cmdedit.cxx

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/********************************************************************\
 
  Name:         cmdedit.c
  Created by:   Stefan Ritt
 
  Contents:     Command-line editor for ODBEdit
 
  $Id:$
 
\********************************************************************/
 
#include "midas.h"
#include "msystem.h"
 
#ifdef OS_MSDOS
#define MAX_HISTORY 10
#else
#define MAX_HISTORY 50
#endif
 
#define LINE_LENGTH 256
 
char history[MAX_HISTORY][LINE_LENGTH];
INT his_index = 0;
 
#ifdef OS_VMS
 
INT cmd_edit(const char *prompt, char *cmd, INT(*dir) (char *, INT *), INT(*idle) ())
{
   printf(prompt);
   ss_gets(cmd, 256);
 
   return strlen(cmd);
}
 
#else
 
INT cmd_edit(const char *prompt, char *cmd, INT(*dir) (char *, INT *), INT(*idle) ())
{
   char line[LINE_LENGTH];
   INT i, j, k, c, hi;
   INT status;
   DWORD last_time = 0;
   BOOL escape_flag = 0;
 
   if (ss_getchar(0) == -1) {
      /* normal input if ss_getchar not supported */
      fputs(prompt, stdout);
      ss_gets(cmd, 256);
      return strlen(cmd);
   }
 
   fputs(prompt, stdout);
   fflush(stdout);
 
   hi = his_index;
   memset(line, 0, LINE_LENGTH);
   memset(history[hi], 0, LINE_LENGTH);
   strcpy(line, cmd);
   fputs(line, stdout);
   i = strlen(cmd);
   fflush(stdout);
 
   do {
      c = ss_getchar(0);
 
      if (c == 27)
         escape_flag = TRUE;
 
      if (c >= ' ' && c < CH_EXT && escape_flag) {
         escape_flag = FALSE;
         if (c == 'p')
            c = 6;
      }
 
      /* normal input */
      if (c >= ' ' && c < CH_EXT) {
         if (strlen(line) < LINE_LENGTH - 1) {
            for (j = strlen(line); j >= i; j--)
               line[j + 1] = line[j];
            if (i < LINE_LENGTH - 1) {
               line[i++] = c;
               fputc(c, stdout);
            }
            for (j = i; j < (INT) strlen(line); j++)
               fputc(line[j], stdout);
            for (j = i; j < (INT) strlen(line); j++)
               fputc('\b', stdout);
         }
      }
 
      /* BS */
      if (c == CH_BS && i > 0) {
         i--;
         fputc('\b', stdout);
         for (j = i; j <= (INT) strlen(line); j++) {
            line[j] = line[j + 1];
            if (line[j])
               fputc(line[j], stdout);
            else
               fputc(' ', stdout);
         }
         for (k = 0; k < j - i; k++)
            fputc('\b', stdout);
      }
 
      /* DELETE/Ctrl-D */
      if (c == CH_DELETE || c == 4) {
         for (j = i; j <= (INT) strlen(line); j++) {
            line[j] = line[j + 1];
            if (line[j])
               fputc(line[j], stdout);
            else
               fputc(' ', stdout);
         }
         for (k = 0; k < j - i; k++)
            fputc('\b', stdout);
      }
 
      /* Erase line: CTRL-W, CTRL-U */
      if (c == 23 || c == 21) {
         i = strlen(line);
         memset(line, 0, sizeof(line));
         printf("\r%s", prompt);
         for (j = 0; j < i; j++)
            fputc(' ', stdout);
         for (j = 0; j < i; j++)
            fputc('\b', stdout);
         i = 0;
      }
 
      /* Erase line from cursor: CTRL-K */
      if (c == 11) {
         for (j = i; j < (INT) strlen(line); j++)
            fputc(' ', stdout);
         for (j = i; j < (INT) strlen(line); j++)
            fputc('\b', stdout);
         for (j = strlen(line); j >= i; j--)
            line[j] = 0;
      }
 
