NF: -H for nib-ls to list desired header fields

Author: yarikoptic

bin/nib-ls

@@ -13,7 +13,7 @@ Output a summary table for neuroimaging files (resolution, dimensionality, etc.)
 from __future__ import division, print_function, absolute_import
 
 __author__ = 'Yaroslav Halchenko'
-__copyright__ = 'Copyright (c) 2011-2012 Yaroslav Halchenko ' \
+__copyright__ = 'Copyright (c) 2011-2015 Yaroslav Halchenko ' \
                 'and NiBabel contributors'
 __license__ = 'MIT'
 
@@ -141,6 +141,10 @@ def get_opt_parser():
                dest="verbose", default=0,
                help="Make more noise.  Could be specified multiple times"),
 
+        Option("-H", "--header-fields",
+               dest="header_fields", default='',
+               help="Header fields (comma separated) to be printed as well (if present)"),
+
         Option("-s", "--stats",
                action="store_true", dest='stats', default=False,
                help="Output basic data statistics"),
@@ -180,6 +184,22 @@ def proc_file(f, opts):
     else:
         row += [ '' ]
 
+    if opts.header_fields:
+        # signals "all fields"
+        if opts.header_fields == '*':
+            # TODO: might vary across file types, thus prior sensing would be needed
+            header_fields = h.keys()
+        else:
+            header_fields = opts.header_fields.split(',')
+
+        for f in header_fields:
+            if not f: # skip empty
+                continue
+            try:
+                row += [str(h[f])]
+            except (KeyError, ValueError):
+                row += [ '' ]
+
     try:
         if (hasattr(h, 'get_qform') and hasattr(h, 'get_sform')
             and (h.get_qform() != h.get_sform()).any()):