horrible-harry/terminal.cpp

/*
Terminal tracking

Actually, I believe I only really need to track the color information.
Everything else, I'm not sure I really care about.   (NNY!)

 */

#include "terminal.h"
#include "utils.h"
#include "zf_log.h"
#include <ctype.h>
#include <sstream>
#include <stdio.h> // snprintf
#include <stdlib.h>
#include <string.h>
#include <vector>

Terminal::Terminal() { this->init(); }

void Terminal::init(void) {
  this->posx = this->posy = 0;
  this->in_ansi = 0;
  this->fgcolor = 7;
  this->bgcolor = 0;
  this->status = 0;
  this->saved_cursor_position.clear();
}

void Terminal::ansi_color(int color) {
  // ZF_LOGV("ansi_color(%d)", color);
  if (color == 0) {
    this->status = 0;
    this->fgcolor = 7;
    this->bgcolor = 0;
    return;
  }
  if ((color == 1) || (color == 2) || (color == 3) || (color == 4) ||
      (color == 5)) {
    this->status = color;
    return;
  }
  if ((color >= 30) && (color <= 37)) {
    this->fgcolor = color - 30;
    return;
  }
  if ((color >= 40) && (color <= 47)) {
    this->bgcolor = color - 40;
    return;
  }
  if (color == 39) {
    // default fg color
    this->fgcolor = 7;
    return;
  }
  if (color == 49) {
    // default bg color
    this->bgcolor = 0;
    return;
  }
  ZF_LOGD("ansi_color( %d ) is unknown to me.", color);
}

std::string Terminal::color_restore(void) {
  std::ostringstream oss;

  // possible optimize:  If fg is 7, don't set (0 reset does that), if bg is 0,
  // don't set (0 does that)

  if (this->status == 0) {
    oss << "\x1b[0;" << this->fgcolor + 30 << ";" << this->bgcolor + 40 << "m";
  } else {
    oss << "\x1b[0;" << this->status << ";" << this->fgcolor + 30 << ";"
        << this->bgcolor + 40 << "m";
  }

  std::string buffer = oss.str();
  return buffer;
}

Terminal::ANSI_TYPE Terminal::ansi_code(std::string ansi) {
  std::string::iterator cp = ansi.begin();
  std::string::iterator last = ansi.end() - 1;

  int number, number2;

  if (*cp == '\x1b') {
    ++cp;
    // Ok, that's expected.
    if (*cp == '[') {
      ++cp;

      // https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_sequences

      switch (*last) {
      case 'A':
        // cursor up
        if (cp == last) {
          number = 1;
        } else {
          number = std::stoi(std::string(cp, last));
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi.c_str()),
                    number);
            number = 1;
          }
        };
        this->posy -= number;
        if (this->posy < 0) {
          this->posy = 0;
          ZF_LOGD(
              "console_ansi( %s ): attempt to move above top of screen (%d)",
              repr(ansi.c_str()), number);
        }
        return CURSOR;
      case 'B':
        // cursor down
        if (cp == last) {
          number = 1;
        } else {
          number = std::stoi(std::string(cp, last));
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi.c_str()),
                    number);
            number = 1;
          }
        };
        this->posy += number;
        // check range/"scroll"
        return CURSOR;

      case 'C':
        // cursor forward
        if (cp == last) {
          number = 1;
        } else {
          number = std::stoi(std::string(cp, last));
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi.c_str()),
                    number);
            number = 1;
          }
        };
        this->posx += number;

        // Well.  According to the "spec", the screen limits are hard
        // If the cursor is already at the edge of the screen, this has no
        // effect. ^ This is *NOT* how any ANSI BBS terminal program acts!

        while (this->posx > 79) {
          this->posy++;
          // check range/"scroll"
          this->posx -= 79;
        }
        return CURSOR;

      case 'D':
        // cursor backwards
        if (cp == last) {
          number = 1;
        } else {
          number = std::stoi(std::string(cp, last));
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi.c_str()),
                    number);
            number = 0;
          }
        };
        this->posx -= number;

        // Well.  According to the "spec", the screen limits are hard
        // If the cursor is already at the edge of the screen, this has no
        // effect. ^ This is *NOT* how any ANSI BBS terminal program acts!

        while (this->posx < 0) {
          this->posy--;
          if (this->posy < 0) {
            this->posy = 0;
          }
          this->posx += 79;
        }
        return CURSOR;

      case 'H':
        // cursor position

        if (*cp == ';') {
          // Missing first number
          number = 1;
          ++cp;
          if (cp == last) {
            // missing 2nd number as well?
            number2 = 1;
          } else {
            number2 = std::stoi(std::string(cp, last));
          }
        } else {
          // Ok, find the first number
          number = std::stoi(std::string(cp, last));

