Make delete delete many files (#210)

Actually, many *globs*. It additionally prints the glob if no files
matched it, since that's clearer.

Also move the ComputerTestDelegate's filesystem to be disk-based. This
is what actual computers use, and the MemoryMount is a little broken.

src/main/resources/assets/computercraft/lua/rom/programs/delete.lua

@@ -1,16 +1,17 @@
+local args = table.pack(...)
 
-local tArgs = { ... }
-if #tArgs < 1 then
-    print( "Usage: rm <path>" )
+if args.n < 1 then
+    print("Usage: rm <paths>")
     return
 end
 
-local sPath = shell.resolve( tArgs[1] )
-local tFiles = fs.find( sPath )
-if #tFiles > 0 then
-    for n,sFile in ipairs( tFiles ) do
-        fs.delete( sFile )
+for i = 1, args.n do
+    local files = fs.find(shell.resolve(args[i]))
+    if #files > 0 then
+        for n, file in ipairs(files) do
+            fs.delete(file)
+        end
+    else
+        printError(args[i] .. ": No matching files")
     end
-else
-    printError( "No matching files" )
 end

src/main/resources/assets/computercraft/lua/rom/startup.lua

@@ -76,6 +76,9 @@ local function completeEither( shell, nIndex, sText, tPreviousText )
         return fs.complete( sText, shell.dir(), true, true )
     end
 end
+local function completeEitherMany( shell, nIndex, sText, tPreviousText )
+    return fs.complete( sText, shell.dir(), true, true )
+end
 local function completeEitherEither( shell, nIndex, sText, tPreviousText )
     if nIndex == 1 then
         local tResults = fs.complete( sText, shell.dir(), true, true )
@@ -180,7 +183,7 @@ end
 shell.setCompletionFunction( "rom/programs/alias.lua", completeAlias )
 shell.setCompletionFunction( "rom/programs/cd.lua", completeDir )
 shell.setCompletionFunction( "rom/programs/copy.lua", completeEitherEither )
-shell.setCompletionFunction( "rom/programs/delete.lua", completeEither )
+shell.setCompletionFunction( "rom/programs/delete.lua", completeEitherMany )
 shell.setCompletionFunction( "rom/programs/drive.lua", completeDir )
 shell.setCompletionFunction( "rom/programs/edit.lua", completeFile )
 shell.setCompletionFunction( "rom/programs/eject.lua", completePeripheral )

src/test/java/dan200/computercraft/core/ComputerTestDelegate.java

@@ -14,8 +14,8 @@
 import dan200.computercraft.core.computer.BasicEnvironment;
 import dan200.computercraft.core.computer.Computer;
 import dan200.computercraft.core.computer.MainThread;
+import dan200.computercraft.core.filesystem.FileMount;
 import dan200.computercraft.core.filesystem.FileSystemException;
-import dan200.computercraft.core.filesystem.MemoryMount;
 import dan200.computercraft.core.terminal.Terminal;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -25,9 +25,13 @@
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import java.io.File;
+import java.io.IOException;
+import java.io.Writer;
+import java.nio.channels.Channels;
+import java.nio.channels.WritableByteChannel;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
@@ -70,14 +74,25 @@ public class ComputerTestDelegate
     private boolean finished = false;
 
     @BeforeEach
-    public void before()
+    public void before() throws IOException
     {
         ComputerCraft.logPeripheralErrors = true;
         ComputerCraft.log = LogManager.getLogger( ComputerCraft.MOD_ID );
 
         Terminal term = new Terminal( 78, 20 );
-        IWritableMount mount = new MemoryMount()
-            .addFile( "startup.lua", "loadfile('test/mcfly.lua', _ENV)('test/spec') cct_test.finish()" );
+        IWritableMount mount = new FileMount( new File( "test-files/mount" ), Long.MAX_VALUE );
+
+        // Remove any existing files
+        List<String> children = new ArrayList<>();
+        mount.list( "", children );
+        for( String child : children ) mount.delete( child );
+
+        // And add our startup file
+        try( WritableByteChannel channel = mount.openChannelForWrite( "startup.lua" );
+             Writer writer = Channels.newWriter( channel, StandardCharsets.UTF_8.newEncoder(), -1 ) )
+        {
+            writer.write( "loadfile('test/mcfly.lua', _ENV)('test/spec') cct_test.finish()" );
+        }
 
         computer = new Computer( new BasicEnvironment( mount ), term, 0 );
         computer.addApi( new ILuaAPI()

src/test/java/dan200/computercraft/core/filesystem/MemoryMount.java

@@ -120,7 +120,7 @@ public void list( @Nonnull String path, @Nonnull List<String> files )
     {
         for( String file : this.files.keySet() )
         {
-            if( file.startsWith( path ) ) files.add( file );
+            if( file.startsWith( path ) ) files.add( file.substring( path.length() + 1 ) );
         }
     }
 

src/test/resources/test-rom/spec/programs/delete_spec.lua

@@ -0,0 +1,35 @@
+describe("The rm program", function()
+    local function touch(file)
+        io.open(file, "w"):close()
+    end
+
+    it("deletes one file", function()
+        touch("/test-files/a.txt")
+
+        shell.run("rm /test-files/a.txt")
+
+        expect(fs.exists("/test-files/a.txt")):eq(false)
+    end)
+
+    it("deletes many files", function()
+        touch("/test-files/a.txt")
+        touch("/test-files/b.txt")
+        touch("/test-files/c.txt")
+
+        shell.run("rm /test-files/a.txt /test-files/b.txt")
+
+        expect(fs.exists("/test-files/a.txt")):eq(false)
+        expect(fs.exists("/test-files/b.txt")):eq(false)
+        expect(fs.exists("/test-files/c.txt")):eq(true)
+    end)
+
+    it("deletes a glob", function()
+        touch("/test-files/a.txt")
+        touch("/test-files/b.txt")
+
+        shell.run("rm /test-files/*.txt")
+
+        expect(fs.exists("/test-files/a.txt")):eq(false)
+        expect(fs.exists("/test-files/b.txt")):eq(false)
+    end)
+end)