/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/


/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

/*
 * Copyright (c) 1983, 1984 1985, 1986, 1987, 1988, Sun Microsystems, Inc.
 * All Rights Reserved.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI" 


#include <locale.h>
#include <stdio.h>
#include <ctype.h>
#include <signal.h>
#define MAXENT 50

struct skeleton {
	char prompt[20];	/* prompt user for entry */
	char keylet[5]; 	/* key letter for database */
} bibskel[MAXENT] = {
	"   Author:",	"%A",
	"    Title:",	"%T",
	"  Journal:",	"%J",
	"   Volume:", 	"%V",
	"    Pages:",	"%P",
	"Publisher:",	"%I",
	"     City:", 	"%C",
	"     Date:", 	"%D",
	"    Other:",	"%O",
	" Keywords:",	"%K",	};

int entries = 10;	/* total number of entries in bibskel */
int abstract = 1;	/* asking for abstracts is the default */

usage()			/* print proper usage and exit */
{
	puts(gettext("Usage:  addbib [-p promptfile] [-a] database\n\
\t-p: the promptfile defines alternate fields\n\
\t-a: don't include prompting for the abstract\n"));
	exit(1);
}

main(argc, argv)	/* addbib: bibliography entry program */
int argc;
char *argv[];
{
	FILE *fp, *fopen();
	int i;

	(void) setlocale(LC_ALL, "");

#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
	(void) textdomain(TEXT_DOMAIN);

	if (argc == 1)
	{
		puts(gettext("You must specify a bibliography file (database)."));
		usage();
	}
	for (i = 1; argv[i][0] == '-'; i++)
	{
		if (argv[i][1] == 'p')
		{
			if (i >= argc - 2)
			{
				puts(gettext("Not enough arguments for -p option."));
				usage();
			}
			rd_skel(argv[++i]);
		}
		else if (argv[i][1] == 'a')
		{
			if (i >= argc - 1)
			{
				puts(gettext("No bibliofile specified after -a."));
				usage();
			}
			abstract = 0;
		}
		else  /* neither -p nor -a */
		{
			printf(gettext("Invalid command line flag: %s\n"), argv[i]);
			usage();
		}
	}
	if (i < argc - 1)
	{
		puts(gettext("Too many arguments with no options."));
		usage();
	}
	if ((fp = fopen(argv[i], "a")) == NULL)
	{
		perror(argv[i]);
		exit(1);
	}
	addbib(fp, argv[i]);	/* loop for input */
	exit(0);
	/* NOTREACHED */
}

addbib(fp, argv)	/* add entries to a bibliographic database */
FILE *fp;
char *argv;
{
	char line[BUFSIZ];
	int i = 0, firstln, repeat = 0, escape = 0;

	printf(gettext("Instructions? "));
	fgets(line, BUFSIZ, stdin);
	if (line[0] == 'y' || line[0] == 'Y')
		instruct();
	while (1)
	{
		putchar('\n');
		putc('\n', fp);
		for (i = 0; i < entries; i++)
		{
			printf("%s\t", gettext(bibskel[i].prompt));
			if (fgets(line, BUFSIZ, stdin) == NULL)
			{
				clearerr(stdin);
				break;
			}
			if (line[0] == '-' && line[1] == '\n')
			{
				i -= 2;
				if (i < -1)
				{
					printf(gettext("Too far back.\n"));
					i++;
				}
				continue;
			}
			else if (line[strlen(line)-2] == '\\')
			{
				if (line[0] != '\\')
				{
					line[strlen(line)-2] = '\n';
					line[strlen(line)-1] = NULL;
					trim(line);
					fprintf(fp, "%s %s",
						bibskel[i].keylet, line);
				}
				printf("> ");
				again:
				fgets(line, BUFSIZ, stdin);
				if (line[strlen(line)-2] == '\\')
				{
					line[strlen(line)-2] = '\n';
					line[strlen(line)-1] = NULL;
					trim(line);
					fputs(line, fp);
					printf("> ");
					goto again;
				}
				trim(line);
				fputs(line, fp);
			}
			else if (line[0] != '\n')
			{
				trim(line);
				fprintf(fp, "%s %s", bibskel[i].keylet, line);
			}
		}
		if (abstract)
		{
			puts(gettext(" Abstract: (ctrl-d to end)"));
			firstln = 1;
			while (fgets(line, BUFSIZ, stdin))
			{
				if (firstln && line[0] != '%')
				{
					fprintf(fp, "%%X ");
					firstln = 0;
				}
				fputs(line, fp);
			}
			clearerr(stdin);
		}
		fflush(fp);	/* write to file at end of each cycle */
		if (ferror(fp))
		{
			perror(argv);
			exit(1);
		}
		editloop:
		printf(gettext("\nContinue? "));
			fgets(line, BUFSIZ, stdin);
		if (line[0] == 'e' || line[0] == 'v')
		{
			bibedit(fp, line, argv);
			goto editloop;
		}
		if (line[0] == 'q' || line[0] == 'n')
			return;
	}
}

