shell fallback for disk_{avail,cap}

Author: scivision

+stdlib/+sys/disk_available.m

@@ -0,0 +1,19 @@
+function t = disk_available(p)
+
+if ispc()
+  dl = extractBefore(stdlib.absolute(p), 2);
+  cmd = "pwsh -c (Get-Volume -DriveLetter " + dl + ").SizeRemaining";
+elseif ismac()
+  cmd = "df -k " + p + " | awk 'NR==2 {print $4*1024}'";
+else
+  cmd = "df -B1 " + p + " | awk 'NR==2 {print $4}'";
+end
+
+[s, t] = system(cmd);
+if s == 0
+  t = strip(t);
+else
+  t = "";
+end
+
+end

+stdlib/+sys/disk_capacity.m

@@ -0,0 +1,19 @@
+function t = disk_capacity(p)
+
+if ispc()
+  dl = extractBefore(stdlib.absolute(p), 2);
+  cmd = "pwsh -c (Get-Volume -DriveLetter " + dl + ").Size";
+elseif ismac()
+  cmd = "df -k " + p + " | awk 'NR==2 {print $2*1024}'";
+else
+  cmd = "df -B1 " + p + " | awk 'NR==2 {print $2}'";
+end
+
+[s, t] = system(cmd);
+if s == 0
+  t = strip(t);
+else
+  t = "";
+end
+
+end

+stdlib/disk_available.m

@@ -21,6 +21,10 @@
   f = stdlib.python.disk_available(d);
 end
 
+if f == 0
+  f = stdlib.sys.disk_available(d);
+end
+
 f = uint64(f);
 
 end

+stdlib/disk_capacity.m

@@ -19,6 +19,10 @@
   f = stdlib.python.disk_capacity(d);
 end
 
+if f == 0
+  f = stdlib.sys.disk_capacity(d);
+end
+
 f = uint64(f);
 
 end

test/TestDisk.m

@@ -13,8 +13,6 @@
 
 function test_disk_available(tc, Ps)
 
-tc.assumeTrue(tc.disk_fun || stdlib.is_mex_fun("stdlib.disk_available"))
-
 zero = uint64(0);
 
 if stdlib.exists(Ps)
@@ -27,8 +25,6 @@ function test_disk_available(tc, Ps)
 
 function test_disk_capacity(tc, Ps)
 
-tc.assumeTrue(tc.disk_fun || stdlib.is_mex_fun("stdlib.disk_capacity"))
-
 zero = uint64(0);
 
 if stdlib.exists(Ps)