Add "-I directories" option.

Add a new form of -I option similar to -o, where the directory list
is taken from the next parameter. This form is more convenient to use
on UN*X command line with tilda expansion.

2 files changed, 12 insertions, 1 deletions

diff --git a/gs/doc/Use.htm b/gs/doc/Use.htm
index 8fce72355..506b6b0d5 100644
--- a/gs/doc/Use.htm
+++ b/gs/doc/Use.htm
@@ -2157,6 +2157,7 @@ named on the command line.
 
 <dl>
 <dt><a name="I_switch"></a><code>-I</code><em>directories</em>
+<br><code>-I </code><em>directories</em>
 <dd>Adds the designated list of directories at the head of the search path
 for library files.
 </dl>
diff --git a/gs/psi/imainarg.c b/gs/psi/imainarg.c
index f7827888e..258594bfb 100644
--- a/gs/psi/imainarg.c
+++ b/gs/psi/imainarg.c
@@ -459,7 +459,17 @@ run_stdin:
             return e_Info;      /* show usage info on exit */
         case 'I':               /* specify search path */
             {
-                char *path = arg_copy(arg, minst->heap);
+                const char *path;
+
+                if (arg[0] == 0) {
+                    path = arg_next(pal, &code);
+                    if (code < 0)
+                        return code;
+                } else
+                    path = arg;
+                if (path == NULL)
+                    return e_Fatal;
+                path = arg_copy(path, minst->heap);
                 if (path == NULL)
                     return e_Fatal;
                 gs_main_add_lib_path(minst, path);