dummix dumbshell: fixed erratic 'cd' behaviours

Former-commit-id: 82698355d2566d579d2461bc1f1b7a4799f60163
Former-commit-id: 033a2a4f690b8e968e7626c46b998e3bba91031a

src/net/torvald/terrarum/StateVTTest.kt

@@ -21,8 +21,8 @@ class StateVTTest : BasicGameState() {
 
     // HiRes: 100x64, LoRes: 80x25
     val computerInside = BaseTerrarumComputer(8)
-    val vt = SimpleTextTerminal(SimpleTextTerminal.AMETHYST_NOVELTY, 100, 64,
-            computerInside, colour = true, hires = true)
+    val vt = SimpleTextTerminal(SimpleTextTerminal.AMETHYST_NOVELTY, 80, 25,
+            computerInside, colour = true, hires = false)
 
 
     val vtUI = Image(vt.displayW, vt.displayH)

src/net/torvald/terrarum/virtualcomputer/assets/loots/dummix/bin/dsh.lua

@@ -40,6 +40,10 @@ local function printErr(msg)
     print(DLE..msg)
 end
 
+local function shallowCopy(t)
+    return {table.unpack(t)}
+end
+
 -- BUILTINS -------------------------------------------------------------------
 
 local function cd(tArgs)
@@ -47,14 +51,7 @@ local function cd(tArgs)
 
     if (dir == nil or #dir < 1) then return end
 
-    -- check if the directory exists
-
-    local chkdir = expandPath(dir)
-
-    if not fs.exists(chkdir) then
-        os.errorNoSuchFileOrDir("cd: "..dir)
-        return
-    end
+    local oldWorkingDir = shallowCopy(os.workingDir)
 
     -- parse dir by delimeter '/'
     if (dir:byte(1) == 47) then -- if dir begins with '/'
@@ -69,6 +66,8 @@ local function cd(tArgs)
         if (word == "..") then
             if (#os.workingDir > 1) then
                 os.workingDir[#os.workingDir] = nil -- pops an element to oblivion
+            else
+                -- pass
             end
         elseif (word == ".") then
             -- pass
@@ -76,6 +75,14 @@ local function cd(tArgs)
             table.insert(os.workingDir, word)
         end
     end
+
+
+    -- check if the directory exists
+    if not fs.isDir(os.fullWorkPath()) then
+        os.errorNoSuchFileOrDir("cd: "..dir)
+        os.workingDir = oldWorkingDir
+        return
+    end
 end
 
 local function exit(tArgs)
@@ -98,10 +105,10 @@ local function exec(tArgs)
 
     -- do some sophisticated file-matching
     -- step 1: exact file
-    if fs.exists(fullFilePath) and fs.isFile(fullFilePath) then 
+    if fs.isFile(fullFilePath) then
         shell.run(fullFilePath, execArgs)
     -- step 2: try appending ".lua"
-    elseif fs.exists(fullFilePath..".lua") and fs.isFile(fullFilePath..".lua") then 
+    elseif fs.isFile(fullFilePath..".lua") then
         shell.run(fullFilePath..".lua", execArgs)
     -- step 3: parse os.path (just like $PATH)
     -- step 3.1: exact file; step 3.2: append ".lua"
@@ -112,11 +119,11 @@ local function exec(tArgs)
 
             debug(path..filePath)
 
-            if fs.exists(path..filePath) and fs.isFile(path..filePath) then
+            if fs.isFile(path..filePath) then
                 execByPathArg = path..filePath
                 execByPathFileExists = true
                 break
-            elseif fs.exists(path..filePath..".lua") and fs.isFile(path..filePath..".lua") then
+            elseif fs.isFile(path..filePath..".lua") then
                 execByPathArg = path..filePath..".lua"
                 execByPathFileExists = true
                 break
@@ -196,7 +203,10 @@ end
 exitshell = false
 
