Add rm utility and improve further

cat.nim

@@ -1,15 +1,26 @@
 import cligen, os, streams
 import common
 
+proc catFile(file:string) =
+    if not existsFile(file):
+        echo "cat: " & file & ": No such file or directory"
+        return
+    var s = newFileStream(file, fmRead)
+    while not s.atEnd:
+        write(stdout, s.readChar)
+
+proc catStdin() =
+    var line = ""
+    while stdin.readLine(line):
+        echo line
+
 proc main(files:seq[string]) =
+    if files.len == 0:
+        catStdin()
     for file in files:
         if file == "-":
-            var line = ""
+            catStdin()
-            while stdin.readLine(line):
-                echo line
         else:
-            var s = newFileStream(file, fmRead)
+            catFile(file)
-            while not s.atEnd:
-                write(stdout, s.readChar)
 
 dispatch(main, version=("version", nimbaseVersion))

head.nim

@@ -2,6 +2,8 @@ import cligen, os, streams
 import common
 
 proc main(files:seq[string], lines=10, bytes=0) =
+#    if files.len == 0:
+#        files.add "-"
     for file in files:
         var s = newFileStream(file, fmRead)
         if bytes > 0:

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", "seq", "sleep", "sub", "tee", "true", "yes"]
+bin           = @["add", "cat", "cp", "div", "echo", "factor", "false", "head", "mkdir", "mul", "rm", "seq", "sleep", "sub", "tee", "true", "yes"]
 
 binDir        = "bin"

rm.nim

@@ -0,0 +1,16 @@
+import cligen, os
+import common
+
+proc main(files:seq[string], force=false, recursive=false) =
+    for file in files:
+        if existsFile(file):
+            removeFile(file)
+        elif existsDir(file):
+            if recursive:
+                removeDir(file)
+            else:
+                echo "rm: cannot remove '" & file & "': Is a directory"
+        else:
+            echo "rm: cannot remove '" & file & "': No such file or directory"
+
+dispatch(main, version=("version", nimbaseVersion))