/*      $NetBSD: main.c,v 1.26 2023/08/26 14:59:44 rillig Exp $ */

/*
 * Copyright (c) 1980, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c      8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: main.c,v 1.26 2023/08/26 14:59:44 rillig Exp $");
#endif /* not lint */

#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include "error.h"
#include "pathnames.h"

FILE *errorfile;     /* where error file comes from */
FILE *queryfile;     /* input for the query responses from the user */

int nignored;
char **names_ignored;

size_t filelevel = 0;
int nerrors = 0;
Eptr er_head;
static Eptr *errors;

int nfiles = 0;
Eptr **files;           /* array of pointers into errors*/
bool *touchedfiles;     /* which files we touched */
int language = INCC;

char default_currentfilename[] = "????";
char *currentfilename = default_currentfilename;

bool query = false;     /* query the operator if touch files */
bool terse = false;     /* Terse output */

static char im_on[] = _PATH_TTY;        /* my tty name */
static bool notouch = false;            /* don't touch ANY files */

const char *suffixlist = ".*";  /* initially, can touch any file */

static int errorsort(const void *, const void *);
static void forkvi(int, char **);
static void try(const char *, int, char **);
static void usage(void) __attribute__((__noreturn__));

int
main(int argc, char **argv)
{
        int c;
        char *ignorename = NULL;
        int ed_argc;
        char **ed_argv;         /* return from touchfiles */
        bool show_errors = false;
        bool Show_Errors = false;
        bool pr_summary = false;
        bool edit_files = false;

        setprogname(argv[0]);

        errorfile = stdin;
        while ((c = getopt(argc, argv, "I:np:qSsTt:v")) != -1)
                switch (c) {
                case 'I':       /*ignore file name*/
                        ignorename = optarg;
                        break;
                case 'n':
                        notouch = true;
                        break;
                case 'p':
                        filelevel = (size_t)strtol(optarg, NULL, 0);
                        break;
                case 'q':
                        query = true;
                        break;
                case 'S':
                        Show_Errors = true;
                        break;
                case 's':
                        pr_summary = true;
                        break;
                case 'T':
                        terse = true;
                        break;
                case 't':
                        suffixlist = optarg;
                        break;
                case 'v':
                        edit_files = true;
                        break;
                default:
                        usage();
                }

        argv += optind;
        argc -= optind;

        switch (argc) {
        case 0:
                break;
        case 1:
                if ((errorfile = fopen(argv[0], "r")) == NULL)
                        err(1, "Cannot open `%s' to read errors", argv[0]);
                break;
        default:
                usage();
        }

        if (notouch)
                suffixlist = NULL;


        if ((queryfile = fopen(im_on, "r")) == NULL) {
                if (query)
                        err(1, "Cannot open `%s' to query the user", im_on);
        }
        if (signal(SIGINT, onintr) == SIG_IGN)
                signal(SIGINT, SIG_IGN);
        if (signal(SIGTERM, onintr) == SIG_IGN)
                signal(SIGTERM, SIG_IGN);
        getignored(ignorename);
        eaterrors(&nerrors, &errors);
        if (Show_Errors)
                printerrors(true, nerrors, errors);
        qsort(errors, nerrors, sizeof(Eptr), errorsort);
        if (show_errors)
                printerrors(false, nerrors, errors);
        findfiles(nerrors, errors, &nfiles, &files);
#define P(msg, arg) fprintf(stdout, msg, arg)
        if (pr_summary) {
                if (nunknown > 0)
                        P("%d Errors are unclassifiable.\n", nunknown);
                if (nignore > 0)
                        P("%d Errors are classifiable, but totally "
                            "discarded.\n", nignore);
                if (nsyncerrors > 0)
                        P("%d Errors are synchronization errors.\n",
                            nsyncerrors);
                if (nignore > 0)
                        P("%d Errors are discarded because they refer to "
                            "sacrosinct files.\n", ndiscard);
                if (nnulled > 0)
                        P("%d Errors are nulled because they refer to specific "
                            "functions.\n", nnulled);
                if (nnonspec > 0)
                        P("%d Errors are not specific to any file.\n",
                            nnonspec);
                if (nthisfile > 0)
                        P("%d Errors are specific to a given file, but not "
                            "to a line.\n", nthisfile);
                if (ntrue > 0)
                        P("%d Errors are true errors, and can be inserted "
                            "into the files.\n", ntrue);
        }
        filenames(nfiles, files);
        fflush(stdout);
        if (touchfiles(nfiles, files, &ed_argc, &ed_argv) && edit_files)
                forkvi(ed_argc, ed_argv);
        return 0;
}

static void
forkvi(int argc, char **argv)
{
        if (query) {
                switch (inquire(terse
                    ? "Edit? "
                    : "Do you still want to edit the files you touched? ")) {
                case Q_error:
                case Q_NO:
                case Q_no:
                        return;
                default:
                        break;
                }
        }
        /*
         *      ed_argument's first argument is
         *      a vi/ex compatible search argument
         *      to find the first occurrence of ###
         */
        try("vi", argc, argv);
        try("ex", argc, argv);
        try("ed", argc-1, argv+1);
        fprintf(stdout, "Can't find any editors.\n");
}

static void
try(const char *name, int argc, char **argv)
{
        argv[0] = __UNCONST(name);
        wordvprint(stdout, argc, argv);
        fprintf(stdout, "\n");
        fflush(stderr);
        fflush(stdout);
        sleep(2);
        if (freopen(im_on, "r", stdin) == NULL)
                return;
        if (freopen(im_on, "w", stdout) == NULL)
                return;
        execvp(name, argv);
}

static int
errorsort(const void *x1, const void *x2)
{
        const Eptr *epp1 = x1;
        const Eptr *epp2 = x2;
        Eptr ep1, ep2;
        int order;

        /*
         * Sort by:
         *      1) synchronization, non specific, discarded errors first;
         *      2) nulled and true errors last
         *         a) grouped by similar file names
         *             1) grouped in ascending line number
         */
        ep1 = *epp1; ep2 = *epp2;
        if (ep1 == 0 || ep2 == 0)
                return 0;
        if (NOTSORTABLE(ep1->error_e_class) ^ NOTSORTABLE(ep2->error_e_class)) {
                return NOTSORTABLE(ep1->error_e_class) ? -1 : 1;
        }
        if (NOTSORTABLE(ep1->error_e_class))    /* then both are */
                return ep1->error_no - ep2->error_no;
        order = strcmp(ep1->error_text[0], ep2->error_text[0]);
        if (order == 0) {
                return ep1->error_line - ep2->error_line;
        }
        return order;
}

static void
usage(void)
{
        fprintf(stderr, "Usage: %s [-nqSsTv] [-I ignorefile] "
            "[-p filelevel] [-t suffixlist] [name]\n", getprogname());
        exit(1);
}