10. ls

List all pages.

{"ls", 2, p_ls, NULL},

static int p_ls(int argc, char *argv[]);

You'll notice some duplicate code here. This has been introduced because of a change in behavior. The last parameter of "ls" can now specify the databse file name in place of "a.db". Because there are a variable number of arguments, there are a few permutations:

No arguments will invoke the default ls behavior with "a.db".

If there is one argument, it will either be "links", or a database name. "links" will list all the linked pages using "a.db". Any other value will invoke the default ls behavior using that as the database file name.

Three arguments will invoke "ls links" with a custom database filename. If the second argument is not "links", it will return an error.

The duplicate code is done for the sake of readability, and is used to make the edge cases above more clear-cut.

static int list(void *ud, int sz, char **argv, char **col)
{
    int n;
    for(n = 0; n < sz; n++) {
        if (n != 0) printf(" ");
        printf("%s", argv[n]);
    }
    printf("\n");
    return 0;
}

static int p_ls(int argc, char *argv[])
{
    weewiki_d ww;
    int rc;

    weewiki_init(&ww);

    rc = 0;

    if (argc == 1) {
        weewiki_open(&ww, weewiki_dbname_get());
        sqlite3_exec(ww.db,
                    "SELECT key FROM wiki;",
                    list,
                    NULL,
                    NULL);
    } else if (argc == 2) {
        if (!strcmp(argv[1], "links")) {
            weewiki_open(&ww, weewiki_dbname_get());
            sqlite3_exec(ww.db,
                        "SELECT key, filename FROM wikilinks;",
                        list,
                        NULL,
                        NULL);
        } else {
            weewiki_open(&ww, argv[1]);
            sqlite3_exec(ww.db,
                        "SELECT key FROM wiki;",
                        list,
                        NULL,
                        NULL);
        }
    } else if (argc == 3) {
        if (!strcmp(argv[1], "links")) {
            weewiki_open(&ww, argv[2]);
            sqlite3_exec(ww.db,
                        "SELECT key, filename FROM wikilinks;",
                        list,
                        NULL,
                        NULL);
        } else {
            fprintf(stderr, "Invalid command '%s'\n",
                    argv[1]);
            fprintf(stderr, "Expected 'links'.\n");
            rc = 1;
        }
    }

    weewiki_close(&ww);
    weewiki_clean(&ww);
    return rc;
}

---

prev | home | next