diff options
Diffstat (limited to 'trailer.c')
| -rw-r--r-- | trailer.c | 1187 |
1 files changed, 1187 insertions, 0 deletions
diff --git a/trailer.c b/trailer.c new file mode 100644 index 000000000000..0c414f2fed2b --- /dev/null +++ b/trailer.c @@ -0,0 +1,1187 @@ +#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, + const struct process_trailer_options *opts) +{ + struct list_head *pos; + struct trailer_item *item; + list_for_each(pos, head) { + item = list_entry(pos, struct trailer_item, list); + if ((!opts->trim_empty || strlen(item->value) > 0) && + (!opts->only_trailers || item->token)) + print_tok_val(outfile, item->token, item->value); + } +} + +static struct trailer_item *trailer_from_arg(struct arg_item *arg_tok) +{ + struct trailer_item *new_item = xcalloc(sizeof(*new_item), 1); + new_item->token = arg_tok->token; + new_item->value = arg_tok->value; + arg_tok->token = arg_tok->value = NULL; + free_arg_item(arg_tok); + return new_item; +} + +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: + 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: + 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: + 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, size_t 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 ssize_t 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, + ssize_t separator_pos) +{ + struct arg_item *item; + size_t 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_item = xcalloc(sizeof(*new_item), 1); + new_item->token = tok; + new_item->value = val; + list_add_tail(&new_item->list, head); + return new_item; +} + +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_item = xcalloc(sizeof(*new_item), 1); + new_item->token = tok; + new_item->value = val; + duplicate_conf(&new_item->conf, conf); + if (new_trailer_item) { + if (new_trailer_item->where != WHERE_DEFAULT) + new_item->conf.where = new_trailer_item->where; + if (new_trailer_item->if_exists != EXISTS_DEFAULT) + new_item->conf.if_exists = new_trailer_item->if_exists; + if (new_trailer_item->if_missing != MISSING_DEFAULT) + new_item->conf.if_missing = new_trailer_item->if_missing; + } + list_add_tail(&new_item->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); + ssize_t 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 ssize_t last_line(const char *buf, size_t len) +{ + ssize_t 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 size_t find_patch_start(const char *str) +{ + const char *s; + + for (s = str; *s; s = next_line(s)) { + const char *v; + + if (skip_prefix(s, "---", &v) && isspace(*v)) + return s - str; + } + + return s - str; +} + +/* + * Return the position of the first trailer line or len if there are no + * trailers. + */ +static size_t find_trailer_start(const char *buf, size_t len) +{ + const char *s; + ssize_t end_of_title, l; + int 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; + ssize_t 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 size_t 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) +{ + ssize_t ll = last_line(buf, len); + if (ll < 0) + return 0; + return is_blank_line(buf + ll); +} + +static void unfold_value(struct strbuf *val) +{ + struct strbuf out = STRBUF_INIT; + size_t i; + + strbuf_grow(&out, val->len); + i = 0; + while (i < val->len) { + char c = val->buf[i++]; + if (c == '\n') { + /* Collapse continuation down to a single space. */ + while (i < val->len && isspace(val->buf[i])) + i++; + strbuf_addch(&out, ' '); + } else { + strbuf_addch(&out, c); + } + } + + /* Empty lines may have left us with whitespace cruft at the edges */ + strbuf_trim(&out); + + /* output goes back to val as if we modified it in-place */ + strbuf_swap(&out, val); + strbuf_release(&out); +} + +static size_t process_input_file(FILE *outfile, + const char *str, + struct list_head *head, + const struct process_trailer_options *opts) +{ + struct trailer_info info; + struct strbuf tok = STRBUF_INIT; + struct strbuf val = STRBUF_INIT; + size_t i; + + trailer_info_get(&info, str, opts); + + /* Print lines before the trailers as is */ + if (!opts->only_trailers) + fwrite(str, 1, info.trailer_start - str, outfile); + + if (!opts->only_trailers && !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); + if (opts->unfold) + unfold_value(&val); + add_trailer_item(head, + strbuf_detach(&tok, NULL), + strbuf_detach(&val, NULL)); + } else if (!opts->only_trailers) { + 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 filename_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(&filename_template, file, tail - file + 1); + strbuf_addstr(&filename_template, "git-interpret-trailers-XXXXXX"); + + trailers_tempfile = xmks_tempfile_m(filename_template.buf, st.st_mode); + strbuf_release(&filename_template); + outfile = fdopen_tempfile(trailers_tempfile, "w"); + if (!outfile) + die_errno(_("could not open temporary file")); + + return outfile; +} + +void process_trailers(const char *file, + const struct process_trailer_options *opts, + struct list_head *new_trailer_head) +{ + LIST_HEAD(head); + struct strbuf sb = STRBUF_INIT; + size_t trailer_end; + FILE *outfile = stdout; + + ensure_configured(); + + read_input_file(&sb, file); + + if (opts->in_place) + outfile = create_in_place_tempfile(file); + + /* Print the lines before the trailers */ + trailer_end = process_input_file(outfile, sb.buf, &head, opts); + + if (!opts->only_input) { + LIST_HEAD(arg_head); + process_command_line_args(&arg_head, new_trailer_head); + process_trailers_lists(&head, &arg_head); + } + + print_all(outfile, &head, opts); + + free_all(&head); + + /* Print the lines after the trailers as is */ + if (!opts->only_trailers) + fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile); + + if (opts->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, + const struct process_trailer_options *opts) +{ + 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(); + + if (opts->no_divider) + patch_start = strlen(str); + else + 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) +{ + size_t i; + for (i = 0; i < info->trailer_nr; i++) + free(info->trailers[i]); + free(info->trailers); +} + +static void format_trailer_info(struct strbuf *out, + const struct trailer_info *info, + const struct process_trailer_options *opts) +{ + size_t origlen = out->len; + size_t i; + + /* If we want the whole block untouched, we can take the fast path. */ + if (!opts->only_trailers && !opts->unfold && !opts->filter && !opts->separator) { + strbuf_add(out, info->trailer_start, + info->trailer_end - info->trailer_start); + return; + } + + for (i = 0; i < info->trailer_nr; i++) { + char *trailer = info->trailers[i]; + ssize_t separator_pos = find_separator(trailer, separators); + + if (separator_pos >= 1) { + struct strbuf tok = STRBUF_INIT; + struct strbuf val = STRBUF_INIT; + + parse_trailer(&tok, &val, NULL, trailer, separator_pos); + if (!opts->filter || opts->filter(&tok, opts->filter_data)) { + if (opts->unfold) + unfold_value(&val); + + if (opts->separator && out->len != origlen) + strbuf_addbuf(out, opts->separator); + if (!opts->value_only) + strbuf_addf(out, "%s: ", tok.buf); + strbuf_addbuf(out, &val); + if (!opts->separator) + strbuf_addch(out, '\n'); + } + strbuf_release(&tok); + strbuf_release(&val); + + } else if (!opts->only_trailers) { + if (opts->separator && out->len != origlen) { + strbuf_addbuf(out, opts->separator); + } + strbuf_addstr(out, trailer); + if (opts->separator) { + strbuf_rtrim(out); + } + } + } + +} + +void format_trailers_from_commit(struct strbuf *out, const char *msg, + const struct process_trailer_options *opts) +{ + struct trailer_info info; + + trailer_info_get(&info, msg, opts); + format_trailer_info(out, &info, opts); + trailer_info_release(&info); +} |