/********************************************************************
* $Author: jgoerzen $
* $Revision: 1.5 $
* $Date: 2002/03/19 20:22:42 $
* $Source: /home/jgoerzen/tmp/gopher-umn/gopher/head/gopher/pager.c,v $
* $State: Exp $
*
* Paul Lindner, University of Minnesota CIS.
*
* Copyright 1991, 92, 93, 94 by the Regents of the University of Minnesota
* see the file "Copyright" in the distribution for conditions of use.
*********************************************************************
* MODULE: pager.c
* neato pager..
*********************************************************************
* Revision History:
* $Log: pager.c,v $
* Revision 1.5  2002/03/19 20:22:42  jgoerzen
* Logged regex changes.
* Include STRstring.h and strcasestr proto.
*
* Revision 1.4  2002/02/12 21:20:14  jgoerzen
* Made files using strcasecmp() include util.h
*
* Revision 1.3  2001/01/17 21:48:05  jgoerzen
* Many fixes and tune-ups.  Now compiles cleanly with -Wall -Werror!
*
* Revision 1.2  2001/01/03 22:31:38  s2mdalle
* Inclusion of new header file
*
* Revision 1.1.1.1  2000/08/19 00:28:56  jgoerzen
* Import from UMN Gopher 2.3.1 after GPLization
*
* Revision 3.34  1995/11/03  21:18:22  lindner
* ANSIfication
*
* Revision 3.33  1995/05/01  05:41:30  lindner
* compatibility fixes
*
* Revision 3.32  1995/05/01  03:41:49  lindner
* Fix return value
*
* Revision 3.31  1995/04/15  07:08:03  lindner
* Fix
*
* Revision 3.30  1995/02/23  21:53:53  lindner
* Correct cast..
*
* Revision 3.29  1995/01/03  19:53:25  lindner
* Dynamic screen position code, long title fix from Allan L. Bazinet
*
* Revision 3.28  1994/12/03  01:52:19  lindner
* Don't auto exit paging at the end of the file
*
* Revision 3.27  1994/10/21  04:41:08  lindner
* Add ANSI attached printer code..
*
* Revision 3.26  1994/06/29  07:14:39  lindner
* Check for A_CHARTEXT before trying to use it
*
* Revision 3.25  1994/06/29  05:13:55  lindner
* Change to Stat.h
*
* Revision 3.24  1994/06/09  22:13:40  lindner
* More language conversions
*
* Revision 3.23  1994/06/09  16:35:57  lindner
* Fix typos
*
* Revision 3.22  1994/06/09  04:37:06  lindner
* (F.Macrides) Fixed PagerNextPage() and PagerSearch() to not add extra
* blank lines following lines that are exactly equal to the screen width
* on VMS.  Added code to disallow 'm'ail if SecureMode or NoShellMode
* and the NOMAIL symbol was defined on compilation.
*
* Revision 3.21  1994/06/03  06:12:19  lindner
* Fix for redisplay after using help
*
* Revision 3.20  1994/05/19  14:08:05  lindner
* use fast malloc on VMS VAXC
*
* Revision 3.19  1994/05/18  03:59:41  lindner
* Change to FIOsystem() for VMS
*
* Revision 3.18  1994/05/17  05:48:06  lindner
* Massive internationalization change
*
* Revision 3.17  1994/05/14  04:13:47  lindner
* Internationalization...
*
*
*********************************************************************/

/** Note, uses Global "Searchstring" **/

#include "gopher.h"
#include "CURcurses.h"
#include "STRstring.h"
#include "fileio.h"
#include "Malloc.h"
#include "pager.h"
#include "util.h"

#ifdef VMS
#include <stat.h>
#else
#include <sys/stat.h>
#endif


#define PosIncrement 10      /* room for 10 screens per malloc */

/** Argv/argc for searched words.. **/
static char *words[50];
static int  wordcount = 0;

/** Optional search string **/
static char slashstring[128];

/** bytecount positions for each page..  (non-dynamic.. yet...) **/
/* static int  positions[4000]; */  /** Bad programmer **/
static int *positions = NULL;  /* not-so-bad programmer */
static int  currentpage;
static int  pos_max;

