subprocess_run: add echo= option

Author: scivision

+stdlib/subprocess_run.m

@@ -33,6 +33,7 @@
   opt.stdin {mustBeTextScalar} = ''
   opt.stdout (1,1) logical = true
   opt.stderr (1,1) logical = true
+  opt.echo (1,1) logical = false
 end
 
 
@@ -85,6 +86,10 @@
 inold = getenv("GFORTRAN_STDIN_UNIT");
 setenv("GFORTRAN_STDIN_UNIT", "5");
 
+if opt.echo
+  disp(cmd)
+end
+
 [status, msg] = system(join(cmd), env_pairs{:});
 
 setenv("GFORTRAN_STDOUT_UNIT", outold);

test/TestSubprocess.m

@@ -50,13 +50,13 @@ function test_cwd(tc)
   c = 'ls -l';
 end
 
-[s, m] = stdlib.subprocess_run(c);
+[s, m] = stdlib.subprocess_run(c, echo=true);
 tc.assertEqual(s, 0, "status non-zero")
 tc.verifyGreaterThan(strlength(m), 0, "empty directory not expected")
 
 td = tc.createTemporaryFolder();
 
-[s, mc] = stdlib.subprocess_run(c, cwd=td);
+[s, mc] = stdlib.subprocess_run(c, cwd=td, echo=true);
 tc.assertEqual(s, 0, "status non-zero")
 tc.verifyNotEqual(m, mc, "expected different directory to have different contents")