          // covert iterator to position
          std::size_t pos = ansi.find(';', std::distance(ansi.begin(), cp));

          if (pos == std::string::npos) {
            // Missing 2nd number
            number2 = 1;
          } else {
            // 2nd number found, maybe.
            cp = ansi.begin() + pos;
            ++cp;
            if (cp == last) {
              number2 = 1;
            } else {
              number2 = std::stoi(std::string(cp, last));
            }
          }
        }

        // Our positions start at zero, not one.
        this->posy = number - 1;
        this->posx = number2 - 1;
        return CURSOR;

      case 'J':
        // clear
        if (cp == last) {
          number = 0;
        } else {
          number = std::stoi(std::string(cp, last));
        };

        // clears ... part of the screen.
        if (number == 2) {
          this->posx = 0;
          this->posy = 0;
        };
        return CLEAR;

      case 'K':
        // clear line
        if (cp == last) {
          number = 0;
        } else {
          number = std::stoi(std::string(cp, last));
        };
        return CLEAR;

      case 'm':
        // color
        if (cp == last) {
          // nothing given, default to 0.
          number = 0;
          ansi_color(number);
        } else {
          while (cp != last) {
            number = std::stoi(std::string(cp, last));
            ansi_color(number);
            ++cp;

            while ((cp != last) && (isdigit(*cp))) {
              ++cp;
            };

            if (cp != last) {
              if (*cp == ';') {
                cp++;
              }
            }
          }
        }
        return COLOR;

      case 's':
        // save position
        saved_cursor_position.push_back(std::make_pair(this->posx, this->posy));
        return CURSOR;
      case 'u':
        // restore position
        if (saved_cursor_position.empty()) {
          ZF_LOGE("Restore cursor position from empty history.");
        } else {
          std::pair<int, int> pos = saved_cursor_position.back();
          this->posx = pos.first;
          this->posy = pos.second;
          saved_cursor_position.pop_back();
        }
        return CURSOR;

      case 't':
      case 'r':
      case 'h':
      case '!':
        // These are ones that I don't care about.
      case 'n': // This is terminal detect -- give me cursor position
        return OTHER;

      default:
        // unsure -- possibly not important
        ZF_LOGD("console_ansi( %s ): ???", repr(ansi.c_str()));
        return OTHER;
      }
    }
  }
  ZF_LOGD("console_ansi( %s ) : ???", repr(ansi.c_str()));
  return OTHER;
}

Terminal::termchar Terminal::putchar(char ch) {
  Terminal::termchar tc;

  if (this->in_ansi) {
    // Ok, append this char
    this->ansi.append(1, ch);

    if (isalpha(ch)) {
      // Ok!  end of ANSI code, process it.
      tc.ansi = ansi_code(this->ansi);
      this->in_ansi = 0;
      this->ansi.clear();
      tc.in_ansi = 1;
      return tc;
    }
    tc.ansi = START;
    tc.in_ansi = 1;
    return tc;
  } else {
    tc.ansi = START;
    tc.in_ansi = 0;

    if (ch == '\x1b') {
      this->ansi.append(1, ch);
      this->in_ansi = 1;
      tc.in_ansi = 1;
      return tc;
    }

    // should I try reporting MOTION non-ANSI ?
    if (ch == '\r') {
      // Carriage return
      this->posx = 0;
      return tc;
    }
    if (ch == '\n') {
      this->posy++;
      // check range/"scroll"
      return tc;
    }
    if (ch == '\b') {
      // Backspace.
      if (this->posx > 0) {
        this->posx--;
      }
      return tc;
    }
    if (ch == '\f') {
      // form feed
      // treat as clear screen
      this->posx = 0;
      this->posy = 0;
      return tc;
    }

    /*
      I don't believe that anything else can possibly be here, other then an
      actual printable character.  So!

      FUTURE: Store the screen text + colors
    */

    this->posx++;

    if (this->posx > 79) {
      this->posx = 0;
      this->posy++;
      // check range/"scroll"
    }
    return tc;
  }
}

void Terminal::putstring(std::string text) {
  // This gets noisy when called from render effect ^D
  // ZF_LOGI("console_char %lu chars", chars.size());

  for (auto strit = text.begin(); strit != text.end(); strit++)
    putchar(*strit);
}


// Old non-C++ ways

void console_init(struct console_details *cdp) {
  cdp->posx = 0;
  cdp->posy = 0;
  cdp->savedx = 0;
  cdp->savedy = 0;
  cdp->in_ansi = 0;
  cdp->fgcolor = 7;
  cdp->bgcolor = 0;
  cdp->status = 0;
}

