add support for wrapping by tab

Author: ryenus

CommandScreen.c

@@ -59,12 +59,15 @@ static int CommandScreen_scanWide(InfoScreen* this, const char* p, size_t total,
       assert(line_offset >= 0 && (size_t)line_offset <= total);
       unsigned char c = (unsigned char)p[i];
       if (c < 0x80) { // skip mbrtowc for ASCII characters
-         if (c == ' ') {
-            last_spc_offset = line_offset;
-            last_spc_cols = line_cols;
-         }
          bytes = width = 1;
          line[line_offset] = c;
+         if (c == ' ' || c == '\t') {
+            bytes = width = (c == '\t' ? 8 - (line_offset % 8) : 1);
+            memset(line + line_offset, ' ', bytes);
+            last_spc_offset = line_offset + (int) bytes - 1;
+            last_spc_cols = line_cols + (int) bytes - 1;
+            i -= bytes - 1;
+         }
       } else {
          wchar_t wc;
          bytes = mbrtowc(&wc, p + i, total - i, &state);
@@ -99,6 +102,9 @@ static int CommandScreen_scanWide(InfoScreen* this, const char* p, size_t total,
       line_offset -= line_size;
       if (line_offset > 0) {
          memcpy(line, p + i - line_offset, line_offset + 1);
+         if (line[0] == '\t') {
+            line[0] = ' '; // ensure we have at least one character
+         }
       }
    }
 
@@ -114,8 +120,8 @@ static void CommandScreen_scan(InfoScreen* this) {
 
    const char* p = Process_getCommand(this->process);
    assert(p != NULL);
-   size_t total = strlen(p);
-   char line[total + 1];
+   size_t total = strlen(p), max = MAXIMUM(total, (size_t)COLS * 2);
+   char line[max + 1];
 
    int line_offset =
 #ifdef HAVE_LIBNCURSESW