Merge branch 'es/blame-L-breakage'

The refactoring made for parsing "-L" option recently to support
"git log -L" seems to have broken "git blame -L X,-5" to show 5
lines leading to X.

* es/blame-L-breakage:
  blame-options.txt: explain that -L <start> and <end> are optional
  blame-options.txt: place each -L option variation on its own line
  t8001/t8002 (blame): add blame -L :funcname tests
  t8001/t8002 (blame): add blame -L tests
  t8001/t8002 (blame): modernize style
  line-range: fix "blame -L X,-N" regression

Documentation/blame-options.txt

@@ -9,9 +9,13 @@
 --show-stats::
 	Include additional statistics at the end of blame output.
 
--L <start>,<end>, -L :<regex>::
-	Annotate only the given line range.  <start> and <end> can take
-	one of these forms:
+-L <start>,<end>::
+-L :<regex>::
+	Annotate only the given line range.  <start> and <end> are optional.
+	``-L <start>'' or ``-L <start>,'' spans from <start> to end of file.
+	``-L ,<end>'' spans from start of file to <end>.
++
+<start> and <end> can take one of these forms:
 
 include::line-range-format.txt[]
 

line-range.c

@@ -211,6 +211,8 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
 		    void *cb_data, long lines, long *begin, long *end,
 		    const char *path)
 {
+	*begin = *end = 0;
+
 	if (*arg == ':') {
 		arg = parse_range_funcname(arg, nth_line_cb, cb_data, lines, begin, end, path);
 		if (!arg || *arg)
@@ -226,6 +228,11 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
 	if (*arg)
 		return -1;
 
+	if (*begin && *end && *end < *begin) {
+		long tmp;
+		tmp = *end; *end = *begin; *begin = tmp;
+	}
+
 	return 0;
 }