/*
* This is the beginning of a built in pager..
* it is very pretty..
*
*/

void
PagerHelp(CursesObj *cur)
{
    static char **helpmenu = NULL;

    if (helpmenu == NULL) {
         helpmenu = (char**) malloc(sizeof(char*) * 9);
         helpmenu[0] = Gtxt("u, ^G, left : Return to menu",19);
         helpmenu[1] = Gtxt("space, down : Move to the next page",20);
         helpmenu[2] = Gtxt("b, up       : Move to the previous page",21);
         helpmenu[3] = Gtxt("/           : Search for text",22);
         helpmenu[4] = Gtxt("m           : mail current document",23);
         helpmenu[5] = Gtxt("s           : save current document",24);
         helpmenu[6] = Gtxt("p           : print current document",25);
         helpmenu[7] = Gtxt("D           : download current document",26);
         helpmenu[8] = NULL;
    }

    CURDialog(cur, Gtxt("Pager Help",18), helpmenu);
}

void
PagerInitGlobals(void)
{
    currentpage = 0;
    wordcount = 0;
    slashstring[0] = '\0';
}


void
PagerTitles(CursesObj *cur, GopherObj *gs, int totalbytes)
{
    int i, fluff_len, k_bytes;
    char *cp;

    k_bytes = totalbytes/1024;

    /* Okay, first draw the top... ***/

    move(0,0);
    wboldout(stdscr);

    fluff_len = 11 + (k_bytes/10);     /* 11 = strlen("_(0k)_100%_"); */
    if((strlen(GSgetTitle(gs))) <= (COLS-fluff_len)) {
      waddstr(stdscr, GSgetTitle(gs));
    } else {
      cp = GSgetTitle(gs);
      for(i = 0; i < (COLS-(fluff_len+3)); i++) {
        waddch(stdscr, *cp++);
      }
      waddstr(stdscr, "...");
    }
    wboldend(stdscr);

    wprintw(stdscr, " (%dk)", k_bytes);

    wmove(stdscr, 1,0);
    waddch(stdscr, CURgetBox_ul(cur));

    for (i=0; i<COLS-2; i++)
         waddch(stdscr, CURgetBox_hline(cur));

    waddch(stdscr, CURgetBox_ur(cur));


    /*  And now the bottom **/

    wmove(stdscr, LINES-2, 0);
    waddch(stdscr, CURgetBox_ll(cur));
    for (i=0; i<COLS-2; i++)
         waddch(stdscr, CURgetBox_hline(cur));
    waddch(stdscr, CURgetBox_lr(cur));

    /****/
    wmove(stdscr, LINES-1,0);
    CURbutton(cur, stdscr, Gtxt("PageDown: <SPACE>",115), FALSE);
    waddch(stdscr, ' ');
    CURbutton(cur, stdscr, Gtxt("Help: ?",96), FALSE);
    waddch(stdscr, ' ');
    CURbutton(cur, stdscr, Gtxt("Return to Menu: u",134), FALSE);
}

int PagePosAlloc(void)
{
 size_t MallocSize;

 MallocSize = sizeof(int) * PosIncrement;
 positions = (int *) malloc(MallocSize);
 if (!positions)
   return(FALSE);
 else {
   pos_max = PosIncrement;
   return(TRUE);
 }
}


int PagePosRealloc(void)
{
 int *temp = NULL;  /* in case realloc fails */
 size_t MallocSize;

 MallocSize = sizeof(int) * (pos_max + PosIncrement);
 temp = positions;
 positions = (int *) realloc(positions, MallocSize);
 if(!positions) {
   positions = temp;
   return(FALSE);
 } else {
   pos_max += PosIncrement;
   return(TRUE);
 }
}


void PagePosFree(void)
{
 if(positions) free(positions);
}


void
PagerPercent(int bytes, int totalbytes)
{
    int per = (totalbytes? ((100 * bytes)/totalbytes) : 0);

    wmove(stdscr, 0, COLS-5);
    if (totalbytes != 0)
         wprintw(stdscr, "%d%%", per);
    if (per < 100)
         waddch(stdscr, ' ');
    if (per < 10)
         waddch(stdscr, ' ');
}

