horrible-harry/render.cpp

#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h> // usleep

#include "render.h"
#include "terminal.h"
#include "zf_log.h"

extern const char *strnstr(const char *source, int len, const char *needle);
extern const char *repr(const char *data);
extern struct console_details console;

struct render current_render;
int render_overlimit = 0;

void reset_render(void) {
  current_render.speed = 0;
  current_render.effect = 0;
  render_overlimit = 0;
}

int ms_sleep(unsigned int ms) {
  int result = 0;
  struct timespec ts = {ms / 1000, (ms % 1000) * 1000000L};

  do {
    struct timespec ts_sleep = ts;
    result = nanosleep(&ts_sleep, &ts);
  } while ((-1 == result));
  return result;
}

void render_sleep(void) {
  if (render_overlimit)
    return;

  if (current_render.speed) { // * 100 still too slow.
    ms_sleep(current_render.speed * 10);
  }
}

/*
Well SNAP!  Mystic numbers don't remotely match ANSI color codes.

 00 : Sets the current foreground to Black          0;30
 01 : Sets the current foreground to Dark Blue      0;34
 02 : Sets the current foreground to Dark Green     0;32
 03 : Sets the current foreground to Dark Cyan      0;36
 04 : Sets the current foreground to Dark Red       0;31
 05 : Sets the current foreground to Dark Magenta   0;35
 06 : Sets the current foreground to Brown          0;33
 07 : Sets the current foreground to Grey           0;37
 08 : Sets the current foreground to Dark Grey      1;30
 09 : Sets the current foreground to Light Blue     1;34
 10 : Sets the current foreground to Light Green    1;32
 11 : Sets the current foreground to Light Cyan     1;36
 12 : Sets the current foreground to Light Red      1;31
 13 : Sets the current foreground to Light Magenta  1;35
 14 : Sets the current foreground to Yellow         1;33
 15 : Sets the current foreground to White          1;37

 16 : Sets the current background to Black          40
 17 : Sets the current background to Blue           44
 18 : Sets the current background to Green          42
 19 : Sets the current background to Cyan           46
 20 : Sets the current background to Red            41
 21 : Sets the current background to Magenta        45
 22 : Sets the current background to Brown          43
 23 : Sets the current background to Grey           47

 24 : Sets the current background to black with blinking foreground     5;40
 25 : Sets the current background to blue with blinking foreground      5;44
 26 : Sets the current background to green with blinking foreground     5;42
 27 : Sets the current background to cyan with blinking foreground      5;46
 28 : Sets the current background to red with blinking foreground       5;41
 29 : Sets the current background to magenta with blinking foreground   5;45
 30 : Sets the current background to brown with blinking foreground     5;43
 31 : Sets the current background to grey with blinking foreground      5;47

Other things that Mystic does ...

  [A## - Move the cursor up ## lines
  [B## - Move the cursor down ## lines
  [C## - Move the cursor forward (to the right) ## columns
  [D## - Move the cursor backwards (to the left) ## columns
  [K   - Clear from the current cursor position to the end of the line
  [L   - Move cursor and erase data backwards from current column to column ##
  [X## - Move cursor to X coordinate ##
  [Y## - Move cursor to Y coordinate ##
  BS   - Sends 1 destructive backspace sequence (ASCII 8-32-8)
  CL   - Clears the screen (ANSI 1,1 locate and [2J or ASCII 12)
  CR   - Send a carrage return and line feed (move to next line)
  RA   - Restore the saved text attribute color
  RS   - Restore the saved user's terminal screen
  SA   - Save the current text attribute color
  SS   - Save the entire user's terminal screen

 */

// Covert MYSTIC color to (Proper) ANSI COLOR.

const int MYSTIC[] = {0, 4, 2, 6, 1, 5, 3, 7};

// ANSI_color = MYSTIC[ odd_mystic_color % 8 ]

void write_color(int fd, int color) {
  char buffer[12];
  int slen;

