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#include <assert.h>
#include <errno.h>
#include <sqlite3.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#define DATABASE_PATH (FTAG_ROOT "/ftag.sqlite3")
struct ftag_command {
const char *name;
void (*func)(int argc, char **argv);
};
static void ftag_init(int, char **);
static void ftag_help(int, char **);
static void ftag_tag(int, char **);
/* Parse arguments using an array of available commands. ARGV[0] has to match
* the "name" field of an entry of COMMANDS. */
static void parse_args(int argc,
char ** argv,
const struct ftag_command *commands,
int command_count);
static const struct ftag_command toplevel_commands[] = {
{.name = "init", .func = ftag_init},
{.name = "help", .func = ftag_help},
{.name = "tag", .func = ftag_tag}
};
static const int toplevel_command_count = sizeof(toplevel_commands) / sizeof(struct ftag_command);
static void __sqlite3_check(int rc, sqlite3 *db, const char *file, int line, const char *func)
{
if (rc == SQLITE_OK)
return;
fprintf(stderr, "%s:%d: %s: %s\n", file, line, func, sqlite3_errmsg(db));
sqlite3_close(db);
exit(EXIT_FAILURE);
}
#define sqlite3_check(RC, DB) __sqlite3_check(RC, DB, __FILE__, __LINE__, __func__)
static void assert_db_exists(void)
{
struct stat statbuf __attribute__((unused));
int rc = stat(DATABASE_PATH, &statbuf);
if (rc == 0)
return;
if (errno == ENOENT) {
fprintf(stderr,
"ftag: database not found at \"%s\", "
"have you run \"ftag init\"?\n",
DATABASE_PATH);
}
else {
perror(DATABASE_PATH);
}
exit(EXIT_FAILURE);
}
static void ftag_init(int, char **)
{
char cmd[1024];
memset(cmd, 0, sizeof(cmd));
snprintf(cmd, sizeof(cmd)-1,
"sqlite3 %s < %s", DATABASE_PATH, FTAG_ROOT "/sql/init.sql");
execl("/usr/bin/sh", "/usr/bin/sh", "-c", cmd, NULL);
perror("exec");
exit(EXIT_FAILURE);
}
static void ftag_help(int, char **)
{
printf("Usage: ftag COMMAND [COMMAND-ARG]...\n");
printf("Available values for COMMAND:\n");
printf(" init initialize the database\n");
printf(" file manage files");
printf(" help print this message\n");
printf(" tag manage tags\n");
printf("Configuration:\n");
printf(" database path %s\n", DATABASE_PATH);
printf(" ftag root %s\n", FTAG_ROOT);
}
/* Check that the tag we are trying to create does not exist yet. If this
* callback is ever called, then it already exist, this is a fatal error. */
static int ftag_tag_check(void *, int, char **cols, char **)
{
assert(cols[0]);
assert(cols[1]);
fprintf(stderr,
"ftag tag add: error: tag \"%s\" already exists, its description is:\n",
cols[0]);
fprintf(stderr, "%s\n", cols[1]);
return 1;
}
static int ftag_tag_last_id(void *_id, int, char **cols, char **)
{
int *id = _id;
assert(cols);
assert(cols[0]);
*id = atoi(cols[0]);
return 0;
}
static void ftag_tag_add(int argc, char **argv)
{
if (argc != 2) {
fprintf(stderr,
"ftag tag add: error: must supply two arguments, "
"the tag name and its description\n");
exit(EXIT_FAILURE);
}
const char *new_tag_name = argv[0];
assert(strlen(new_tag_name) <= 255);
assert(strchr(new_tag_name, '\'') == NULL);
char sql[1024];
sqlite3 *db = NULL;
int rc;
rc = sqlite3_open(DATABASE_PATH, &db);
sqlite3_check(rc, db);
memset(sql, 0, sizeof(sql));
snprintf(sql, sizeof(sql)-1,
"SELECT name, description FROM tags WHERE name = '%s';", new_tag_name);
rc = sqlite3_exec(db, sql, ftag_tag_check, NULL, NULL);
sqlite3_check(rc, db);
int last_id = -1;
memset(sql, 0, sizeof(sql));
snprintf(sql, sizeof(sql)-1, "SELECT MAX(id) FROM tags;");
rc = sqlite3_exec(db, sql, ftag_tag_last_id, &last_id, NULL);
sqlite3_check(rc, db);
const char *new_tag_desc = argv[1];
assert(strlen(new_tag_desc) <= 600);
assert(strchr(new_tag_desc, '\'') == NULL);
last_id++;
memset(sql, 0, sizeof(sql));
snprintf(sql, sizeof(sql)-1,
"INSERT INTO tags VALUES(%d, '%s', '%s');",
last_id, new_tag_name, new_tag_desc);
rc = sqlite3_exec(db, sql, NULL, NULL, NULL);
sqlite3_check(rc, db);
}
static int ftag_tag_print(void *, int, char **cols, char **)
{
assert(cols[0]);
printf("%s\n", cols[0]);
return 0;
}
static void ftag_tag_list(int argc, char **argv)
{
const char *sql = "SELECT name FROM tags;";
sqlite3 *db = NULL;
int rc;
rc = sqlite3_open(DATABASE_PATH, &db);
sqlite3_check(rc, db);
rc = sqlite3_exec(db, sql, ftag_tag_print, NULL, NULL);
sqlite3_check(rc, db);
}
static void ftag_tag(int argc, char **argv)
{
assert_db_exists();
const struct ftag_command tag_commands[] = {
{.name = "add", .func = ftag_tag_add},
{.name = "list", .func = ftag_tag_list}
};
int tag_command_count = sizeof(tag_commands) / sizeof(struct ftag_command);
parse_args(argc, argv, tag_commands, tag_command_count);
}
static void parse_args(int argc,
char **argv,
const struct ftag_command *commands,
int command_count)
{
assert(argc > 0);
assert(command_count > 0);
for (int i = 0; i < command_count; i++) {
if (strcmp(argv[0], commands[i].name) == 0) {
commands[i].func(argc-1, argv+1);
return;
}
}
}
int main(int argc, char *argv[])
{
if (argc == 1) {
ftag_help(0, NULL);
exit(EXIT_FAILURE);
}
parse_args(argc-1, argv+1, toplevel_commands, toplevel_command_count);
return EXIT_SUCCESS;
}
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