more pipe stuffs

assets/bios/openbios.js

@@ -28,7 +28,12 @@ function bootFromPort(port) {
         else throw "No Bootsector"
     }
     catch (e) {
-        printerrln(`No bootable medium on COM ${port+1}`)
+        if ("No Bootsector" == e)
+            printerrln(`No bootable medium on COM ${port+1}`)
+        else
+            printerrln(`Boot failed with errors:\n\n${e}`)
+
+        serial.printerr(e)
     }
 }
 
@@ -152,7 +157,7 @@ showHowtoEnterMenu()
 let bootable = probeBootable()
 let sysRq = false
 let tmr = sys.nanoTime()
-while (sys.nanoTime() - tmr < 5 * 1000000000.0) {
+while (sys.nanoTime() - tmr < 3 * 1000000000.0) {
     sysRq = sys.getSysrq()
     if (sysRq) break
     sys.spin()

assets/disk0/tvdos/TVDOS.SYS

@@ -76,8 +76,7 @@ filesystem._close = (portNo) => {
 filesystem._flush = (portNo) => {
     com.sendMessage(portNo, "FLUSH");
 };
-// @return true if operation committed successfully, false if:
+// @return disk status code (0 for successful operation)
-//             - opening file with R-mode and target file does not exists
 //         throws if:
 //             - java.lang.NullPointerException if path is null
 //             - Error if operation mode is not "R", "W" nor "A"

assets/disk0/tvdos/bin/command.js

@@ -456,6 +456,34 @@ shell.execute = function(line) {
     }
 };
 shell.pipes = {}; // syntax: _G.shell.pipes[name] = contents; all pipes are named pipes just like in Windows
+shell.currentlyActivePipes = []; // pipe queue. Use shell.getPipe() to dequeue and shell.pushPipe() to enqueue.
+shell._rndstr = '0123456789+qwfpgjluyarstdhneiozxcvbkm/QWFPGJLUYARSTDHNEIOZXCVBKM'
+shell.generateRandomName = function() {
+    let name = ''
+    while (true) {
+        name = "anonpipe_"
+        for (let k = 0; k < 32; k++) {
+            name += shell._rndstr[(Math.random() * 64)|0]
+        }
+        if (shell.pipes[name] == undefined) break
+    }
+    return name
+}
+shell.getPipe = function() {
+    let n = shell.currentlyActivePipes.shift()
+    return (n != undefined) ? shell.pipes[n] : undefined
+}
+shell.pushAnonPipe = function(contents) {
+    let name = shell.generateRandomName()
+    shell.pushPipe(name, contents)
+}
+shell.pushPipe = function(name, contents) {
+    shell.pipes[name] = contents
+    shell.currentlyActivePipes.unshift(name)
+}
+shell.hasPipe = function() {
+    return shell.currentlyActivePipes[0] != undefined
+}
 Object.freeze(shell);
 _G.shell = shell;
 

assets/disk0/tvdos/bin/less.js

@@ -1,7 +1,4 @@
-if (exec_args[1] === undefined) {
+let filename = exec_args[1]
-    println('Missing filename ("less -?" for help)');
-    return 0;
-}
 
 /*let help = "\n
 SUMMARY OF COMMANDS\n
@@ -10,27 +7,46 @@ SUMMARY OF COMMANDS\n
   q   Q            Exit
 \n"*/
 
-if (exec_args[1].startsWith("-?")) {
-    println("less <filename>");
-    return 0;
-}
-
-let fileOpened = filesystem.open(_G.shell.getCurrentDrive(), _G.shell.resolvePathInput(exec_args[1]).string, "R");
-if (!fileOpened) {
-    printerrln(_G.shell.resolvePathInput(exec_args[1]).string+": cannot open");
-    return 1;
-}
-
 let scroll = 0;
 let pan = -1;
 let termW = con.getmaxyx()[1];
 let termH = con.getmaxyx()[0] - 1;
 let buf = "";
-let fileContent = filesystem.readAll(_G.shell.getCurrentDrive());
+let fileContent = undefined
 let key = -1;
 let panSize = termW >> 1;
 let scrollSize = termH >> 3;
 
+let startAddr = -1;
+let paintCur = 0;
+let cy = 1;
+let cx = 1;
+let char = -1;
+
+let numbuf = 0;
+
+if (filename === undefined && _G.shell.hasPipe()) {
+    fileContent = _G.shell.getPipe()
+}
+else if (filename === undefined) {
+    println('Missing filename ("less -?" for help)');
+    return 0;
+}
+else {
+    if (filename.startsWith("-?")) {
+        println("less <filename>");
+        return 0;
+    }
+
+    let fileOpened = filesystem.open(_G.shell.getCurrentDrive(), _G.shell.resolvePathInput(filename).string, "R");
+    if (fileOpened != 0) {
+        printerrln(_G.shell.resolvePathInput(filename).string+": cannot open");
+        return 1;
+    }
+
+    fileContent = filesystem.readAll(_G.shell.getCurrentDrive());
+}
+
 // initialise some helper variables
 let lineToBytes = [0];
 let maxPan = 0;
@@ -45,13 +61,8 @@ for (let i = 0; i < fileContent.length; i++) {
     }
 }
 
-let startAddr = -1;
-let paintCur = 0;
-let cy = 1;
-let cx = 1;
-let char = -1;
 
-let numbuf = 0;
+
 
 let resetKeyReadStatus = function() {
     numbuf = 0;