Fixed #12112 -- Made the colors used by syntax highlighting customizable.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12009 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/termcolors.py

@@ -5,7 +5,6 @@ termcolors.py
 color_names = ('black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white')
 foreground = dict([(color_names[x], '3%s' % x) for x in range(8)])
 background = dict([(color_names[x], '4%s' % x) for x in range(8)])
-del color_names
 
 RESET = '0'
 opt_dict = {'bold': '1', 'underscore': '4', 'blink': '5', 'reverse': '7', 'conceal': '8'}
@@ -66,3 +65,112 @@ def make_style(opts=(), **kwargs):
         COMMENT = make_style(fg='blue', opts=('bold',))
     """
     return lambda text: colorize(text, opts, **kwargs)
+
+NOCOLOR_PALETTE = 'nocolor'
+DARK_PALETTE = 'dark'
+LIGHT_PALETTE = 'light'
+
+PALETTES = {
+    NOCOLOR_PALETTE: {
+        'ERROR':        {},
+        'NOTICE':       {},
+        'SQL_FIELD':    {},
+        'SQL_COLTYPE':  {},
+        'SQL_KEYWORD':  {},
+        'SQL_TABLE':    {},
+    },
+    DARK_PALETTE: {
+        'ERROR':        { 'fg': 'red', 'opts': ('bold',) },
+        'NOTICE':       { 'fg': 'red' },
+        'SQL_FIELD':    { 'fg': 'green', 'opts': ('bold',) },
+        'SQL_COLTYPE':  { 'fg': 'green' },
+        'SQL_KEYWORD':  { 'fg': 'yellow' },
+        'SQL_TABLE':    { 'opts': ('bold',) },
+    },
+    LIGHT_PALETTE: {
+        'ERROR':        { 'fg': 'red', 'opts': ('bold',) },
+        'NOTICE':       { 'fg': 'red' },
+        'SQL_FIELD':    { 'fg': 'green', 'opts': ('bold',) },
+        'SQL_COLTYPE':  { 'fg': 'green' },
+        'SQL_KEYWORD':  { 'fg': 'blue' },
+        'SQL_TABLE':    { 'opts': ('bold',) },
+    }
+}
+DEFAULT_PALETTE = DARK_PALETTE
+
+def parse_color_setting(config_string):
+    """Parse a DJANGO_COLORS environment variable to produce the system palette
+
+    The general form of a pallete definition is:
+
+        "palette;role=fg;role=fg/bg;role=fg,option,option;role=fg/bg,option,option"
+
+    where:
+        palette is a named palette; one of 'light', 'dark', or 'nocolor'.
+        role is a named style used by Django
+        fg is a background color.
+        bg is a background color.
+        option is a display options.
+
+    Specifying a named palette is the same as manually specifying the individual
+    definitions for each role. Any individual definitions following the pallete
+    definition will augment the base palette definition.
+
+    Valid roles:
+        'error', 'notice', 'sql_field', 'sql_coltype', 'sql_keyword', 'sql_table'
+
+    Valid colors:
+        'black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white'
+
+    Valid options:
+        'bold', 'underscore', 'blink', 'reverse', 'conceal'
+
+    """
+    if not config_string:
+        return PALETTES[DEFAULT_PALETTE]
+
+    # Split the color configuration into parts
+    parts = config_string.lower().split(';')
+    palette = PALETTES[NOCOLOR_PALETTE].copy()
+    for part in parts:
+        if part in PALETTES:
+            # A default palette has been specified
+            palette.update(PALETTES[part])
+        elif '=' in part:
+            # Process a palette defining string
+            definition = {}
+
+            # Break the definition into the role,
+            # plus the list of specific instructions.
+            # The role must be in upper case
+            role, instructions = part.split('=')
+            role = role.upper()
+
+            styles = instructions.split(',')
+            styles.reverse()
+
+            # The first instruction can contain a slash
+            # to break apart fg/bg.
+            colors = styles.pop().split('/')
+            colors.reverse()
+            fg = colors.pop()
+            if fg in color_names:
+                definition['fg'] = fg
+            if colors and colors[-1] in color_names:
+                definition['bg'] = colors[-1]
+
+            # All remaining instructions are options
+            opts = tuple(s for s in styles if s in opt_dict.keys())
+            if opts:
+                definition['opts'] = opts
+
+            # The nocolor palette has all available roles.
+            # Use that palette as the basis for determining
+            # if the role is valid.
+            if role in PALETTES[NOCOLOR_PALETTE] and definition:
+                palette[role] = definition
+
+    # If there are no colors specified, return the empty palette.
+    if palette == PALETTES[NOCOLOR_PALETTE]:
+        return None
+    return palette