  switch (color) {
  case 0:
  case 1:
  case 2:
  case 3:
  case 4:
  case 5:
  case 6:
  case 7:
    slen = snprintf(buffer, sizeof(buffer), "\x1b[0;3%dm", MYSTIC[color]);
    if (slen >= sizeof(buffer)) {
      ZF_LOGE("snprintf failed write_color(%d)", color);
    }
    break;
  case 8:
  case 9:
  case 10:
  case 11:
  case 12:
  case 13:
  case 14:
  case 15:
    slen = snprintf(buffer, sizeof(buffer), "\x1b[0;1;3%dm", MYSTIC[color - 8]);
    if (slen >= sizeof(buffer)) {
      ZF_LOGE("snprintf failed write_color(%d)", color);
    }
    break;
  case 16:
  case 17:
  case 18:
  case 19:
  case 20:
  case 21:
  case 22:
  case 23:
    slen = snprintf(buffer, sizeof(buffer), "\x1b[4%dm", MYSTIC[color - 16]);
    if (slen >= sizeof(buffer)) {
      ZF_LOGE("snprintf failed write_color(%d)", color);
    }
    break;
  case 24:
  case 25:
  case 26:
  case 27:
  case 28:
  case 29:
  case 30:
  case 31:
    slen = snprintf(buffer, sizeof(buffer), "\x1b[5;4%dm", MYSTIC[color - 24]);
    if (slen >= sizeof(buffer)) {
      ZF_LOGE("snprintf failed write_color(%d)", color);
    }
    break;
  default:
    buffer[0] = 0;
    break;
  }
  ZF_LOGD("write_color( %d ): %s", color, repr(buffer));
  write(fd, buffer, strlen(buffer));
}

int send_file(int fd, char *filename) {
  FILE *fp;
  char buffer[100];
  int read;

  fp = fopen(filename, "rb");
  if (fp == NULL) {
    ZF_LOGD("Failed to open %s", filename);
    return 0;
  }

  while ((read = fread(buffer, 1, sizeof(buffer), fp)) > 0) {
    write(fd, buffer, read);
  };
  fclose(fp);
  return 1;
}

void send_goto(int fd, int x, int y) {
  char gbuffer[16];

  sprintf(gbuffer, "\x1b[%d;%dH", y, x);
  write(fd, gbuffer, strlen(gbuffer));
}

int send_file(int fd, int x, int y, char *filename) {
  FILE *fp;
  char buffer[100];
  int read;

  fp = fopen(filename, "rb");
  if (fp == NULL) {
    ZF_LOGD("Failed to open %s", filename);
    return 0;
  }

  send_goto(fd, x, y);
  y++;

  while ((read = fread(buffer, 1, sizeof(buffer), fp)) > 0) {
    char *cp, *last_cp;

    buffer[read] = 0;
    last_cp = buffer;
    while ((cp = strchr(last_cp, '\n')) != NULL) {
      *cp = 0;
      write(fd, last_cp, strlen(last_cp));
      send_goto(fd, x, y);
      y++;
      last_cp = cp + 1;
    };
    write(fd, last_cp, strlen(last_cp));
  };
  fclose(fp);
  return 1;
}

/**
 * process_trigger( fd, *cp )
 *
 * This process a command trigger.
 * It has seen TRIGGER, and now it is
 * processing whatever comes after it.
 * It will perform the process, and
 * return the char * of whatever is next.
 */
const char *process_trigger(int fd, const char *cp) {
  char ch;
  int i, x, y;
  ch = *cp;
  cp++;

  switch (ch) {
  case 'D':
    i = 0;
    if (isdigit(*cp)) {
      i = (*cp) - '0';
      cp++;
    };
    if (isdigit(*cp)) {
      i *= 10;
      i += (*cp) - '0';
      cp++;
    };

    if ((i > 0) && (i < 80)) {
      ZF_LOGI("DEL %02d", i);

      for (x = 0; x < i; x++) {
        write(fd, "\b \b", 3);
      }
    };
    break;

  case 'C': {
    i = 0;
    if (*cp == 'R') {
      cp++;
      const char *restore = color_restore(&console);
      write(fd, restore, strlen(restore));
      break;
    }
    if (isdigit(*cp)) {
      i = (*cp) - '0';
      cp++;
    };
    if (isdigit(*cp)) {
      i *= 10;
      i += (*cp) - '0';
      cp++;
    };
    write_color(fd, i);
  } break;

  case 'F':
  case 'f': {
    int pos = 0;
    if (ch == 'f') {
      pos = 1;
      x = (*cp) - '0';
      cp++;
      x *= 10;
      x += (*cp) - '0';
      cp++;
      y = (*cp) - '0';
      cp++;
      y *= 10;
      y += (*cp) - '0';
      cp++;
      ZF_LOGI("file at (%d, %d)", x, y);
    }
    // Ok, look for filename
    char ansifile[32] = "./hh/";
    char *ap = ansifile + strlen(ansifile);
    while (*cp != '.') {
      *ap = *cp;
      ap++;
      *ap = 0;
      cp++;
    };
    strcat(ansifile, ".ans");
    cp++;
    ZF_LOGD("FILE [%s]", ansifile);
    if (pos) {
      send_file(fd, x, y, ansifile);
    } else {
      send_file(fd, ansifile);
    };
  } break;

