pipe is wip but && operator kinda works

assets/disk0/tvdos/bin/command.js

@@ -235,8 +235,6 @@ shell.parse = function(input) {
         tokens.push(stringBuffer);
     }
 
-    println(tokens)
-
     return tokens;
 }
 shell.resolvePathInput = function(input) {
@@ -385,16 +383,51 @@ shell.coreutils.chdir = shell.coreutils.cd;
 Object.freeze(shell.coreutils);
 shell.execute = function(line) {
     if (0 == line.size) return;
-    var tokens = shell.parse(line);
+    let parsedTokens = shell.parse(line); // echo, "hai", |, less
-    var cmd = tokens[0];
+    let statements = [] // [[echo, "hai"], [less]]
-    if (cmd === undefined || cmd === '') return 0;
+    let operators = [] // [|]
+
+    let opRegex = /[|>&<]/
+    let stmtBuf = []
+    parsedTokens.forEach((tok, i) => {
+        if (tok.match(opRegex)) {
+            operators.push(tok)
+            statements.push(stmtBuf.slice())
+            stmtBuf = []
+        }
+        else {
+            stmtBuf.push(tok)
+        }
+    })
+    if (stmtBuf[0] !== undefined) {
+        statements.push(stmtBuf.slice())
+    }
+
+    let retValue = undefined // return value of the previous statement
+    for (let c = 0; c < statements.length; c++) {
+        let op = operators[c]
+
+        // TODO : if operator is not undefined, swap built-in print functions with ones that 'prints' on pipes instead of stdout
+
+
+        let tokens = statements[c]
+
+        let cmd = tokens[0];
+        if (cmd === undefined || cmd === '') {
+            retValue = 0;
+            continue
+        }
 
         // handle Ctrl-C
-    if (con.hitterminate()) return 1;
+        if (con.hitterminate()) {
+            retValue = 1;
+            continue
+        }
 
         if (shell.coreutils[cmd.toLowerCase()] !== undefined) {
             var retval = shell.coreutils[cmd.toLowerCase()](tokens);
-        return retval|0; // return value of undefined will cast into 0
+            retValue = retval|0; // return value of undefined will cast into 0
+            continue
         }
         else {
             // search through PATH for execution
@@ -428,7 +461,8 @@ shell.execute = function(line) {
 
             if (!fileExists) {
                 printerrln('Bad command or filename: "'+cmd+'"');
-            return 127;
+                retValue = 127;
+                continue
             }
             else {
                 var programCode = filesystem.readAll(CURRENT_DRIVE);
@@ -439,7 +473,7 @@ shell.execute = function(line) {
 
                 if ("BAT" == extension) {
                     // parse and run as batch file
-                var lines = programCode.split('\n').filter(function(it) { return it.length > 0; });
+                    var lines = programCode.split('\n').filter(function(it) { return it.length > 0 }); // this return is not shell's return!
                     lines.forEach(function(line) {
                         shell.execute(line);
                     });
@@ -482,11 +516,15 @@ shell.execute = function(line) {
                         sendLcdMsg(_G.shellProgramTitles[_G.shellProgramTitles.length - 1]);
                         //serial.println(_G.shellProgramTitles);
 
-                    return errorlevel;
+                        retValue = errorlevel;
+                        continue
                     }
                 }
             }
         }
+
+        return retValue
+    }
 };
 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.