trim(line)		/* trim line of trailing white space */
char line[];
{
	int n;

	n = strlen(line);
	while (--n >= 0)
	{
		if (!isspace(line[n]))
			break;
	}
	line[++n] = '\n';
	line[++n] = NULL;
}

bibedit(fp, cmd, arg)	/* edit database with edit, ex, or vi */
FILE *fp;
char *cmd, *arg;
{
	int i = 0, status;

	fclose(fp);
	while (!isspace(cmd[i]))
		i++;
	cmd[i] = NULL;
	if (fork() == 0)
	{
		if (cmd[0] == 'v' && cmd[1] == 'i')
			execlp(cmd, cmd, "+$", arg, NULL);
		else /* either ed, ex, or edit */
			execlp(cmd, cmd, arg, NULL);
	}
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	wait(&status);
	signal(SIGINT, SIG_DFL);
	signal(SIGQUIT, SIG_DFL);
	if ((fp = fopen(arg, "a")) == NULL)
	{
		perror(arg);
		exit(1);
	}
}

instruct()		/* give user elementary directions */
{
	putchar('\n');
	puts(gettext("Addbib will prompt you for various bibliographic fields.\n"
"If you don't need a particular field, just hit RETURN,\n"
"\tand that field will not appear in the output file.\n"
"If you want to return to previous fields in the skeleton,\n"
"\ta single minus sign will go back a field at a time.\n"
"\t(This is the best way to input multiple authors.)\n"
"If you have to continue a field or add an unusual field,\n"
"\ta trailing backslash will allow a temporary escape.\n"
"Finally, (without -a) you will be prompted for an abstract\n"
"Type in as many lines as you need, and end with a ctrl-d.\n"
"To quit, type `q' or `n' when asked if you want to continue.\n"
"To edit the database, type `edit', `vi', or `ex' instead."));

}

rd_skel(arg)		/* redo bibskel from user-supplied file */
char *arg;
{
	FILE *pfp, *fopen();
	char str[BUFSIZ];
	int entry, i, j;

	if ((pfp = fopen(arg, "r")) == NULL)
	{
		fprintf(stderr, gettext("Promptfile "));
		perror(arg);
		exit(1);
	}
	for (entry = 0; fgets(str, BUFSIZ, pfp); entry++)
	{
		for (i = 0; str[i] != '\t' && str[i] != '\n'; i++)
			bibskel[entry].prompt[i] = str[i];
		bibskel[entry].prompt[i] = NULL;
		if (str[i] == '\n')
		{
			fprintf(stderr, gettext("No tabs between promptfile fields.\n"));
			fprintf(stderr, gettext("Format: prompt-string <TAB> %%key\n"));
			exit(1);
		}
		for (i++, j = 0; str[i] != '\n'; i++, j++) 
			bibskel[entry].keylet[j] = str[i];
		bibskel[entry].keylet[j] = NULL;

		if (entry >= MAXENT)
		{
			fprintf(stderr, gettext("Too many entries in promptfile.\n"));
			exit(1);
		}
	}
	entries = entry;
	fclose(pfp);
}