Turn 8 spaces to tab across the project

According to the current code style of the project

src/hb-coretext.cc

diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index 31aa00a..8c9b49c 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -111,7 +111,7 @@
 release_data (void *info, const void *data, size_t size)
 {
   assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
-          hb_blob_get_data ((hb_blob_t *) info, nullptr) == data);
+	  hb_blob_get_data ((hb_blob_t *) info, nullptr) == data);
 
   hb_blob_destroy ((hb_blob_t *) info);
 }
@@ -233,21 +233,21 @@
       atsFont = CTFontGetPlatformFont (new_ct_font, NULL);
       status = ATSFontGetFileReference (atsFont, &fsref);
       if (status == noErr)
-        new_url = CFURLCreateFromFSRef (NULL, &fsref);
+	new_url = CFURLCreateFromFSRef (NULL, &fsref);
 #else
       new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute);
 #endif
       // Keep reconfigured font if URL cannot be retrieved (seems to be the case
       // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606
       if (!original_url || !new_url || CFEqual (original_url, new_url)) {
-        CFRelease (ct_font);
-        ct_font = new_ct_font;
+	CFRelease (ct_font);
+	ct_font = new_ct_font;
       } else {
-        CFRelease (new_ct_font);
-        DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed.");
+	CFRelease (new_ct_font);
+	DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed.");
       }
       if (new_url)
-        CFRelease (new_url);
+	CFRelease (new_url);
     }
     else
       DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed");
@@ -433,9 +433,9 @@
 hb_bool_t
 _hb_coretext_shape (hb_shape_plan_t    *shape_plan,
 		    hb_font_t          *font,
-                    hb_buffer_t        *buffer,
-                    const hb_feature_t *features,
-                    unsigned int        num_features)
+		    hb_buffer_t        *buffer,
+		    const hb_feature_t *features,
+		    unsigned int        num_features)
 {
   hb_face_t *face = font->face;
   CGFontRef cg_font = (CGFontRef) (const void *) face->data.coretext;
@@ -477,7 +477,7 @@
     {
       const hb_aat_feature_mapping_t * mapping = hb_aat_layout_find_feature_mapping (features[i].tag);
       if (!mapping)
-        continue;
+	continue;
 
       active_feature_t feature;
       feature.rec.feature = mapping->aatFeatureType;
@@ -519,7 +519,7 @@
 
       if (event->index != last_index)
       {
-        /* Save a snapshot of active features and the range. */
+	/* Save a snapshot of active features and the range. */
 	range_record_t *range = range_records.push ();
 
 	if (active_features.length)
@@ -580,9 +580,9 @@
 
       if (event->start)
       {
-        active_features.push (event->feature);
+	active_features.push (event->feature);
       } else {
-        active_feature_t *feature = active_features.find (&event->feature);
+	active_feature_t *feature = active_features.find (&event->feature);
 	if (feature)
 	  active_features.remove (feature - active_features.arrayZ);
       }
@@ -700,15 +700,15 @@
 #if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1090
 #  define kCTLanguageAttributeName CFSTR ("NSLanguage")
 #endif
-        CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
+	CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
 							    hb_language_to_string (buffer->props.language),
 							    kCFStringEncodingUTF8,
 							    kCFAllocatorNull);
 	if (unlikely (!lang))
-        {
+	{
 	  CFRelease (attr_string);
 	  FAIL ("CFStringCreateWithCStringNoCopy failed");
-        }
+	}
 	CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
 					kCTLanguageAttributeName, lang);
 	CFRelease (lang);
@@ -757,7 +757,7 @@
 	      feature.start < chars_len && feature.start < feature.end)
 	  {
 	    CFRange feature_range = CFRangeMake (feature.start,
-	                                         hb_min (feature.end, chars_len) - feature.start);
+						 hb_min (feature.end, chars_len) - feature.start);
 	    if (feature.value)
 	      CFAttributedStringRemoveAttribute (attr_string, feature_range, kCTKernAttributeName);
 	    else
@@ -781,8 +781,8 @@
       CFRelease (level_number);
       if (unlikely (!options))
       {
-        CFRelease (attr_string);
-        FAIL ("CFDictionaryCreate failed");
+	CFRelease (attr_string);
+	FAIL ("CFDictionaryCreate failed");
       }
 
       CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);
@@ -893,7 +893,7 @@
 	if (!matched)
 	{
 	  CFRange range = CTRunGetStringRange (run);
-          DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
+	  DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
 		     range.location, range.location + range.length);
 	  if (!buffer->ensure_inplace (buffer->len + range.length))
 	    goto resize_and_retry;
@@ -921,7 +921,7 @@
 		  continue;
 	      }
 	      if (buffer->unicode->is_default_ignorable (ch))
-	        continue;
+		continue;
 
 	      info->codepoint = notdef;
 	      info->cluster = log_clusters[j];
@@ -966,7 +966,7 @@
   scratch = scratch_saved
 
       { /* Setup glyphs */
-        SCRATCH_SAVE();
+	SCRATCH_SAVE();
 	const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : nullptr;
 	if (!glyphs) {
 	  ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
@@ -989,12 +989,12 @@
 	SCRATCH_RESTORE();
       }
       {
-        /* Setup positions.
+	/* Setup positions.
 	 * Note that CoreText does not return advances for glyphs.  As such,
 	 * for all but last glyph, we use the delta position to next glyph as
 	 * advance (in the advance direction only), and for last glyph we set
 	 * whatever is needed to make the whole run's advance add up. */
-        SCRATCH_SAVE();
+	SCRATCH_SAVE();
 	const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : nullptr;
 	if (!positions) {
 	  ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);