gcc-changelog: handle entries with multi-line file lists

This extends the ChangeLog entries parsing machinery to handle entries
that cover multiple files spanning over multiple lines. For instance:

    * first_file_patched.c, second_file_patched.c, third_file_patched.c,
    fourth_file_patched.c: Do things.

contrib/

	* gcc-changelog/git_commit.py (ChangeLogEntry): Handle entries
	with multi-line file lists.
	* gcc-changelog/test_email.py: New testcase.
	* gcc-changelog/test_patches.txt: Likewise.

contrib/gcc-changelog/git_commit.py

@@ -185,14 +185,32 @@ class ChangeLogEntry:
     @property
     def files(self):
         files = []
+
+        # Whether the content currently processed is between a star prefix the
+        # end of the file list: a colon or an open paren.
+        in_location = False
+
         for line in self.lines:
+            # If this line matches the star prefix, start the location
+            # processing on the information that follows the star.
             m = star_prefix_regex.match(line)
             if m:
+                in_location = True
                 line = m.group('content')
+
+            if in_location:
+                # Strip everything that is not a filename in "line": entities
+                # "(NAME)", entry text (the colon, if present, and anything
+                # that follows it).
                 if '(' in line:
                     line = line[:line.index('(')]
+                    in_location = False
                 if ':' in line:
                     line = line[:line.index(':')]
+                    in_location = False
+
+                # At this point, all that 's left is a list of filenames
+                # separated by commas and whitespaces.
                 for file in line.split(','):
                     file = file.strip()
                     if file:

contrib/gcc-changelog/test_email.py

@@ -286,3 +286,12 @@ class TestGccChangelog(unittest.TestCase):
         email = self.from_patch_glob('0001-Update-merge.sh-to-reflect.patch')
         assert (email.changelog_entries[0].lines[0]
                 == '\t* LOCAL_PATCHES: Use git hash instead of SVN id.')
+
+    def test_multiline_file_list(self):
+        email = self.from_patch_glob(
+            '0001-Ada-Reuse-Is_Package_Or_Generic_Package-where-possib.patch')
+        assert (email.changelog_entries[0].files
+                == ['contracts.adb', 'einfo.adb', 'exp_ch9.adb',
+                    'sem_ch12.adb', 'sem_ch4.adb', 'sem_ch7.adb',
+                    'sem_ch8.adb', 'sem_elab.adb', 'sem_type.adb',
+                    'sem_util.adb'])

contrib/gcc-changelog/test_patches.txt

@@ -2650,4 +2650,94 @@ index dfa7bf3d196..3f4f1629a22 100755
  
 -- 
 2.26.2
+=== 0001-Ada-Reuse-Is_Package_Or_Generic_Package-where-possib.patch ===
+From 557b268fffffdeb0980a17411f458eee333f55c6 Mon Sep 17 00:00:00 2001
+From: Piotr Trojanek <trojanek@adacore.com>
+Date: Thu, 12 Dec 2019 11:45:24 +0100
+Subject: [PATCH] [Ada] Reuse Is_Package_Or_Generic_Package where possible
+
+2020-05-26  Piotr Trojanek  <trojanek@adacore.com>
+
+gcc/ada/
+
+	* contracts.adb, einfo.adb, exp_ch9.adb, sem_ch12.adb,
+	sem_ch4.adb, sem_ch7.adb, sem_ch8.adb, sem_elab.adb,
+	sem_type.adb, sem_util.adb: Reuse Is_Package_Or_Generic_Package
+	where possible (similarly, reuse Is_Concurrent_Type if it was
+	possible in the same expressions).
+---
+ gcc/ada/contracts.adb |  2 +-
+ gcc/ada/einfo.adb     | 22 +++++++++++-----------
+ gcc/ada/exp_ch9.adb   |  2 +-
+ gcc/ada/sem_ch12.adb  |  2 +-
+ gcc/ada/sem_ch4.adb   |  2 +-
+ gcc/ada/sem_ch7.adb   |  6 +++---
+ gcc/ada/sem_ch8.adb   |  6 +++---
+ gcc/ada/sem_elab.adb  |  2 +-
+ gcc/ada/sem_type.adb  |  2 +-
+ gcc/ada/sem_util.adb  |  6 +++---
+ 10 files changed, 26 insertions(+), 26 deletions(-)
+
+diff --git a/gcc/ada/contracts.adb b/gcc/ada/contracts.adb
+index 981bb91..d58f136 100644
+--- a/gcc/ada/contracts.adb
++++ b/gcc/ada/contracts.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/einfo.adb b/gcc/ada/einfo.adb
+index 98b508f..1df8ed0 100644
+--- a/gcc/ada/einfo.adb
++++ b/gcc/ada/einfo.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/exp_ch9.adb b/gcc/ada/exp_ch9.adb
+index 64ac353..392a221 100644
+--- a/gcc/ada/exp_ch9.adb
++++ b/gcc/ada/exp_ch9.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_ch12.adb b/gcc/ada/sem_ch12.adb
+index dc3a3c2..209e060 100644
+--- a/gcc/ada/sem_ch12.adb
++++ b/gcc/ada/sem_ch12.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
+index 5910112..702f265 100644
+--- a/gcc/ada/sem_ch4.adb
++++ b/gcc/ada/sem_ch4.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_ch7.adb b/gcc/ada/sem_ch7.adb
+index 6d9a1db..f217dfd 100644
+--- a/gcc/ada/sem_ch7.adb
++++ b/gcc/ada/sem_ch7.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_ch8.adb b/gcc/ada/sem_ch8.adb
+index f083f7c..7f50b40 100644
+--- a/gcc/ada/sem_ch8.adb
++++ b/gcc/ada/sem_ch8.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_elab.adb b/gcc/ada/sem_elab.adb
+index f3cac46..dbf3fac 100644
+--- a/gcc/ada/sem_elab.adb
++++ b/gcc/ada/sem_elab.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_type.adb b/gcc/ada/sem_type.adb
+index e5d01dd..1868568 100644
+--- a/gcc/ada/sem_type.adb
++++ b/gcc/ada/sem_type.adb
+@@ -0,0 +1 @@
++
+diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
+index b980b4c..c1b1d9e 100644
+--- a/gcc/ada/sem_util.adb
++++ b/gcc/ada/sem_util.adb
+@@ -0,0 +1 @@
++
+-- 
+2.1.4