[OE-core] [PATCH 1/3] package_rpm.bbclass: make DESCRIPTION support newline

[Robert Yang]

The recipe's DESCRIPTION is wrapped automatically by textwrap, make it
support newline ("\n") to let the user can wrap it manually, e.g.:

DESCRIPTION = "Foo1\nFoo2"

In the past, it would be:
Foo1\nFoo2

Now:
Foo1
Foo2

[YOCTO #4348]

Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
---
 meta/classes/package_rpm.bbclass |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/meta/classes/package_rpm.bbclass b/meta/classes/package_rpm.bbclass
index c654cdb..fa928ce 100644
--- a/meta/classes/package_rpm.bbclass
+++ b/meta/classes/package_rpm.bbclass
@@ -534,7 +534,6 @@ def write_rpm_perfiledata(srcname, d):
 
 
 python write_specfile () {
-    import textwrap
     import oe.packagedata
 
     # append information for logs and patches to %prep
@@ -668,6 +667,19 @@ python write_specfile () {
                 deps.append(depends)
         return " ".join(deps)
 
+    def append_description(spec_preamble, text):
+        """
+        Add the description to the spec file.
+        """
+        import textwrap
+        dedent_text = textwrap.dedent(text).strip()
+        # Bitbake saves "\n" as "\\n"
+        if '\\n' in dedent_text:
+            for t in dedent_text.split('\\n'):
+                spec_preamble.append(t.strip())
+        else:
+            spec_preamble.append('%s' % textwrap.fill(dedent_text, width=75))
+
     packages = d.getVar('PACKAGES', True)
     if not packages or packages == '':
         bb.debug(1, "No packages; nothing to do")
@@ -868,8 +880,7 @@ python write_specfile () {
         spec_preamble_bottom.append('')
 
         spec_preamble_bottom.append('%%description -n %s' % splitname)
-        dedent_text = textwrap.dedent(splitdescription).strip()
-        spec_preamble_bottom.append('%s' % textwrap.fill(dedent_text, width=75))
+        append_description(spec_preamble_bottom, splitdescription)
 
         spec_preamble_bottom.append('')
 
@@ -975,8 +986,7 @@ python write_specfile () {
     spec_preamble_top.append('')
 
     spec_preamble_top.append('%description')
-    dedent_text = textwrap.dedent(srcdescription).strip()
-    spec_preamble_top.append('%s' % textwrap.fill(dedent_text, width=75))
+    append_description(spec_preamble_top, srcdescription)
 
     spec_preamble_top.append('')
 
-- 
1.7.10.4