  case 'G': {
    x = 0;
    if (isdigit(*cp)) {
      x = (*cp) - '0';
      cp++;
    };
    if (isdigit(*cp)) {
      x *= 10;
      x += (*cp) - '0';
      cp++;
    };
    y = 0;
    if (isdigit(*cp)) {
      y = (*cp) - '0';
      cp++;
    };
    if (isdigit(*cp)) {
      y *= 10;
      y += (*cp) - '0';
      cp++;
    };
    char buffer[20]; // row ; column H
    ZF_LOGD("GOTO (%d,%d)", x, y);
    sprintf(buffer, "\x1b[%d;%dH", y, x);
    write(fd, buffer, strlen(buffer));
  } break;

  case 'R': {
    i = 0;
    if (isdigit(*cp)) {
      i = (*cp) - '0';
      cp++;
    };
    if ((i > 0) && (i < 10)) {
      ZF_LOGI("RENDER %d", i);
      current_render.effect = i;
    } else {
      current_render.effect = 0;
    }
  } break;
  case 'S': {
    i = 0;
    if (isdigit(*cp)) {
      i = (*cp) - '0';
      cp++;
    };
    if ((i > 0) && (i < 10)) {
      ZF_LOGI("SPEED %d", i);
      current_render.speed = i;
    } else {
      current_render.speed = 0;
    }
  } break;
  case 'P': {
    i = 0;
    if (isdigit(*cp)) {
      i = (*cp) - '0';
      cp++;
    };
    if ((i > 0) && (i < 10)) {
      ZF_LOGI("PAWS %d", i);
      // sleep(i);
      if (!render_overlimit) {
        sleep(i);
      };
    }
  } break;
  }
  return cp;
}

/**
 * render_effect( fd, ch )
 *
 * Displays the given character with whatever
 * rendering effect is currently active.
 * (If any).
 */
void render_effect(int fd, char ch) {
  int effect = current_render.effect;
  int l;
  char space = ' ';
  char bs = '\b';

  switch (effect) {
  case 1:
    // CHAR + SPC + BS
    render_sleep();
    write(fd, &ch, 1);
    render_sleep();
    write(fd, &space, 1);
    render_sleep();
    render_sleep();
    write(fd, &bs, 1);
    break;
  case 2:
    // CHAR + 8 spaces + 8 BS
    render_sleep();
    write(fd, &ch, 1);
    for (l = 0; l < 8; l++) {
      render_sleep();
      write(fd, &space, 1);
    }
    for (l = 0; l < 8; l++) {
      render_sleep();
      write(fd, &bs, 1);
    }
    break;
  case 0:
  default:
    // NORMAL
    render_sleep();
    write(fd, &ch, 1);
    break;
  }
}

/**
 * render( fd, string_out )
 *
 * Render an entire string.
 * Handles TRIGGER.
 * Renders with effects.
 */
void render(int fd, const char *string_out, int len) {
  const char *cp = string_out;
  const char *trigger = cp;

  time_t start = time(NULL);
  int elapsed;
  int over = 0;

  reset_render();

  // ZF_LOGV("render(%d, %s)", fd, repr(string_out));
  ZF_LOGV_MEM(string_out, len, "render(%d, %d bytes):", fd, len);

  // Check our time from time to time.
  // If we start running long, disable sleeps.

  while ((trigger = strnstr(cp, len - (cp - string_out), TRIGGER)) != NULL) {
    // There is special things to handle in here.
    while (cp != trigger) {
      elapsed = time(NULL) - start;
      if (elapsed > SLEEP_LIMIT) {
        render_overlimit = 1;
        current_render.speed = 0;
      };

      // write(fd, cp, 1 );
      render_effect(fd, *cp);
      cp++;
    };

    // ZF_LOGI( "at trigger: (%s)", cp);
    cp += strlen(TRIGGER);

    // Ok, we're pointing at the trigger -- do something.
    cp = process_trigger(fd, cp);

    // ZF_LOGI( "after trigger: (%s)", cp);
  };

  // We still might be under a rendering effect.
  while (cp < (string_out + len)) {
    elapsed = time(NULL) - start;
    if (elapsed > SLEEP_LIMIT) {
      render_overlimit = 1;
      current_render.speed = 0;
    };
    // write(fd, cp, 1);
    render_effect(fd, *cp);
    cp++;
  }
}