add strip, rstrip, and lstrip commands; add sample files

a

@@ -0,0 +1,3 @@
+  1  
+    2  
+      3

a.c

@@ -0,0 +1,8 @@
+#!/usr/bin/env -S sh -c '[ "$0".bin -nt "$0" ] || tail -n+2 "$0" | cc -x c - -o "$0".bin || exit 1; exec "$0".bin "$@"'
+#include <stdio.h>
+
+int main(void)
+{
+    printf("Hello, world!\n");
+    return 0;
+}

lib/dorian/bin.rb

@@ -206,6 +206,18 @@ def run
         arguments.delete("ls")
         @command = :ls
         command_ls
+      when :strip
+        arguments.delete("strip")
+        @command = :strip
+        command_strip
+      when :rstrip
+        arguments.delete("rstrip")
+        @command = :rstrip
+        command_rstrip
+      when :lstrip
+        arguments.delete("lstrip")
+        @command = :lstrip
+        command_lstrip
       else
         arguments.delete("read")
         @command = :read
@@ -266,6 +278,36 @@ def command_read
       each(stdin_arguments + arguments) { |input| outputs(reads(input)) }
     end
 
+    def command_strip
+      each(stdin_files + files) do |input|
+        outputs(lines(reads(File.read(input)), strip: :strip), file: input)
+      end
+
+      each(stdin_arguments + arguments) do |input|
+        outputs(lines(reads(input), strip: :strip))
+      end
+    end
+
+    def command_rstrip
+      each(stdin_files + files) do |input|
+        outputs(lines(reads(File.read(input)), strip: :rstrip), file: input)
+      end
+
+      each(stdin_arguments + arguments) do |input|
+        outputs(lines(reads(input), strip: :rstrip))
+      end
+    end
+
+    def command_lstrip
+      each(stdin_files + files) do |input|
+        outputs(lines(reads(File.read(input)), strip: :lstrip), file: input)
+      end
+
+      each(stdin_arguments + arguments) do |input|
+        outputs(lines(reads(input), strip: :lstrip))
+      end
+    end
+
     def everything
       read_stdin_files + stdin_arguments + read_files + arguments
     end
@@ -724,9 +766,9 @@ def reject(collection, progress: false, &)
       end
     end
 
-    def lines(input)
+    def lines(input, strip: :rstrip)
       if input.is_a?(String)
-        input.lines.map(&:rstrip)
+        input.lines.map(&strip)
       elsif deep?
         deep_lines(input)
       else