Cygwin: Add '--names-only' flag to cygcheck

Add '--names-only' flag to cygcheck, to output just the bare package
names.

(cherry picked from commit 127166f707)

winsup/doc/utils.xml

@@ -118,6 +118,7 @@
 	  <command>cygcheck</command>
 	  <arg choice="plain">-c</arg>
 	  <arg>-d</arg>
+	  <arg>-n</arg>
 	  <arg><replaceable>PACKAGE</replaceable></arg>
 	</cmdsynopsis>
 	<cmdsynopsis>
@@ -166,7 +167,8 @@ At least one command option or a PROGRAM is required, as shown above.
   PROGRAM              list library (DLL) dependencies of PROGRAM
   -c, --check-setup    show installed version of PACKAGE and verify integrity
                        (or for all installed packages if none specified)
-  -d, --dump-only      just list packages, do not verify (with -c)
+  -d, --dump-only      do not verify packages (with -c)
+  -n, --names-only     just list package names (implies -c -d)
   -s, --sysinfo        produce diagnostic system information (implies -c -d)
   -r, --registry       also scan registry for Cygwin settings (with -s)
   -k, --keycheck       perform a keyboard check session (must be run from a
@@ -196,7 +198,7 @@ Note: -c, -f, and -l only report on packages that are currently installed. To
       dealing with Cygwin programs. If you are familiar with
       <command>dpkg</command> or <command>rpm</command>,
       <command>cygcheck</command> is similar in many ways. (The major
-      difference is that <command>setup.exe</command> handles installing and
+      difference is that <command>setup</command> handles installing and
       uninstalling packages; see <xref linkend="internet-setup"/> for more
       information.) </para>
     <para> The <literal>-c</literal> option checks the version and status of
@@ -205,11 +207,12 @@ Note: -c, -f, and -l only report on packages that are currently installed. To
       with no arguments it lists all packages. A package will be marked
       <literal>Incomplete</literal> if files originally installed are no longer
       present. The best thing to do in that situation is reinstall the package
-      with <command>setup.exe</command>. To see which files are missing, use
+      with <command>setup</command>. To see which files are missing, use
       the <literal>-v</literal> option. If you do not need to know the status
       of each package and want <command>cygcheck</command> to run faster, add
       the <literal>-d</literal> option and <command>cygcheck</command> will
-      only output the name and version for each package. </para>
+      only output the name and version for each package. Add the
+      <literal>-n</literal> option to output only the names of packages. </para>
     <para> If you list one or more programs on the command line,
       <command>cygcheck</command> will diagnose the runtime environment of that
       program or programs, providing the names of DLL files on which the

winsup/utils/mingw/cygcheck.cc

@@ -42,6 +42,7 @@ int givehelp = 0;
 int keycheck = 0;
 int check_setup = 0;
 int dump_only = 0;
+int names_only = 0;
 int find_package = 0;
 int list_package = 0;
 int grep_packages = 0;
@@ -56,7 +57,7 @@ typedef __int64 longlong;
 #endif
 
 /* In dump_setup.cc  */
-void dump_setup (int, char **, bool);
+void dump_setup (int, char **, bool, bool);
 void package_find (int, char **);
 void package_list (int, char **);
 /* In bloda.cc  */
@@ -2113,7 +2114,8 @@ At least one command option or a PROGRAM is required, as shown above.\n\
   PROGRAM              list library (DLL) dependencies of PROGRAM\n\
   -c, --check-setup    show installed version of PACKAGE and verify integrity\n\
 		       (or for all installed packages if none specified)\n\
-  -d, --dump-only      just list packages, do not verify (with -c)\n\
+  -d, --dump-only      do not verify packages (with -c)\n\
+  -n, --names-only     just list package names (implies -c -d)\n\
   -s, --sysinfo        produce diagnostic system information (implies -c)\n\
   -r, --registry       also scan registry for Cygwin settings (with -s)\n\
   -k, --keycheck       perform a keyboard check session (must be run from a\n\
@@ -2141,6 +2143,7 @@ Note: -c, -f, and -l only report on packages that are currently installed. To\n\
 struct option longopts[] = {
   {"check-setup", no_argument, NULL, 'c'},
   {"dump-only", no_argument, NULL, 'd'},
+  {"names-only", no_argument, NULL, 'n'},
   {"sysinfo", no_argument, NULL, 's'},
   {"registry", no_argument, NULL, 'r'},
   {"verbose", no_argument, NULL, 'v'},
@@ -2154,7 +2157,7 @@ struct option longopts[] = {
   {0, no_argument, NULL, 0}
 };
 
-static char opts[] = "cdsrvkflphV";
+static char opts[] = "cdnsrvkflphV";
 
 static void
 print_version ()
@@ -2266,6 +2269,11 @@ main (int argc, char **argv)
       case 'd':
 	dump_only = 1;
 	break;
+      case 'n':
+	check_setup = 1;
+	dump_only = 1;
+	names_only = 1;
+	break;
       case 'r':
 	registry = 1;
 	break;
@@ -2348,7 +2356,7 @@ main (int argc, char **argv)
     }
 
   if (check_setup)
-    dump_setup (verbose, argv, !dump_only);
+    dump_setup (verbose, argv, !dump_only, names_only);
   else if (find_package)
     package_find (verbose, argv);
   else if (list_package)
@@ -2367,7 +2375,7 @@ main (int argc, char **argv)
       if (!check_setup)
 	{
 	  puts ("");
-	  dump_setup (verbose, NULL, !dump_only);
+	  dump_setup (verbose, NULL, !dump_only, FALSE);
 	}
 
       if (!givehelp)

winsup/utils/mingw/dump_setup.cc

@@ -468,11 +468,13 @@ get_packages (char **argv)
 }
 
 void
-dump_setup (int verbose, char **argv, bool check_files)
+dump_setup (int verbose, char **argv, bool check_files, bool names_only)
 {
   pkgver *packages = get_packages(argv);
 
-  puts ("Cygwin Package Information");
+  if (!names_only)
+    puts ("Cygwin Package Information");
+
   if (packages == NULL)
     {
       puts ("No setup information found");
@@ -486,12 +488,15 @@ dump_setup (int verbose, char **argv, bool check_files)
 	puts ("");
     }
 
-  printf ("%-*s %-*s%s\n", package_len, "Package",
-			   check_files ? version_len : 7, "Version",
-			   check_files ? "     Status" : "");
+  if (!names_only)
+    printf ("%-*s %-*s%s\n", package_len, "Package",
+	    check_files ? version_len : 7, "Version",
+	    check_files ? "	Status" : "");
   for (int i = 0; packages[i].name; i++)
     {
-      if (check_files)
+      if (names_only)
+	printf ("%s\n", packages[i].name);
+      else if (check_files)
 	printf ("%-*s %-*s%s\n", package_len, packages[i].name,
 		version_len, packages[i].ver,
 		check_package_files (verbose, packages[i].name)