 -- load up aliases
-if fs.exists("/etc/.dshrc") then fs.dofile("/etc/.dshrc") end
+if fs.isFile("/etc/.dshrc") then
+    fs.dofile("/etc/.dshrc")
+    machine.println("[dummix/dsh.lua] Dsh aliases successfully loaded.")
+end
 
 
 -- END OF INIT SHELL ----------------------------------------------------------

src/net/torvald/terrarum/virtualcomputer/assets/loots/dummix/etc/_boot.lua

@@ -25,7 +25,9 @@ os.version = "0.0"
 os.EXIT_SUCCESS = 0
 os.workingDir = {"", "home"} -- index 1 must be ""!
 os.path = "home/bin/;/usr/bin/;/bin/" -- infamous $path
-
+os.fullWorkPath = function()
+	return table.concat(os.workingDir, "/")
+end
 -- @param  "path/of/arbitrary"
 -- @return /working/dir/path/of/arbitrary
 --         input path's trailing '/' is PRESERVED.
@@ -35,10 +37,7 @@ os.expandPath = function(p)
 		return p
 	end
 
-	return table.concat(os.workingDir, "/").."/"..p
-end
-os.fullWorkPath = function()
-	return table.concat(os.workingDir, "/")
+	return os.fullWorkPath().."/"..p
 end
 os.defaultshell = "/bin/dsh.lua"
 os.clock = function() return machine.milliTime() / 1000 end -- uptime of the computer, in seconds

src/net/torvald/terrarum/virtualcomputer/luaapi/Filesystem.kt

@@ -9,6 +9,7 @@ import net.torvald.terrarum.virtualcomputer.computer.BaseTerrarumComputer
 import net.torvald.terrarum.virtualcomputer.luaapi.Term.Companion.checkIBM437
 import java.io.*
 import java.nio.file.Files
+import java.nio.file.NoSuchFileException
 import java.nio.file.Path
 import java.nio.file.Paths
 import java.util.*
@@ -145,6 +146,7 @@ internal class Filesystem(globals: Globals, computer: BaseTerrarumComputer) {
         }
     }
 
+    /** Don't use this. Use isFile */
     class FileExists(val computer: BaseTerrarumComputer) : OneArgFunction() {
         override fun call(path: LuaValue) : LuaValue {
             Filesystem.ensurePathSanity(path)
@@ -165,7 +167,23 @@ internal class Filesystem(globals: Globals, computer: BaseTerrarumComputer) {
         override fun call(path: LuaValue) : LuaValue {
             Filesystem.ensurePathSanity(path)
 
-            return LuaValue.valueOf(!Files.isDirectory(Paths.get(computer.getRealPath(path)).toAbsolutePath()))
+            // check if the path is file by checking:
+            // 1. isfile
+            // 2. canwrite
+            // 3. length
+            // Why? Our Java simply wants to fuck you.
+
+            val path = Paths.get(computer.getRealPath(path)).toAbsolutePath()
+            var result = false
+            result = Files.isRegularFile(path)
+
+            if (!result) result = Files.isWritable(path)
+
+            if (!result)
+                try { result = Files.size(path) > 0 }
+                catch (e: NoSuchFileException) { result = false }
+
+            return LuaValue.valueOf(result)
         }
     }
 

work_files/romapidoc/api_filesystem.tex

@@ -10,7 +10,7 @@ The path for the argument of functions blocks `\,.\,.\,' to be passed, preventin
 	\endhead
 	fs.list(\textbf{path}: string) & table & Returns list of files in \textbf{path}, in lua table.
 	\\ \\
-	fs.exists(\textbf{path}: string) & bool & Checks if \textbf{path} exists on the filesystem.
+	fs.exists(\textbf{path}: string) & bool & Checks if \textbf{path} exists on the filesystem. NOTE: avoid using it as much as you can; it's somewhat erratic.
 	\\ \\
 	fs.isDir(\textbf{path}: string) & bool & Checks if \textbf{path} is a directory.
 	\\ \\