lib/util/display.c

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#include "../../include/ascii-chat/util/display.h"
#include "../../include/ascii-chat/util/utf8.h"
#include "../../include/ascii-chat/video/ansi.h"
#include "../../include/ascii-chat/common.h"
#include <stdlib.h>
#include <string.h>
 
int display_width(const char *text) {
  if (!text) {
    return 0;
  }
 
  // Strip ANSI escape codes
  char *stripped = ansi_strip_escapes(text, strlen(text));
 
  // Use stripped version if available, otherwise use original text
  const char *to_measure = stripped ? stripped : text;
 
  // Calculate display width using UTF-8 aware calculation
  int width = utf8_display_width(to_measure);
  SAFE_FREE(stripped);
 
  // Return 0 for empty or invalid input, otherwise return calculated width
  return width < 0 ? 0 : width;
}
 
int display_center_horizontal(const char *text, int terminal_width) {
  if (!text || terminal_width <= 0) {
    return 0;
  }
 
  int text_width = display_width(text);
 
  // If text is empty or wider than terminal, don't add padding
  if (text_width == 0 || text_width >= terminal_width) {
    return 0;
  }
 
  // Calculate left padding to center
  return (terminal_width - text_width) / 2;
}
 
int display_center_vertical(int content_height, int terminal_height) {
  if (content_height <= 0 || terminal_height <= 0) {
    return 0;
  }
 
  if (content_height >= terminal_height) {
    return 0;
  }
 
  return (terminal_height - content_height) / 2;
}