file: add support for getting basic directory listings

Not supported on Windows (yet)

Closes #13137

tests/data/Makefile.inc

@@ -261,4 +261,4 @@ test3024 test3025 test3026 test3027 test3028 test3029 test3030 \
 \
 test3100 test3101 test3102 test3103 \
 test3200 \
-test3201 test3202
+test3201 test3202 test3203

tests/data/test1463

@@ -39,6 +39,7 @@ Usage: curl [options...] <url>
 file: FILE protocol options
      --create-file-mode <mode>  File mode for created files
  -I, --head                     Show document info only
+ -l, --list-only                List only mode
  -r, --range <range>            Retrieve only the bytes within RANGE
 </stdout>
 </verify>

tests/data/test1464

@@ -39,6 +39,7 @@ Usage: curl [options...] <url>
 file: FILE protocol options
      --create-file-mode <mode>  File mode for created files
  -I, --head                     Show document info only
+ -l, --list-only                List only mode
  -r, --range <range>            Retrieve only the bytes within RANGE
 </stdout>
 </verify>

tests/data/test3203

@@ -0,0 +1,41 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+FILE
+</keywords>
+</info>
+
+#
+# Client-side
+<client>
+<server>
+file
+</server>
+<name>
+GET a directory using file://
+</name>
+<!-- doesn't work on win32, see #6379 -->
+<features>
+!win32
+</features>
+<command option="no-include">
+file://localhost%FILE_PWD/%LOGDIR/test%TESTNUMBER.dir/
+</command>
+<file name="%LOGDIR/test%TESTNUMBER.dir/dir-listing-test.txt">
+Contents of file are irrelevant
+</file>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<errorcode>
+0
+</errorcode>
+<stdout>
+dir-listing-test.txt
+</stdout>
+</verify>
+</testcase>