add is_removable()

Author: scivision

+stdlib/is_removable.m

@@ -0,0 +1,30 @@
+function y  = is_removable(filepath)
+
+y = false;
+
+if ispc()
+  drive = stdlib.root_name(filepath);
+  cmd = ['wmic logicaldisk where "DeviceID=''', drive, '''" get DriveType'];
+  [s, m] = system(cmd);
+  if s == 0
+    y = strtrim(extractAfter(m, "DriveType")) == "2";
+  end
+elseif ismac()
+  cmd1 = ['df ', filepath, ' | tail -n 1 | awk ''{print $1}'''];
+  [s1, m1] = system(cmd1);
+  if s1 == 0
+    cmd2 = ['diskutil info ', m1];
+    [s2, m2] = system(cmd2);
+    y = s2 == 0 && contains(m2, "Removable Media:" + whitespacePattern + "Removable");
+  end
+else
+  cmd1 = ['df ', filepath, ' | tail -n 1 | awk ''{print $1}'''];
+  [s1, m1] = system(cmd1);
+  if s1 == 0
+    f1 = ['/sys/class/block/', m1, '/removable'];
+    t1 = fileread(f1);
+    y = strtrim(t1) == "1";
+  end
+end
+
+end

test/TestDisk.m

@@ -42,6 +42,14 @@ function test_disk_ac(tc, Ps, disk_ac_fun, disk_ac_name)
 end
 
 
+function test_is_removable(tc)
+
+y = stdlib.is_removable(pwd());
+tc.verifyClass(y, 'logical')
+
+end
+
+
 function test_hard_link_count(tc, hl_fun)
 fname = "hard_link_count";
 n = "stdlib." + hl_fun + "." + fname;