//
// aegis - project change supervisor
// Copyright (C) 1991-1995, 1999, 2001-2008, 2012 Peter Miller
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//

#include <common/ac/stdio.h>
#include <common/ac/string.h>

#include <common/progname.h>
#include <common/quit.h>
#include <common/sizeof.h>
#include <common/trace.h>
#include <common/version_stmp.h>
#include <libaegis/arglex2.h>
#include <libaegis/help.h>
#include <libaegis/output/pager.h>
#include <libaegis/output/wrap.h>
#include <libaegis/sub.h>
#include <libaegis/version.h>


void
version_copyright()
{
    static const char *const text[] =
    {
        "\n",
        "The %s program comes with ABSOLUTELY NO WARRANTY; ",
        "for details use the '%s -VERSion License' command.  ",
        "The %s program is free software, and you are welcome ",
        "to redistribute it under certain conditions; for ",
        "details use the '%s -VERSion License' command.\n",
    };

    const char *progname = progname_get();
    output::pointer fp = output_pager::open();
    fp = output_wrap_open(fp, -1);
    fp->fprintf("%s version %s\n", progname, version_stamp());
    fp->fprintf("Copyright (C) %s Peter Miller\n", copyright_years());
    for (const char *const *cpp = text; cpp < ENDOF(text); ++cpp)
    {
        const char *line = *cpp;
        for (;;)
        {
            const char *p = strstr(line, "%s");
            if (!p)
                break;
            fp->write(line, p - line);
            line = p + 2;
            fp->fputs(progname);
        }
        fp->fputs(line);
    }
}


static void
version_license(void)
{
    help("aelic", (void (*)(void))0);
}


static void
version_usage(void)
{
    const char      *progname;

    progname = progname_get();
    fprintf(stderr, "usage: %s -VERSion [ <info-name> ]\n", progname);
    fprintf(stderr, "       %s -VERSion -Help\n", progname);
    quit(1);
}


struct table_ty
{
    const char      *name;
    void            (*func)(void);
};


static table_ty table[] =
{
    { "Copyright",      version_copyright,      },
    { "License",        version_license,        },
};


static void
version_main(void)
{
    sub_context_ty  *scp;
    void            (*func)(void);
    const char      *name;

    trace(("version_main()\n{\n"));
    arglex();
    name = 0;
    while (arglex_token != arglex_token_eoln)
    {
        switch (arglex_token)
        {
        default:
            generic_argument(version_usage);
            continue;

        case arglex_token_string:
            if (name)
            {
                scp = sub_context_new();
                fatal_intl(scp, i18n("too many info names"));
            }
            name = arglex_value.alv_string;
            break;
        }
        arglex();
    }

    if (name)
    {
        int             nhit;
        table_ty        *tp;
        string_ty       *s1;
        string_ty       *s2;
        table_ty        *hit[SIZEOF(table)];
        int             j;

        nhit = 0;
        for (tp = table; tp < ENDOF(table); ++tp)
        {
            if (arglex_compare(tp->name, name, 0))
                hit[nhit++] = tp;
        }
        switch (nhit)
        {
        case 0:
            scp = sub_context_new();
            sub_var_set_charstar(scp, "Name", name);
            fatal_intl(scp, i18n("no info $name"));
            // NOTWEACHED

        case 1:
            break;

        default:
            s1 = str_from_c(hit[0]->name);
            for (j = 1; j < nhit; ++j)
            {
                s2 = str_format("%s, %s", s1->str_text, hit[j]->name);
                str_free(s1);
                s1 = s2;
            }
            scp = sub_context_new();
            sub_var_set_charstar(scp, "Name", name);
            sub_var_set_string(scp, "Name_List", s1);
            fatal_intl(scp, i18n("info $name ambig ($name_list)"));
            // NOTREACHED
        }
        arglex();
        func = hit[0]->func;
    }
    else
        func = version_copyright;

    func();
    trace(("}\n"));
}


static void
version_help(void)
{
    help("aev", version_usage);
}


void
version(void)
{
    static arglex_dispatch_ty dispatch[] =
    {
        { arglex_token_help, version_help, 0 },
    };

    trace(("version()\n{\n"));
    arglex_dispatch(dispatch, SIZEOF(dispatch), version_main);
    trace(("}\n"));
}


// vim: set ts=8 sw=4 et :