[doc.sections] recognize diff sections

NEWS.md

@@ -108,6 +108,12 @@ Features:
 * Added the `config file-options` management command that
   can be used to examine the options that will be applied
   to a given file.
+* When viewing a diff, the sections of the diff for each
+  file is recognized and shown in the breadcrumb bar.  So,
+  you can see the file the focused line is in.  You can
+  also jump to a particular file by focusing on the
+  breadcrumb bar, selecting the crumb, and then selecting
+  the desired file.
 
 Bug Fixes:
 * Binary data piped into stdin should now be treated the same

src/Makefile.am

@@ -87,7 +87,7 @@ time_fmts.cc: ptimec$(BUILD_EXEEXT)
 
 if HAVE_RE2C
 %.cc: %.re
-	$(RE2C_V)$(RE2C_CMD) --bit-vectors -W --tags -8 -o $@ $<
+	$(RE2C_V)$(RE2C_CMD) --bit-vectors -W -8 -o $@ $<
 	$(REC2_V)test $@ -ef $(srcdir)/$*.cc || cp $@ $(srcdir)/$*.cc
 endif
 

src/data_scanner.cc

@@ -206,6 +206,12 @@ static struct {
     {
         "zwsp",
     },
+    {
+        "dffi",
+    },
+    {
+        "dfch",
+    },
 };
 
 const char* DNT_NAMES[DNT_MAX - DNT_KEY] = {

src/data_scanner.hh

@@ -102,9 +102,12 @@ enum data_token_t {
     DT_GARBAGE,
     DT_ZERO_WIDTH_SPACE,
 
-    DT_TERMINAL_MAX = DT_ZERO_WIDTH_SPACE + 1,
+    DT_DIFF_FILE_HEADER,
+    DT_DIFF_HUNK_HEADING,
 
-    DNT_KEY = 50,
+    DT_TERMINAL_MAX = DT_DIFF_HUNK_HEADING + 1,
+
+    DNT_KEY = 52,
     DNT_PAIR,
     DNT_VALUE,
     DNT_ROW,