/*
 * Given the ansi number codes
 * Figure out fg, bg and status.
 */
void ansi_color(struct console_details *cdp, int color) {
  // ZF_LOGV("ansi_color(%d)", color);
  if (color == 0) {
    cdp->status = 0;
    cdp->fgcolor = 7;
    cdp->bgcolor = 0;
    return;
  }
  if ((color == 1) || (color == 2) || (color == 3) || (color == 4) ||
      (color == 5)) {
    cdp->status = color;
    return;
  }
  if ((color >= 30) && (color <= 37)) {
    cdp->fgcolor = color - 30;
    return;
  }
  if ((color >= 40) && (color <= 47)) {
    cdp->bgcolor = color - 40;
    return;
  }
  if (color == 39) {
    // default fg color
    cdp->fgcolor = 7;
    return;
  }
  if (color == 49) {
    // default bg color
    cdp->bgcolor = 0;
    return;
  }
  ZF_LOGD("ansi_color( %d ) is unknown to me.", color);
}

const char *color_restore(struct console_details *cdp) {
  static char buffer[30];
  int slen;

  // possible optimize:  If fg is 7, don't set (0 reset does that), if bg is 0,
  // don't set (0 does that)

  if (cdp->status == 0) {
    slen = snprintf(buffer, sizeof(buffer), "\x1b[0;3%d;4%dm", cdp->fgcolor,
                    cdp->bgcolor);
    if (slen >= (int)sizeof(buffer)) {
      ZF_LOGE("snprintf %d > size %d", slen, (int)sizeof(buffer));
      buffer[0] = 0;
    }
  } else {
    slen = snprintf(buffer, sizeof(buffer), "\x1b[0;%d;3%d;4%dm", cdp->status,
                    cdp->fgcolor, cdp->bgcolor);
    if (slen >= (int)sizeof(buffer)) {
      ZF_LOGE("snprintf %d > size %d", slen, (int)sizeof(buffer));
      buffer[0] = 0;
    }
  };
  return buffer;
}

/* store cursor position X,Y */
std::vector<std::pair<int, int>> cursor_position_history;

ANSI_TYPE console_ansi(struct console_details *cdp, const char *ansi) {
  const char *cp = ansi;
  const char *last = ansi + strlen(ansi) - 1;
  int number, number2;

  if (*cp == '\x1b') {
    cp++;
    // Ok, that's expected.
    if (*cp == '[') {
      cp++;

      // https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_sequences

      switch (*last) {
      case 'A':
        // cursor up
        if (cp == last) {
          number = 1;
        } else {
          number = atoi(cp);
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi),
                    number);
            number = 1;
          }
        };
        cdp->posy -= number;
        if (cdp->posy < 0) {
          cdp->posy = 0;
          ZF_LOGD(
              "console_ansi( %s ): attempt to move above top of screen (%d)",
              repr(ansi), number);
        }
        return CURSOR;
      case 'B':
        // cursor down
        if (cp == last) {
          number = 1;
        } else {
          number = atoi(cp);
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi),
                    number);
            number = 1;
          }
        };
        cdp->posy += number;
        // check range/"scroll"
        return CURSOR;

      case 'C':
        // cursor forward
        if (cp == last) {
          number = 1;
        } else {
          number = atoi(cp);
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi),
                    number);
            number = 1;
          }
        };
        cdp->posx += number;

        // Well.  According to the "spec", the screen limits are hard
        // If the cursor is already at the edge of the screen, this has no
        // effect. ^ This is *NOT* how any ANSI BBS terminal program acts!

        while (cdp->posx > 79) {
          cdp->posy++;
          // check range/"scroll"
          cdp->posx -= 79;
        }
        return CURSOR;

      case 'D':
        // cursor backwards
        if (cp == last) {
          number = 1;
        } else {
          number = atoi(cp);
          if (number < 1) {
            ZF_LOGD("console_ansi( %s ): number error (%d)", repr(ansi),
                    number);
            number = 0;
          }
        };
        cdp->posx -= number;

        // Well.  According to the "spec", the screen limits are hard
        // If the cursor is already at the edge of the screen, this has no
        // effect. ^ This is *NOT* how any ANSI BBS terminal program acts!

        while (cdp->posx < 0) {
          cdp->posy--;
          if (cdp->posy < 0) {
            cdp->posy = 0;
          }
          cdp->posx += 79;
        }
        return CURSOR;

      case 'H':
        // cursor position

        if (*cp == ';') {
          // Missing first number
          number = 1;
          cp++;
          if (cp == last) {
            // missing 2nd number as well?
            number2 = 1;
          } else {
            number2 = atoi(cp);
          }
        } else {
          // Ok, find the first number
          number = atoi(cp);

          cp = strchr(cp, ';');
          if (cp == NULL) {
            // Missing 2nd number
            number2 = 1;
          } else {
            // 2nd number found, maybe.
            cp++;
            if (cp == last) {
              number2 = 1;
            } else {
              number2 = atoi(cp);
            }
          }
        }

