail = strrchr(file, '/');
if (tail != NULL)
strbuf_add(&template, file, tail - file + 1);
strbuf_addstr(&template, "git-interpret-trailers-XXXXXX");
xmks_tempfile_m(&trailers_tempfile, template.buf, st.st_mode);
strbuf_release(&template);
outfile = fdopen_tempfile(&trailers_tempfile, "w");
if (!outfile)
die_errno(_("could not open temporary file"));
return outfile;
}
void process_trailers(const char *file, int in_place, int trim_empty,
struct list_head *new_trailer_head)
{
LIST_HEAD(head);
LIST_HEAD(arg_head);
struct strbuf sb = STRBUF_INIT;
int trailer_end;
FILE *outfile = stdout;
ensure_configured();
read_input_file(&sb, file);
if (in_place)
outfile = create_in_place_tempfile(file);
/* Print the lines before the trailers */
trailer_end = process_input_file(outfile, sb.buf, &head);
process_command_line_args(&arg_head, new_trailer_head);
process_trailers_lists(&head, &arg_head);
print_all(outfile, &head, trim_empty);
free_all(&head);
/* Print the lines after the trailers as is */
fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
if (in_place)
if (rename_tempfile(&trailers_tempfile, file))
die_errno(_("could not rename temporary file to %s"), file);
strbuf_release(&sb);
}
void trailer_info_get(struct trailer_info *info, const char *str)
{
int patch_start, trailer_end, trailer_start;
struct strbuf **trailer_lines, **ptr;
char **trailer_strings = NULL;
size_t nr = 0, alloc = 0;
char **last = NULL;
ensure_configured();
patch_start = find_patch_start(str);
trailer_end = find_trailer_end(str, patch_start);
trailer_start = find_trailer_start(str, trailer_end);
trailer_lines = strbuf_split_buf(str + trailer_start,
trailer_end - trailer_start,
'\n',
0);
for (ptr = trailer_lines; *ptr; ptr++) {
if (last && isspace((*ptr)->buf[0])) {
struct strbuf sb = STRBUF_INIT;
strbuf_attach(&sb, *last, strlen(*last), strlen(*last));
strbuf_addbuf(&sb, *ptr);
*last = strbuf_detach(&sb, NULL);
continue;
}
ALLOC_GROW(trailer_strings, nr + 1, alloc);
trailer_strings[nr] = strbuf_detach(*ptr, NULL);
last = find_separator(trailer_strings[nr], separators) >= 1
? &trailer_strings[nr]
: NULL;
nr++;
}
strbuf_list_free(trailer_lines);
info->blank_line_before_trailer = ends_with_blank_line(str,
trailer_start);
info->trailer_start = str + trailer_start;
info->trailer_end = str + trailer_end;
info->trailers = trailer_strings;
info->trailer_nr = nr;
}
void trailer_info_release(struct trailer_info *info)
{
int i;
for (i = 0; i < info->trailer_nr; i++)
free(info->trailers[i]);
free(info->trailers);
}