      /* left arrow, CTRL-B */
      if ((c == CH_LEFT || c == 2) && i > 0) {
         i--;
         fputc('\b', stdout);
      }
 
      /* right arrow, CTRL-F */
      if ((c == CH_RIGHT || c == 6) && i < (INT) strlen(line))
         fputc(line[i++], stdout);
 
      /* HOME, CTRL-A */
      if ((c == CH_HOME || c == 1) && i > 0) {
         for (j = 0; j < i; j++)
            fputc('\b', stdout);
         i = 0;
      }
 
      /* END, CTRL-E */
      if ((c == CH_END || c == 5) && i < (INT) strlen(line)) {
         for (j = i; j < (INT) strlen(line); j++)
            fputc(line[i++], stdout);
         i = strlen(line);
      }
 
      /* up arrow / CTRL-P */
      if (c == CH_UP || c == 16) {
         if (history[(hi + MAX_HISTORY - 1) % MAX_HISTORY][0]) {
            hi = (hi + MAX_HISTORY - 1) % MAX_HISTORY;
            i = strlen(line);
            fputc('\r', stdout);
            fputs(prompt, stdout);
            for (j = 0; j < i; j++)
               fputc(' ', stdout);
            for (j = 0; j < i; j++)
               fputc('\b', stdout);
            memcpy(line, history[hi], 256);
            i = strlen(line);
            for (j = 0; j < i; j++)
               fputc(line[j], stdout);
         }
      }
 
      /* down arrow / CTRL-N */
      if (c == CH_DOWN || c == 14) {
         if (history[hi][0]) {
            hi = (hi + 1) % MAX_HISTORY;
            i = strlen(line);
            fputc('\r', stdout);
            fputs(prompt, stdout);
            for (j = 0; j < i; j++)
               fputc(' ', stdout);
            for (j = 0; j < i; j++)
               fputc('\b', stdout);
            memcpy(line, history[hi], 256);
            i = strlen(line);
            for (j = 0; j < i; j++)
               fputc(line[j], stdout);
         }
      }
 
      /* CTRL-F */
      if (c == 6) {
         for (j = (hi + MAX_HISTORY - 1) % MAX_HISTORY; j != hi;
              j = (j + MAX_HISTORY - 1) % MAX_HISTORY)
            if (history[j][0] && strncmp(line, history[j], i) == 0) {
               memcpy(line, history[j], 256);
               fputs(line + i, stdout);
               i = strlen(line);
               break;
            }
         if (j == hi)
            fputc(7, stdout);
      }
 
      /* tab */
      if (c == 9 && dir != NULL) {
         status = dir(line, &i);
 
         /* redraw line */
         fputc('\r', stdout);
         fputs(prompt, stdout);
         fputs(line, stdout);
 
         for (j = 0; j < (INT) strlen(line) - i; j++)
            fputc('\b', stdout);
      }
 
      if (c != 0) {
         last_time = ss_millitime();
         fflush(stdout);
      }
 
      if ((ss_millitime() - last_time > 300) && idle != NULL) {
         status = idle();
 
         if (status) {
            fputc('\r', stdout);
            fputs(prompt, stdout);
            fputs(line, stdout);
 
            for (j = 0; j < (INT) strlen(line) - i; j++)
               fputc('\b', stdout);
 
            fflush(stdout);
         }
      }
 
   } while (c != CH_CR && c != CH_LF);
 
   strcpy(cmd, line);
 
   if (dir != NULL)
      if (strcmp(cmd, history[(his_index + MAX_HISTORY - 1) % MAX_HISTORY]) != 0 &&
          cmd[0]) {
         strcpy(history[his_index], cmd);
         his_index = (his_index + 1) % MAX_HISTORY;
      }
 
   /* reset terminal */
   ss_getchar(1);
 
   fputc('\n', stdout);
 
   return strlen(line);
}
 
#endif