Fixed columns capitalization.

Now the capitalization is preserved, even when internally we match all
using lowercase.

kiplot/bom/bom.py

@@ -149,6 +149,7 @@ class ComponentGroup(object):
         self.cfg = cfg
         # Columns loaded from KiCad
         self.fields = {c.lower(): None for c in ColumnList.COLUMNS_DEFAULT}
+        self.field_names = ColumnList.COLUMNS_DEFAULT
 
     def match_component(self, c):
         """ Test if a given component fits in this group """
@@ -210,12 +211,14 @@ class ComponentGroup(object):
         """ Update a given field, concatenates existing values and informs a collision """
         if not value:
             return
+        field_ori = field
         field = field.lower()
         # Exclude the ones we handle in special ways
         if field in ColumnList.COLUMNS_PROTECTED_L:
             return
         if (field not in self.fields) or (not self.fields[field]):
             self.fields[field] = value
+            self.field_names.append(field_ori)
         elif value.lower() in self.fields[field].lower():
             return
         else:
@@ -433,7 +436,7 @@ def do_bom(file_name, ext, comps, cfg):
     # Read out all available fields
     # TODO: get cached from the list?
     for g in groups:
-        for f in g.fields:
+        for f in g.field_names:
             columns.add_column(f)
     # Don't add 'boards' column if only one board is specified
     # TODO: Shouldn't be the other way (add if needed)

tests/test_plot/test_int_bom.py

@@ -25,7 +25,7 @@ BOM_DIR = 'BoM'
 REF_COLUMN_NAME = 'References'
 QTY_COLUMN_NAME = 'Quantity Per PCB'
 KIBOM_TEST_HEAD = ['Component', 'Description', 'Part', REF_COLUMN_NAME, 'Value', 'Footprint', QTY_COLUMN_NAME, 'Datasheet',
-                   'config']
+                   'Config']
 KIBOM_TEST_COMPONENTS = ['C1', 'C2', 'C3', 'C4', 'R1', 'R2', 'R3', 'R4', 'R5', 'R7', 'R8', 'R9', 'R10']
 KIBOM_TEST_EXCLUDE = ['R6']
 KIBOM_TEST_GROUPS = 5