Fix reading past EOF + .nfp viewer

ccpi.lua

@@ -41,7 +41,12 @@ local function load(path)
         local line = { s = "", bg = "", fg = "" }
         for x = 1, image.w do
             line.s = line.s .. fp:read(1)
-            local color = string.byte(fp:read(1))
+            local char = fp:read(1)
+            if char == nil then
+                printError("Fatal: failed to read color data for y=" .. y .. " x=" .. x)
+                break
+            end
+            local color = string.byte(char)
             line.bg = line.bg .. string.format("%x", bit32.band(0xF, color))
             line.fg = line.fg .. string.format("%x", bit32.band(0xF, bit32.rshift(color, 4)))
         end

nfpview.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+from argparse import ArgumentParser
+
+colors = {
+  "0": (240, 240, 240),
+  "1": (242, 178,  51),
+  "2": (229, 127, 216),
+  "3": (153, 178, 242),
+  "4": (222, 222, 108),
+  "5": (127, 204,  25),
+  "6": (242, 178, 204),
+  "7": ( 76,  76,  76),
+  "8": (153, 153, 153),
+  "9": ( 76, 153, 178),
+  "a": (178, 102, 229),
+  "b": ( 51, 102, 204),
+  "c": (127, 102,  76),
+  "d": ( 87, 166,  78),
+  "e": (204,  76,  76),
+  "f": ( 17,  17,  17),
+}
+
+color_names = {
+  "0": "white",
+  "1": "orange",
+  "2": "magenta",
+  "3": "lightBlue",
+  "4": "yellow",
+  "5": "lime",
+  "6": "pink",
+  "7": "gray",
+  "8": "lightGray",
+  "9": "cyan",
+  "a": "purple",
+  "b": "blue",
+  "c": "brown",
+  "d": "green",
+  "e": "red",
+  "f": "black",
+}
+
+parser = ArgumentParser(description="CC default image viewer")
+parser.add_argument("filename")
+
+def color(v: str):
+    return tuple(bytes.fromhex(v.lstrip('#')))
+
+
+for k, (r, g, b) in colors.items():
+    parser.add_argument(f"-{k}", type=color, default=(r, g, b),
+                        help="Set color %s" % color_names[k])
+
+args = parser.parse_args()
+
+with open(args.filename, "r") as fp:
+    for line in fp:
+        for char in line.rstrip():
+            if char in colors:
+                print("\x1b[48;2;%d;%d;%dm \x1b[0m" % colors[char], end="")
+            else:
+                print(" ", end="")
+        print()