        // Our positions start at zero, not one.
        cdp->posy = number - 1;
        cdp->posx = number2 - 1;
        return CURSOR;

      case 'J':
        // clear
        if (cp == last) {
          number = 0;
        } else {
          number = atoi(cp);
        };

        // clears ... part of the screen.
        if (number == 2) {
          cdp->posx = 0;
          cdp->posy = 0;
        };
        return CLEAR;

      case 'K':
        // clear line
        if (cp == last) {
          number = 0;
        } else {
          number = atoi(cp);
        };
        return CLEAR;

      case 'm':
        // color
        if (cp == last) {
          // nothing given, default to 0.
          number = 0;
          ansi_color(cdp, number);
        } else {
          while (cp != last) {
            number = atoi(cp);
            ansi_color(cdp, number);
            cp++;

            while ((cp != last) && (isdigit(*cp))) {
              cp++;
            };

            if (cp != last) {
              if (*cp == ';') {
                cp++;
              }
            }
          }
        }
        return COLOR;

      case 's':
        // save position
        cursor_position_history.push_back(std::make_pair(cdp->posx, cdp->posy));
        return CURSOR;
      case 'u':
        // restore position
        if (cursor_position_history.empty()) {
          ZF_LOGE("Restore cursor position from empty history.");
        } else {
          std::pair<int, int> pos = cursor_position_history.back();
          cdp->posx = pos.first;
          cdp->posy = pos.second;
          cursor_position_history.pop_back();
        }
        return CURSOR;

      case 't':
      case 'r':
      case 'h':
      case '!':
        // These are ones that I don't care about.
      case 'n': // This is terminal detect -- give me cursor position
        return OTHER;

      default:
        // unsure -- possibly not important
        ZF_LOGD("console_ansi( %s ): ???", repr(ansi));
        return OTHER;
      }
    }
  }
  ZF_LOGD("console_ansi( %s ) : ???", repr(ansi));
  return OTHER;
}

/*
 * console_char()
 *  return whether or not we are still in_ansi
 *
 * in_ansi TRUE: START (receiving start of/fragment of ANSI)
 *               CURSOR, COLOR, CLEAR, OTHER
 *               Results of the last ANSI parse.
 * in_ansi FALSE: START Normal character.
 *
 */
termchar console_char(struct console_details *cdp, char ch) {
  char *cp;
  termchar tc;

  if (cdp->in_ansi) {
    // Ok, append this char
    cp = cdp->ansi + strlen(cdp->ansi);
    *cp = ch;
    cp++;
    *cp = 0;
    if (isalpha(ch)) {
      // Ok!  end of ANSI code, process it.
      tc.ansi = console_ansi(cdp, cdp->ansi);
      cdp->in_ansi = 0;
      cdp->ansi[0] = 0;
      tc.in_ansi = 1;
      return tc;
    }
    tc.ansi = START;
    tc.in_ansi = 1;
    return tc;
  } else {

    tc.ansi = START;
    tc.in_ansi = 0;

    if (ch == '\x1b') {
      cp = cdp->ansi;
      *cp = ch;
      cp++;
      *cp = 0;
      cdp->in_ansi = 1;
      tc.in_ansi = 1;
      return tc;
    }

    // should I try reporting MOTION non-ANSI ?
    if (ch == '\r') {
      // Carriage return
      cdp->posx = 0;
      return tc;
    }
    if (ch == '\n') {
      cdp->posy++;
      // check range/"scroll"
      return tc;
    }
    if (ch == '\b') {
      // Backspace.
      if (cdp->posx > 0) {
        cdp->posx--;
      }
      return tc;
    }
    if (ch == '\f') {
      // form feed
      // treat as clear screen
      cdp->posx = 0;
      cdp->posy = 0;
      return tc;
    }

    /*
      I don't believe that anything else can possibly be here, other then an
      actual printable character.  So!

      FUTURE: Store the screen text + colors
    */

    cdp->posx++;

    if (cdp->posx > 79) {
      cdp->posx = 0;
      cdp->posy++;
      // check range/"scroll"
    }
    return tc;
  }
}

void console_receive(struct console_details *cdp, std::string chars) {
  // This gets noisy when called from render effect ^D
  // ZF_LOGI("console_char %lu chars", chars.size());

  for (auto strit = chars.begin(); strit != chars.end(); strit++)
    console_char(cdp, *strit);
}