gdb/guile: perform tilde expansion when sourcing guile scripts

Before this patch:

  (gdb) source ~/script.scm
  ERROR: In procedure apply-smob/1:
  ERROR: In procedure primitive-load-path: Unable to find file "~/script.scm" in load path
  Error while executing Scheme code.
  (gdb)

This is because the path is not tilde expanded.  In contrast, when
sourcing a .py or .gdb script the path is tilde expanded.

This commit fixes this oversight, and allows the above source command
to work as expected.

The tilde expansion is done in the generic GDB code before we call the
sourcer function for any particular extension language.

gdb/ChangeLog:

	* cli/cli-cmds.c: Add 'gdbsupport/gdb_tilde_expand.h'
	include.
	(source_script_with_search): Perform tilde expansion.

gdb/testsuite/ChangeLog:

	* gdb.guile/guile.exp: Add an extra test.

4 files changed, 28 insertions, 2 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 25ee791..41fe042 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2021-05-07  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* cli/cli-cmds.c: Add 'gdbsupport/gdb_tilde_expand.h'
+	include.
+	(source_script_with_search): Perform tilde expansion.
+
 2021-05-07  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* target-descriptions.c (struct target_desc_info) <filename>:
diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index 68ef92e..62948f5 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -54,6 +54,7 @@
 
 #include "extension.h"
 #include "gdbsupport/pathstuff.h"
+#include "gdbsupport/gdb_tilde_expand.h"
 
 #ifdef TUI
 #include "tui/tui.h"	/* For tui_active et.al.  */
@@ -737,8 +738,16 @@ source_script_with_search (const char *file, int from_tty, int search_path)
      anyway so that error messages show the actual file used.  But only do
      this if we (may have) used search_path, as printing the full path in
      errors for the non-search case can be more noise than signal.  */
-  source_script_from_stream (opened->stream.get (), file,
-			     search_path ? opened->full_path.get () : file);
+  const char *file_to_open;
+  gdb::unique_xmalloc_ptr<char> tilde_expanded_file;
+  if (search_path)
+    file_to_open = opened->full_path.get ();
+  else
+    {
+      tilde_expanded_file = gdb_tilde_expand_up (file);
+      file_to_open = tilde_expanded_file.get ();
+    }
+  source_script_from_stream (opened->stream.get (), file, file_to_open);
 }
 
 /* Wrapper around source_script_with_search to export it to main.c
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 2fac86e..afdd887 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,9 @@
 2021-05-07  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* gdb.guile/guile.exp: Add an extra test.
+
+2021-05-07  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* gdb.base/ptype-offsets.exp: Replace use of send_gdb with
 	gdb_test_no_output.
 
diff --git a/gdb/testsuite/gdb.guile/guile.exp b/gdb/testsuite/gdb.guile/guile.exp
index 6e464cc..0fb8228 100644
--- a/gdb/testsuite/gdb.guile/guile.exp
+++ b/gdb/testsuite/gdb.guile/guile.exp
@@ -82,3 +82,10 @@ gdb_test_no_output "guile (define a (execute \"help\" #:to-string #t))" \
 
 gdb_test "guile (print a)" "= .*aliases -- User-defined aliases of other commands.*" \
     "verify help to uiout"
+
+# Verify that we can source a guile script using ~ for the HOME directory.
+save_vars { env(HOME) } {
+    set env(HOME) $srcdir/$subdir
+    clean_restart
+    gdb_test "source ~/source2.scm" "yes"
+}