[PATCH v2 1/2] dir: warn about trailing spaces in exclude patterns

[Nguyễn Thái Ngọc Duy]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 dir.c              | 17 +++++++++++++++++
 t/t0008-ignores.sh | 31 +++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/dir.c b/dir.c
index b35b633..6162209 100644
--- a/dir.c
+++ b/dir.c
@@ -491,6 +491,22 @@ void clear_exclude_list(struct exclude_list *el)
        el->filebuf = NULL;
 }
 
+static void check_trailing_spaces(const char *fname, char *buf)
+{
+       int i, last_space = -1, len = strlen(buf);
+       for (i = 0; i < len; i++)
+               if (buf[i] == '\\')
+                       i++;
+               else if (buf[i] == ' ')
+                       last_space = i;
+               else
+                       last_space = -1;
+
+       if (last_space == len - 1)
+               warning(_("%s: trailing spaces in '%s'. Please quote or remove 
them."),
+                       fname, buf);
+}
+
 int add_excludes_from_file_to_list(const char *fname,
                                   const char *base,
                                   int baselen,
@@ -542,6 +558,7 @@ int add_excludes_from_file_to_list(const char *fname,
                if (buf[i] == '\n') {
                        if (entry != buf + i && entry[0] != '#') {
                                buf[i - (i && buf[i-1] == '\r')] = 0;
+                               check_trailing_spaces(fname, entry);
                                add_exclude(entry, base, baselen, el, lineno);
                        }
                        lineno++;
diff --git a/t/t0008-ignores.sh b/t/t0008-ignores.sh
index b4d98e6..9e1d64c 100755
--- a/t/t0008-ignores.sh
+++ b/t/t0008-ignores.sh
@@ -775,4 +775,35 @@ test_expect_success PIPE 'streaming support for --stdin' '
        echo "$response" | grep "^::    two"
 '
 
+############################################################################
+#
+# test whitespace handling
+
+test_expect_success 'trailing whitespace is warned' '
+       mkdir whitespace &&
+       >whitespace/trailing &&
+       >whitespace/untracked &&
+       echo "whitespace/trailing   " >ignore &&
+       cat >expect <<EOF &&
+whitespace/trailing
+whitespace/untracked
+EOF
+       git ls-files -o -X ignore whitespace >actual 2>err &&
+       grep "ignore:.*'\''whitespace/trailing   '\''" err &&
+       test_cmp expect actual
+'
+
+test_expect_success 'quoting allows trailing whitespace' '
+       rm -rf whitespace &&
+       mkdir whitespace &&
+       >"whitespace/trailing  " &&
+       >whitespace/untracked &&
+       echo "whitespace/trailing\\ \\ " >ignore &&
+       echo whitespace/untracked >expect &&
+       : >err.expect &&
+       git ls-files -o -X ignore whitespace >actual 2>err &&
+       test_cmp expect actual &&
+       test_cmp err.expect err
+'
+
 test_done
-- 
1.8.5.2.240.g8478abd

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