/*
* Turn the search terms into a argv style thing..
*/

void
PagerParseSearchstring(void)
{
    char *MungeSearchstr = Searchstring;
    int  numchars;
    char theline[256];

    wordcount = 0;

    if (Searchstring == NULL)
         return;

    while (isspace(*MungeSearchstr)) /** Strip off spaces **/
         MungeSearchstr++;

    for (wordcount=0; wordcount<40; wordcount++) {

         while (isspace(*MungeSearchstr)) /** Strip off spaces **/
              MungeSearchstr++;

         numchars = sreadword(MungeSearchstr, theline, 40);
         MungeSearchstr += numchars;

         if (numchars == 0)
              break;

         if (strcasecmp(theline, "and")==0 ||
             strcasecmp(theline, "or")==0 ||
             strcasecmp(theline, "not")==0) {
              wordcount--;
         } else {
              if (words[wordcount] != NULL)
                   free(words[wordcount]);

              words[wordcount] = strdup(theline);
         }
    }
}



void
PagerPrintLine(char *inputline)
{
    int lowwordnum = -1, i;
    char *cp, *lowword;
    int wlen;

    /** Just print it if no search terms **/
    if ((wordcount  == 0 && slashstring[0] == '\0') ||
        RCsearchBolding(GlobalRC) == FALSE) {
         waddstr(stdscr, inputline);
         return;
    }

    /** Find the first word in the line **/

    while (*inputline!='\0') {
         lowword = NULL;

         if (slashstring[0] != '\0')
              cp = strcasestr(inputline, slashstring);
         else
              cp = NULL;

         if (cp != NULL) {
              lowword    = cp;
              lowwordnum = -1;
         }

         for (i=0; i< wordcount; i++) {
              cp = strcasestr(inputline, words[i]);
              if (cp != NULL)
                   if (cp < lowword || lowword == NULL) {
                        lowword = cp;
                        lowwordnum = i;
                   }
         }

         if (lowword == NULL) {
              /** No search terms, spit it out **/
              waddstr(stdscr, inputline);
              return;
         }
         else {
              /** add non bolded stuff **/
              for (cp = inputline; cp < lowword; cp++)
#if defined(GINTERNATIONAL) && defined(A_CHARTEXT)
                   waddch(stdscr, *cp & A_CHARTEXT);
#else
              waddch(stdscr, *cp);
#endif

              inputline = lowword;

              /*** Bolded stuff ***/
              standout();
              if (lowwordnum == -1)
                   wlen = strlen(slashstring);
              else
                   wlen = strlen(words[lowwordnum]);

              for (cp = inputline; cp < inputline + wlen; cp++)
                   waddch(stdscr, *cp);
              inputline += wlen;

              standend();
         }
    }
}


void
PagerSeekPage(FILE *thefile, int gotopage, int *bytecount)
{
    if (gotopage < currentpage) {
         fseek(thefile, positions[gotopage], 0);
         *bytecount = positions[gotopage];
         currentpage = gotopage;
    }
}


void
PagerNextPage(CursesObj *cur, FILE *thefile, char *theline, int *bytecount, int totalbytes)
{
    int i;
    char *cp = NULL;
#ifdef VMS
    boolean check_next_line = FALSE;
#endif

    /** Save current bytecount position **/
    positions[currentpage++] = *bytecount;
    if(currentpage == pos_max)
      if(!PagePosRealloc()) {
        CursesErrorMsg(Gtxt("Sorry, can't display this file",148));
        return;
      }

    wmove(stdscr, 2, 0);

    /* Display a screen of text */
    for (i=0; i<LINES-4; i++) {
         cp = fgets(theline, COLS+1, thefile);
         if (cp == NULL)
              break;
#if defined(VMS) && defined(VMSRecords)
         *bytecount = ftell(thefile);
         if (check_next_line == TRUE) {
             check_next_line = FALSE;
             if (strlen(cp) == 1 && cp[0] == '\n')
                 goto read_again;
         }
         if (strlen(cp) == COLS && cp[COLS-1] != '\n')
             check_next_line = TRUE;

#else
         *bytecount += strlen(theline);
#endif

         ZapCRLF(theline);
         /** Bold the terms... **/

         wmove(stdscr, i+2, 0);
         wclrtoeol(stdscr);
         PagerPrintLine(theline);
    }
    while (i<LINES-4) {
         wmove(stdscr, i+2, 0);
         wclrtoeol(stdscr);
         i++;
    }

    /*** Display buttons ***/
    wmove(stdscr, LINES - 1, 0);
    wclrtoeol(stdscr);
    CURbutton(cur, stdscr, Gtxt("Help: ?",96), FALSE);
    waddstr(stdscr, "  ");
    CURbutton(cur, stdscr, Gtxt("Exit: u",86), FALSE);
    waddstr(stdscr, "  ");
    if (*bytecount != totalbytes) {
         CURbutton(cur, stdscr, Gtxt("PageDown: Space",116), FALSE);
         waddstr(stdscr, "  ");
    }
    if (currentpage > 1)
         CURbutton(cur, stdscr, Gtxt("PageUp: b",117), FALSE);
}

