[m-rev.] diff: fix bug #29: mdb listing

[Zoltan Somogyi]

Creating a test case for this would be difficult, since it would require
changing the way we build executables for testing. If anyone wants a test case,
build it yourself. I don't think one is necessary in this case.

Zoltan

Fix a bug reported by Peter Ross, #29 in Mantis. The bug was an abort by mdb
if it was asked to list the contents of a source file and that source file was
known as an absolute path name

browser/listing.m:
	Check whether the filename is absolute, and if it is, don't try pasting
	directories from the search path before it.

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Index: browser/listing.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/browser/listing.m,v
retrieving revision 1.10
diff -u -b -r1.10 listing.m
--- browser/listing.m	1 Dec 2006 15:03:44 -0000	1.10
+++ browser/listing.m	16 Nov 2007 01:08:41 -0000
@@ -143,6 +143,23 @@
 
 list_file(OutStrm, ErrStrm, FileName, FirstLine, LastLine, MarkLine, Path,
         !IO) :-
+    ( dir.path_name_is_absolute(FileName) ->
+        io.open_input(FileName, Result0, !IO),
+        (
+            Result0 = ok(InStream),
+            InStrm = mercury_stream_to_c_FILE_star(InStream),
+            print_lines_in_range(InStrm, OutStrm, 1, FirstLine, LastLine,
+                MarkLine, !IO)
+        ;
+            Result0 = error(Error),
+            ErrorMsg = io.error_message(Error),
+            write_to_c_file(ErrStrm, "mdb: cannot open file ", !IO),
+            write_to_c_file(ErrStrm, FileName, !IO),
+            write_to_c_file(ErrStrm, ": ", !IO),
+            write_to_c_file(ErrStrm, ErrorMsg, !IO),
+            write_to_c_file(ErrStrm, "\n", !IO)
+        )
+    ;
     find_and_open_file([dir.this_directory | Path], FileName, Result, !IO),
     (
         Result = yes(InStrm),
@@ -153,6 +170,7 @@
         write_to_c_file(ErrStrm, "mdb: cannot find file ", !IO),
         write_to_c_file(ErrStrm, FileName, !IO),
         write_to_c_file(ErrStrm, "\n", !IO)
+        )
     ).
 
 :- pred write_to_c_file(c_file_ptr::in, string::in, io::di, io::uo) is det.
@@ -175,7 +193,6 @@
     maybe(c_file_ptr)::out, io::di, io::uo) is det.
 
 find_and_open_file([], _, no, !IO).
-
 find_and_open_file([Dir | Path], FileName, Result, !IO) :-
     io.open_input(Dir / FileName, Result0, !IO),
     (
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