/*
 *  REFS.C
 *
 *  Bringup a cross reference editor window.  The file S:dme.refs and
 *  dme.refs in the current directory are searched for the reference.
 *  If found, the file specified is searched and the segment specified
 *  loaded as a new file in a new window.
 */

#include "defs.h"
#include <stdio.h>

#define PEN    struct _PEN

PEN {
    MNODE   Node;
    char    *path;
};

extern char *breakout();

MLIST	PBase;		/*  special DME paths	*/

/*
 *  Special DME paths for REF and CTAGS
 */

#ifndef NO_DO2

void
do_addpath()
{
    register PEN *pen;
    register short len = strlen(av[1]);

    for (pen = (PEN *)PBase.mlh_Head; pen->Node.mln_Succ; pen = (PEN *)pen->Node.mln_Succ) {
	if (strcmp(av[1], pen->path) == 0)
	    return;
    }
    if (pen = malloc(sizeof(PEN)+len+2)) {
	pen->path = (char *)(pen + 1);
	strcpy(pen->path, av[1]);
	switch(pen->path[len-1]) {
	case ':':
	case '/':
	    break;
	default:
	    strcat(pen->path, "/");
	}
    }
    AddTail((LIST *)&PBase, (NODE *)pen);
}

void
do_rempath()
{
    register PEN *pen, *npen;

    for (pen = (PEN *)PBase.mlh_Head; npen = (PEN *)pen->Node.mln_Succ; pen = npen) {
	if (WildCmp(av[1], pen->path)) {
	    Remove((NODE *)pen);
	    free(pen);
	}
    }
}

#endif

#ifndef NO_DO_CTAGS

/*
 *  Implement ctags
 */

void
do_ctags()
{
    char str[64];
    char path[128];
    char buf[128];
    char sbuf[128];
    short xlen;
    short slen;
    short dbaselen;
    long oldlock = CurrentDir(Ep->dirlock);
    ED *ed;

    {
	register short i, j;

	for (i = Ep->Column; Current[i] == ' '; ++i);
	for (j = i; ; ++j) {
	    register short c = Current[j];
	    if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c == '_') || (c >= '0' && c <= '9'))
		continue;
	    break;
	}
	j -= i;
	if (j > 63)
	    j = 63;
	BMov(Current+i, str, j);
	str[j] = 0;
	xlen = j;
    }
    if (!Ep->iconmode)
	title("search tags");
    {
	void *xfi;
	PEN *pen, *npen;
	register long i;
	register short j, len;

	dbaselen = dirpart(Ep->Name);
	BMov(Ep->Name, path, dbaselen);
	strcpy(path+dbaselen, "tags");

	/*
	 *  Note: pen not used first pass and set to list head, so next
	 *  pass it will be the first element.
	 *
	 *  Note2:  The file path depends on several factors.  (1) tags in
	 *	    'current' directory, use path to name of current window.
	 *	    (2) tags in directory in DME special path, use special
	 *	    path.  (3) tag entry is a full path name, override
	 *	    previous directories.
	 */

	for (pen = (PEN *)&PBase; npen = (PEN *)pen->Node.mln_Succ; pen = npen) {
	    mountrequest(0);
	    if (xfi = xfopen(path, "r", 4096)) {
		mountrequest(1);
		while ((len = xefgets(xfi, buf, 128)) >= 0) {
		    for (j = 0; buf[j] && buf[j] != ' '; ++j);
		    if (j == 0 || buf[0] == '#')
			continue;
		    if (j == xlen && strncmp(str, buf, j) == 0) {
			while (buf[j] == ' ')
			    ++j;
			/*
			 *  Extract the file name into str.  If the
			 *  filename does not contain an absolute path,
			 *  prepend it with such.
			 */
			{
			    char prep = 1;
			    for (i = 0; buf[j] && buf[j] != ' '; ++i, ++j) {
				str[i] = buf[j];
				if (str[i] == ':')
				    prep = 0;
			    }
			    if (prep) {
				BMov(str, str + dbaselen, i);
				BMov(path, str, dbaselen);
				i += dbaselen;
			    }
			}
			str[i] = 0;

			while (buf[j] && buf[j] != '^')     /*  SEARCH ARG */
			    ++j;
			xfclose(xfi);
			if (buf[j] != '^') {
			    title("tags error");
			    goto done;
			}
			++j;
			strcpy(sbuf, buf+j);
			slen = strlen(sbuf);
			if ((ed = finded(str, 0)) == NULL) {
			    strcpy(buf, "newwindow newfile ");
			    strcat(buf, str);
			    do_command(buf);
			    ed = finded(str, 0);
			} else {
			    WindowToFront(ed->Win);
			    ActivateWindow(ed->Win);
			}
			if (ed == NULL) {
			    title("unable to load file");
			    goto done;
			}
			text_switch(ed->Win);
			if (Ep->iconmode)
			    uniconify();
			else
			    text_cursor(0);
			for (i = 0; i < ed->Lines; ++i) {
			    if (strncmp(ed->List[i], sbuf, slen) == 0)
				break;
			}
			sprintf(buf, "first goto %ld", i+1);
			do_command(buf);
			goto done;
		    }
		}
		xfclose(xfi);
	    } else {
		mountrequest(1);
	    }
	    if (npen->Node.mln_Succ) {
		strcpy(path, npen->path);
		strcat(path, "tags");
		dbaselen = strlen(npen->path);
	    }
	}
	title("tag not found");
    }
done:
    CurrentDir(oldlock);
}

