username: functionalize, add tests

Author: scivision

+stdlib/+python/get_username.m

@@ -0,0 +1,10 @@
+function n = get_username()
+
+try
+  n = string(py.os.getlogin());
+catch e
+  warning(e.identifier, "%s", e.message)
+  n = string.empty;
+end
+
+end

+stdlib/+sys/get_username.m

@@ -8,7 +8,7 @@
 [s, n] = system(cmd);
 
 if s == 0
-  n = strtrim(n);  % Remove any trailing newline or spaces
+  n = string(strtrim(n));  % Remove any trailing newline or spaces
 else
   warning("Failed to get username from system command: %s", n);
   n = string.empty;

+stdlib/get_username.m

@@ -2,22 +2,18 @@
 %
 function n = get_username()
 
-n = '';
+n = string.empty;
 
 if stdlib.has_dotnet()
   n = stdlib.dotnet.get_username();
 elseif stdlib.has_java()
   n = stdlib.java.get_username();
+elseif stdlib.has_python()
+  n = stdlib.python.get_username();
 end
 
 if strempty(n)
   n = stdlib.sys.get_username();
 end
 
-try  %#ok<*TRYNC>
-  n = string(n);
 end
-
-end
-
-%!assert(!isempty(get_username()))

test/TestSys.m

@@ -9,6 +9,7 @@
        stdlib.has_java, stdlib.has_python}
 cpu_arch_fun = {@stdlib.cpu_arch, @stdlib.dotnet.cpu_arch, @stdlib.java.cpu_arch}
 host_fun = {@stdlib.hostname, @stdlib.dotnet.get_hostname, @stdlib.java.get_hostname, @stdlib.python.get_hostname}
+user_fun = {@stdlib.get_username, @stdlib.dotnet.get_username, @stdlib.java.get_username, @stdlib.python.get_username}
 ram_free_fun = {@stdlib.ram_free, @stdlib.sys.ram_free, @stdlib.java.ram_free, @stdlib.python.ram_free}
 ram_total_fun = {@stdlib.ram_total, @stdlib.sys.ram_total, @stdlib.dotnet.ram_total @stdlib.java.ram_total}
 end
@@ -91,8 +92,9 @@ function test_hostname(tc, host_fun)
 tc.verifyGreaterThan(strlength(h), 0)
 end
 
-function test_username(tc)
-u = stdlib.get_username();
+function test_username(tc, user_fun)
+is_capable(tc, user_fun)
+u = user_fun();
 tc.verifyGreaterThan(strlength(u), 0)
 end