From e353b1b17701e54a0d9f93e42b1956acdf253cc7 Mon Sep 17 00:00:00 2001
From: Calvin Morrison <mutantturkey@gmail.com>
Date: Tue, 23 Jul 2013 13:56:02 -0400
Subject: add supportfor multiple rows and piping between them

---
 pc.py | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 76 insertions(+), 19 deletions(-)

diff --git a/pc.py b/pc.py
index 1a721d9..48d51b5 100755
--- a/pc.py
+++ b/pc.py
@@ -34,19 +34,63 @@ input_buffer = ""
 cols = int(subprocess.check_output(["tput", "cols"]))
 rows = int(subprocess.check_output(["tput", "lines"]))
 
-def call_process(process, string):
-  process = Popen(["sed", "-e", string], stdout=PIPE, stdin=PIPE, stderr=PIPE) 
-  ret = process.communicate(input_buffer)
+def call_process(process, pipe, stdin):
+  process = Popen(["sed", pipe], stdout=PIPE, stdin=PIPE, stderr=PIPE) 
+  ret = process.communicate(stdin)
   if(process.returncode is not 0):
-    screen.addstr(ret[1][:-1].ljust(cols), curses.color_pair(2));
+    return (ret[1], 1)
   else:
-    screen.addstr(ret[0]);
+    return (ret[0], 0)
   return
 
+def call_pipes(a, pipe_array):
+
+  # start first one with input buffer
+  ret = call_process("sed", pipe_array[0], input_buffer)
+
+  if(len(pipe_array) == 1):
+    if(ret[1] != 0):
+        error = "Error on line 0:" + ret[0][:-1]
+        screen.addstr(error.ljust(cols), curses.color_pair(4));
+    else:
+      screen.addstr(ret[0])
+    return
+
+  p = ret[0];
+  for i in range(1, len(pipe_array)):
+    ret = call_process("sed", pipe_array[i], p);
+    if(ret[1] != 0):
+        error = "Error on line " + str(i) + ":" + ret[0][:-1]
+        screen.addstr(error.ljust(cols), curses.color_pair(4));
+    else:
+      p = ret[0];
+  
+  screen.addstr(p)
+
+def update(pipe_array, current_pipe):
+  draw_pipes(pipe_array, current_pipe)
+  call_pipes("sed", pipe_array)
+  screen.addstr("EOF")
+
+def draw_pipes(pipe_array, current_pipe):
+
+  for pipe, num in map(None, pipe_array, range(0, len(pipe_array))):
+    color = 1
+    if(num == current_pipe):
+      color = 3
+
+    screen.addstr(num, 0, str(num), curses.color_pair(2)) 
+    screen.addstr(num, len(str(num)), " " + pipe.ljust(cols - len(str(num)) - 1), curses.color_pair(color))
+
 
 def main(argv):
 
-  input_string = ""
+  pipe_array = [];
+  command_array = [];
+  enable_array = [];
+  pipe_array.append("");
+  current_pipe = 0;
+
   global input_buffer
 
   try:
@@ -66,24 +110,37 @@ def main(argv):
     while 1:
       key = screen.getch()
       screen.clear()
-      if(key > 256):
+      screen.addstr(rows - 1, 0, str(key) + " " + str(current_pipe))
+      # UP
+      if(key == 259):
+        if(current_pipe is not 0):
+          current_pipe = current_pipe - 1;
+        update(pipe_array, current_pipe)
         continue;
-      if(key == 127):
-        input_string = input_string[:-1]
-        screen.addstr(input_string.ljust(cols), curses.color_pair(1));
-        screen.addstr(input_buffer)
-        screen.addstr("EOF")
+      # DOWN
+      if(key == 258):
+        if(current_pipe == len(pipe_array) -1):
+          pipe_array.append("");
+        current_pipe = current_pipe + 1;
+        update(pipe_array, current_pipe);
         continue;
-      elif(key == 13 or key == 10):
-        screen.addstr(input_string.ljust(cols), curses.color_pair(1));
-        call_process("sed", input_string)
+      # BACKSPACE
+      if(key == 263):
+        if(len(pipe_array[current_pipe]) is not 0):
+          pipe_array[current_pipe] = pipe_array[current_pipe][:-1]
+        else:
+          if(current_pipe is not 0):
+            del pipe_array[current_pipe]
+            current_pipe = current_pipe - 1
+        draw_pipes(pipe_array, current_pipe)
+        screen.addstr(input_buffer)
         screen.addstr("EOF")
         continue;
+      # ENTER
       else:
-        input_string+=chr(key)
-        screen.addstr(input_string.ljust(cols), curses.color_pair(1));
-        screen.addstr(input_buffer)
-        screen.addstr("EOF")
+        if(key < 256):
+          pipe_array[current_pipe]+=chr(key)
+        update(pipe_array, current_pipe);
   finally:
     curses.endwin()
 
-- 
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