#endif

#ifndef NO_DO_REFS

/*
 *  Implement references
 */

void
do_refs()
{
    char str[256];
    char path[128];
    char *srch;
    char *file;
    char *estr;
    long len;
    int bcnt = 10;
    register short i, j;
    short slen, elen;
    void *xfi, *xfj;
    short tmph, tmpw;
    long oldlock = CurrentDir(Ep->dirlock);

    for (i = Ep->Column; Current[i] == ' '; ++i);     /*  skip spaces     */
    for (j = i       ; ; ++j) {
	if (Current[j] && Current[j] != ' ')
	    continue;
	break;
    }
    j -= i;
    if (j > 63)
	j = 63;
    BMov(Current+i, str, j);
    str[j] = 0;
    title("search .refs");
    {
	register PEN *pen;
	register PEN *npen;

	strcpy(path, "dme.refs");
	mountrequest(0);
	for (pen = (PEN *)&PBase; npen = (PEN *)pen->Node.mln_Succ; pen = npen) {
	    if (searchref(path, str, &srch, &file, &len, &estr)) {
		mountrequest(1);
		goto found;
	    }
	    if (npen->Node.mln_Succ) {
		strcpy(path, npen->path);
		strcat(path, "dme.refs");
	    }
	}
	title("Reference not found");
	mountrequest(1);
	goto done;
    }
found:
    title("search file");
    slen = strlen(srch);
    if (estr)
	elen = strlen(estr);
    if (xfi = xfopen(file, "r", 4096)) {
	short lenstr;
	if (srch[0] == '@' && srch[1] == '@') {
	    xfseek(xfi, atoi(srch+2));
	    if ((lenstr = xefgets(xfi, str, 256)) >= 0)
		goto autoseek;
	}
	while ((lenstr = xefgets(xfi, str, 256)) >= 0) {
	    if (strncmp(str, srch, slen) == 0) {
autoseek:
		title("load..");
		if (xfj = xfopen("t:dme_ref", "w", 1024)) {
		    tmph = 0;
		    tmpw = 0;
		    do {
			if (lenstr > tmpw)
			    tmpw = strlen(str);
			++tmph;
			xfwrite(xfj, str, strlen(str));
			xfwrite(xfj, "\n", 1);
			if (estr && strncmp(str,estr,elen) == 0)
			    break;
			--len;
		    } while ((lenstr=xefgets(xfi, str, 256)) >= 0 && len);
		    xfclose(xfj);
		    if (tmph > 10)
			tmph = 10;
		    if (tmpw > 80)
			tmpw = 80;
		    sprintf(str, "tmpheight %ld tmpwidth %ld newwindow newfile t:dme_ref", (tmph<<3)+24, (tmpw<<3)+24);
		    do_command(str);
		    unlink("t:dme_ref");
		} else {
		    title("Unable to open t:dme_ref for write");
		}
		xfclose(xfi);
		free(srch);
		free(file);
		if (estr)
		    free(estr);
		goto done;
	    }
	    if (--bcnt == 0) {      /* check break every so so  */
		bcnt = 50;
		if (breakcheck())
		    break;
	    }
	}
	xfclose(xfi);
	title("Search failed");
    } else {
	title("Unable to open sub document");
    }
    free(srch);
    free(file);
    if (estr)
	free(estr);
done:
    CurrentDir(oldlock);
}

/*
 *  Reference file format:
 *
 *  `key' `lines' `file' `searchstring'
 *
 *  where `lines' can be a string instead ... like a read-until, otherwise
 *  the number of lines to read from the reference.
 */

searchref(file, find, psstr, pfile, plines, pestr)
char *file, *find;
char **psstr, **pfile, **pestr;
long *plines;
{
    void *xfi;
    char buf[256];
    char *ptr, *base;
    char *b1, *b2, *b3, *b4;
    char quoted;

    if (xfi = xfopen(file, "r", 4096)) {
	while (xefgets(xfi,(base=buf), 256) >= 0) {
	    if (buf[0]=='#')
		continue;
	    ptr = breakout(&base, &quoted, &b1);
	    if (ptr && *ptr && strncmp(ptr, find, strlen(ptr)) == 0) {
		if (ptr = breakout(&base, &quoted, &b2)) {
		    *pestr = NULL;
		    *plines = atoi(ptr);
		    if (*plines == 0) {
			*pestr = (char *)malloc(strlen(ptr)+1);
			strcpy(*pestr, ptr);
		    }
		    if (ptr = breakout(&base, &quoted, &b3)) {
			*pfile = (char *)malloc(strlen(ptr)+1);
			strcpy(*pfile, ptr);
			if (ptr = breakout(&base, &quoted, &b4)) {
			    *psstr = (char *)malloc(strlen(ptr)+1);
			    strcpy(*psstr, ptr);
			    xfclose(xfi);
			    if (b1) free(b1);
			    if (b2) free(b2);
			    if (b3) free(b3);
			    if (b4) free(b4);
			    return(1);
			}
			free(*pfile);
			if (b4)
			    free(b4);
		    }
		    if (pestr)
			free (*pestr);
		    if (b3)
			free (b3);
		}
		if (b2)
		    free(b2);
	    }
	    if (b1)
		free(b1);
	}
	xfclose(xfi);
    }
    return(0);
}

#endif

#ifndef NO_DO_CTAGS

dirpart(str)
register char *str;
{
    register short i;

    for (i = strlen(str) - 1; i >= 0; --i) {
	if (str[i] == '/' || str[i] == ':')
	    break;
    }
    return(i+1);
}

#endif