Add resource-stdout tool

bin/Rget

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+
+import argparse
+import macresources
+import sys
+
+def fourcc(s):
+    b = s.encode('mac_roman').ljust(4, b' ')
+    if len(b) != 4:
+        raise ValueError('wrong length')
+    return b
+
+def seemshex(s):
+    s = s.lower()
+    if not s: return False
+    return all(c in '0123456789abcdef' for c in s)
+
+def seemsdec(s):
+    if not s: return False
+    return all(c in '0123456789' for c in s)
+
+def resid(s):
+    s = s.lower()
+    if s.startswith('0x') and seemshex(s[2:]):
+        thenum = int(s[2:], 16)
+        if thenum > 0x7fff: thenum -= 0x8000
+    elif s.startswith('$') and seemshex(s[1:]):
+        thenum = int(s[1:], 16)
+        if thenum > 0x7fff: thenum -= 0x8000
+    else:
+        thenum = int(s)
+    if not (-0x8000 <= thenum <= 0x7fff): raise ValueError
+    return thenum
+
+parser = argparse.ArgumentParser(description='''
+    Copy a single MacOS resource from a source file to the standard
+    output. If the source filename ends with `.r' or `.rdump', then it
+    is parsed using the `SimpleRez' subset of the Rez language. TODO:
+    find a way to specify null characters so that desk accessories can
+    be looked up by name.
+''')
+
+parser.add_argument('srcfile', help='resource file or Rez file')
+parser.add_argument('type', type=fourcc, help='four-byte type of resource (converted to Mac Roman pre-lookup)')
+parser.add_argument('id', type=resid, help='ID number of resource (-32768 to 32767)')
+
+args = parser.parse_args()
+
+with open(args.srcfile, 'rb') as f:
+    raw = f.read()
+
+if args.srcfile.endswith('.r') or args.srcfile.endswith('.rdump'):
+    resources = macresources.parse_rez_code(raw)
+else:
+    resources = macresources.parse_file(raw)
+
+for r in resources:
+    if r.type == args.type and r.id == args.id:
+        try:
+            sys.stdout.buffer.write(r.data)
+        except BrokenPipeError:
+            pass
+        break
+else:
+    raise ValueError(args.type, args.id)

setup.py

@@ -18,5 +18,5 @@ setup(
         'Development Status :: 3 - Alpha',
     ],
     packages=['macresources'],
-    scripts=['bin/SimpleRez', 'bin/SimpleDeRez'],
+    scripts=['bin/SimpleRez', 'bin/SimpleDeRez', 'bin/Rget'],
 )