/*
* Seek to the page with the specific search term...
*/

boolean
PagerSearch(FILE *thefile, char *theline, int *bytecount, char *search)
{
    int i;
    char *cp = NULL;
#ifdef VMS
    boolean check_next_line = FALSE;
#endif


    do {
         /** Save current bytecount position **/
         positions[currentpage++] = *bytecount;
         if(currentpage == pos_max)
           if(!PagePosRealloc()) {
             CursesErrorMsg(Gtxt("Sorry, can't display this file",148));
             return(FALSE);
           }
         for (i=0; i<LINES-4; i++) {
              cp = fgets(theline, COLS+1, thefile);
              if (cp == NULL)
                   break;

#if defined(VMS) && defined(VMSRecords)
              *bytecount = ftell(thefile);
              if (check_next_line == TRUE) {
                  check_next_line = FALSE;
                  if (strlen(cp) == 1 && cp[0] == '\n')
                      goto search_again;
              }
              if (strlen(cp) == COLS && cp[COLS-1] != '\n')
                  check_next_line = TRUE;
#else
              *bytecount += strlen(theline);
#endif

              if (strcasestr(cp, search) != NULL)
                   return(TRUE);
         }
    } while (cp != NULL);

    return(FALSE);
}

void
PagerBuiltin(CursesObj *cur, GopherObj *gs)
{
    int         ch;
    FILE        *thefile;
    char        *theline;
    char        *Dialogmess[3];
    char        command[MAXSTR];
    boolean     done = FALSE;
    int         bytecount = 0;
    int         totalbytes = 0;
    int         savedpagenum;
    struct stat buf;

    PagerInitGlobals();

    if(!PagePosAlloc()) {
      CursesErrorMsg(Gtxt("Sorry, can't display this file",148));
      return;
    }

    /*** Initialize an array for the screen ... ***/
    theline = (char *) malloc(sizeof(char)*(COLS+1));
    *theline = '\0';

    stat(GSgetLocalFile(gs), &buf);
    totalbytes = buf.st_size;

    PagerParseSearchstring();

    clear();
    PagerTitles(cur, gs, totalbytes);
    refresh();

    thefile = fopen(GSgetLocalFile(gs), "r");

    if (thefile == NULL) {
         CursesErrorMsg(Gtxt("Cannot open requested file..",71));
         if(theline) free(theline);
         return;
    }

    PagerNextPage(cur, thefile, theline, &bytecount, totalbytes);

    refresh();

    /* Get a keystroke */
    while (done==FALSE) {
         PagerPercent(bytecount, totalbytes);
         refresh();

         ch = CURgetch(cur);

         switch (ch) {
#ifdef VMS
         case '\032': /* ^Z */
#endif
         case KEY_LEFT:
         case 'u':
         case 'q':
         case '\007':
              done = TRUE;
              break;

         case '\006':
         case '\n':
         case ' ':
         case KEY_DOWN:
         case KEY_NPAGE:
              if (bytecount < totalbytes)
                   PagerNextPage(cur, thefile, theline, &bytecount,
                        totalbytes);
              break;

         case '\002':
         case KEY_UP:
         case KEY_PPAGE:
         case 'b':
              if (currentpage > 1) {
                   PagerSeekPage(thefile, currentpage-2, &bytecount);
                   PagerNextPage(cur, thefile, theline, &bytecount,
                        totalbytes);
              }
              break;

         case '^':
              if (currentpage > 1) {
                   PagerSeekPage(thefile, 0, &bytecount);
                   PagerNextPage(cur, thefile, theline, &bytecount,
                        totalbytes);
              }
              break;

         case '$':
              if (bytecount < totalbytes)
                   do
                        PagerNextPage(cur, thefile, theline, &bytecount,
                             totalbytes);
                   while (bytecount < totalbytes);

              break;

         case '\037':
         case KEY_HELP:
         case 'h':
         case '?':
              PagerHelp(cur);
              touchwin(stdscr);
              break;

         case 'p':
              if (SecureMode || NoShellMode) {
                   CursesErrorMsg(Gtxt("Sorry, you are not allowed to print files",161));
                   touchwin(stdscr);
                   break;
              }

              if (RCuseANSIprinter(GlobalRC) == TRUE) {
                   FILE *printit;
                   char *cp;
                   char printtmpstr[512];

                   printit = fopen(GSgetLocalFile(gs), "r");
                   if (printit == NULL) {
                        CursesErrorMsg(Gtxt("Cannot Open requested file..",71));
                        break;
                   }


