Add pwd utility and performance to cat

cat.nim

@@ -3,11 +3,19 @@ import common
 
 proc catFile(file:string) =
     if not existsFile(file):
-        echo "cat: " & file & ": No such file or directory"
+        err "cat: " & file & ": No such file or directory"
         system.quit 1
-    var s = newFileStream(file, fmRead)
-    while not s.atEnd:
-        write(stdout, s.readChar)
+    const bufSize = 1024
+    var
+        f = open(file, fmRead)
+        buffer {.noinit.}: array[bufSize, char]
+    while true:
+        let readBytes = readBuffer(f, addr(buffer[0]), bufSize)
+        if readBytes == 0:
+            break
+        discard writeBuffer(stdout, addr(buffer[0]), readBytes)
+        if readBytes < bufSize:
+            break
 
 proc catStdin() =
     var line = ""

common.nim

@@ -2,3 +2,6 @@
 
 const
     nimbaseVersion* = "0.0.1"
+
+proc err*(x:string) =
+    writeLine(stderr, x)

nimbase.nimble

@@ -8,6 +8,6 @@ requires      "nim >= 0.19.0"
 requires      "cligen >= 0.9.19"
 requires      "stint >= 0.0.1"
 
-bin           = @["add", "cat", "cp", "div", "echo", "factor", "false", "head", "mkdir", "mul", "rm", "seq", "sleep", "sub", "tee", "touch", "true", "yes"]
+bin           = @["add", "cat", "cp", "div", "echo", "factor", "false", "head", "mkdir", "mul", "pwd", "rm", "seq", "sleep", "sub", "tee", "touch", "true", "yes"]
 
 binDir        = "bin"

pwd.nim

@@ -0,0 +1,7 @@
+import os, cligen
+import common
+
+proc main() =
+    echo getCurrentDir()
+
+dispatch(main, version=("version", nimbaseVersion))