                   CURexit(CursesScreen);

                   printf("Now printing on ANSI attached printer\n");
                   printf("\033[5i");
                   while (1) {

                        cp = fgets(printtmpstr, sizeof(printtmpstr), printit);
                        if (cp == NULL)
                             break;

                        fputs(cp, stdout);
                   }
                   fclose(printit);

                   printf("\f\033[4i");

                   printf(Gtxt("Press <RETURN> to continue",121));
                   getchar();
                   CURenter(CursesScreen);
                   touchwin(stdscr);

                   clearok(curscr, TRUE);
                   break;

              }
              if (!RCprintCommand(GlobalRC, GSgetLocalView(gs),
                  GSgetLocalFile(gs), command) ||
                  !strncasecmp(command, "- none -", 8) ||
                  strlen(command) == 0) {
                   CursesErrorMsg(Gtxt("Sorry, no method to print this document",156));
                   touchwin(stdscr);
                   break;
              }
              Dialogmess[0] = strdup(Gtxt("The filename is:",174));
              Dialogmess[1] = strdup(GSgetLocalFile(gs));
              Dialogmess[2] = NULL;

              if (CURDialog(cur, Gtxt("Print current document",122), Dialogmess) != -1) {
                   if (FIOsystem(command))
                       CursesErrorMsg(Gtxt("Encountered printing problem, sorry...",84));
              }

              free(Dialogmess[0]);
              free(Dialogmess[1]);

              touchwin(stdscr);
              clearok(curscr, TRUE);

              break;

         case 's':
              if (!(SecureMode || NoShellMode))
                   Save_file(gs, NULL, GSgetLocalView(gs));
              else
                   CursesErrorMsg(Gtxt("Sorry, you are not allowed to save files",162));

              touchwin(stdscr);
              break;

         case 'D':
              Download_file(gs);
              wclear(stdscr);
              PagerTitles(cur, gs, totalbytes);
              PagerSeekPage(thefile, currentpage-1, &bytecount);
              PagerNextPage(cur, thefile, theline, &bytecount, totalbytes);

              break;

         case 'm':
#ifdef NOMAIL
              if (SecureMode || NoShellMode) {
                   CursesErrorMsg(Gtxt("Sorry, you are not allowed to do this", 64));
                   touchwin(stdscr);
                   break;
              }
#endif


              GSmail(gs);
              wclear(stdscr);
              PagerTitles(cur, gs, totalbytes);
              PagerSeekPage(thefile, currentpage-1, &bytecount);
              PagerNextPage(cur, thefile, theline, &bytecount, totalbytes);
              break;

         case '/':
              /** Search ... ***/
              if ((CURGetOneOption(CursesScreen, "",
                                  Gtxt("Search text for:",141),
                                   slashstring) < 0) ||
                                  (slashstring[0] == '\0')) {
                   touchwin(stdscr);
                   break;
              }

         case 'n':
              /** Next occurrence, and fall through from above.. **/
              if (slashstring[0] == '\0') {
                   CursesErrorMsg(Gtxt("Use '/' to define search a first...",178));
                   touchwin(stdscr);
                   break;
              }

              savedpagenum = currentpage;

              if (ch == '/')
                   PagerSeekPage(thefile, currentpage-1, &bytecount);

              if (!PagerSearch(thefile, theline, &bytecount, slashstring)) {
                   CursesErrorMsg(Gtxt("Couldn't find text",82));
                   touchwin(stdscr);
                   PagerSeekPage(thefile, savedpagenum-1, &bytecount);
                   PagerNextPage(cur, thefile, theline, &bytecount,
                        totalbytes);
                   touchwin(stdscr);
                   break;
              }

              /* We found it... */
              PagerSeekPage(thefile, currentpage-1, &bytecount);
              PagerNextPage(cur, thefile, theline, &bytecount, totalbytes);
              touchwin(stdscr);
              break;

         default:
              CURBeep(cur);
              break;
         }

    }


    /*** Clean up.. ***/

    fclose(thefile);
    free(theline);
    PagePosFree();
}

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