Merge pull request #474 from AmitPr/master

Add ability to run functions on colors from templates

3 files changed, 63 insertions, 9 deletions

diff --git a/README.md b/README.md
index 0e14f97..443cca3 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@
 
 <img src="https://i.imgur.com/HhK3LDv.jpg" alt="img" align="right" width="400px">
 
-Pywal is a tool that generates a color palette from the dominant colors in an image. It then applies the colors system-wide and on-the-fly in all of your favourite programs.
+Pywal is a tool that generates a color palette from the dominant colors in an image. It then applies the colors system-wide and on-the-fly in all of your favourite programs.  
 
 There are currently 5 supported color generation backends, each providing a different palette of colors from each image. You're bound to find an appealing color-scheme.
 
@@ -21,4 +21,4 @@ The goal of Pywal was to be as out of the way as possible. It doesn't modify any
 
 Terminal emulators and TTYs have their color-schemes updated in real-time with no delay. With minimal configuration this functionality can be extended to almost anything running on your system.
 
-### More: \[[Installation](https://github.com/dylanaraps/pywal/wiki/Installation)\] \[[Getting Started](https://github.com/dylanaraps/pywal/wiki/Getting-Started)\] \[[Customization](https://github.com/dylanaraps/pywal/wiki/Customization)\] \[[Wiki](https://github.com/dylanaraps/pywal/wiki)\] \[[Screenshots](https://www.reddit.com/r/unixporn/search?q=wal&restrict_sr=on&sort=relevance&t=all)\]
+### More: \[[Installation](https://github.com/dylanaraps/pywal/wiki/Installation)] \[[Getting Started](https://github.com/dylanaraps/pywal/wiki/Getting-Started)] \[[Customization](https://github.com/dylanaraps/pywal/wiki/Customization)] \[[Wiki](https://github.com/dylanaraps/pywal/wiki)] \[[Screenshots](https://www.reddit.com/r/unixporn/search?q=wal&restrict_sr=on&sort=relevance&t=all)]
diff --git a/pywal/export.py b/pywal/export.py
index 88c98a6..d9ff16d 100644
--- a/pywal/export.py
+++ b/pywal/export.py
@@ -3,22 +3,60 @@ Export colors in various formats.
 """
 import logging
 import os
+import re
 
-from .settings import CACHE_DIR, MODULE_DIR, CONF_DIR
 from . import util
+from .settings import CACHE_DIR, CONF_DIR, MODULE_DIR
 
 
 def template(colors, input_file, output_file=None):
     """Read template file, substitute markers and
        save the file elsewhere."""
     template_data = util.read_file_raw(input_file)
-
+    for i, l in enumerate(template_data):
+        for match in re.finditer(r"(?<=(?<!\{))(\{([^{}]+)\})(?=(?!\}))", l):
+            # Get the color, and the functions associated with it
+            cname, _, funcs = match.group(2).partition(".")
+            # Check that functions are needed for this color
+            if len(funcs) == 0:
+                continue
+            # Build up a string which will be replaced with the new color
+            replace_str = cname
+            # Color to be modified copied into new one
+            new_color = util.Color(colors[cname].hex_color)
+            # Execute each function to be done
+            for func in filter(None, funcs.split(")")):
+                # Get function name and arguments
+                func = func.split("(")
+                fname = func[0]
+                if fname[0] == '.':
+                    fname = fname[1:]
+                if not hasattr(new_color, fname):
+                    logging.error(
+                        "Syntax error in template file '%s' on line '%s'",
+                        input_file, i)
+                function = getattr(new_color, fname)
+
+                # If the function is callable, call it
+                if callable(function):
+                    if len(func) > 1:
+                        new_color = function(*func[1].split(","))
+                    else:
+                        new_color = function()
+                    # string to replace generated colors
+                    if func[0] != '.':
+                        replace_str += "."
+                    replace_str += "(".join(func) + ")"
+            # If the color was changed, replace with a unique identifier.
+            if new_color is not colors[cname]:
+                template_data[i] = l.replace(
+                    replace_str, "color" + new_color.strip)
+                colors["color" + new_color.strip] = new_color
     try:
         template_data = "".join(template_data).format(**colors)
     except ValueError:
         logging.error("Syntax error in template file '%s'.", input_file)
         return
-
     util.save_file(template_data, output_file)
 
 
diff --git a/pywal/util.py b/pywal/util.py
index e4b146a..cd6628a 100644
--- a/pywal/util.py
+++ b/pywal/util.py
@@ -5,10 +5,11 @@ import colorsys
 import json
 import logging
 import os
+import platform
+import re
 import shutil
 import subprocess
 import sys
-import platform
 
 
 class Color:
@@ -35,7 +36,7 @@ class Color:
     def rgba(self):
         """Convert a hex color to rgba."""
         return "rgba(%s,%s,%s,%s)" % (*hex_to_rgb(self.hex_color),
-                                      int(self.alpha_num)/100)
+                                      int(self.alpha_num) / 100)
 
     @property
     def alpha(self):
@@ -57,6 +58,21 @@ class Color:
         """Strip '#' from color."""
         return self.hex_color[1:]
 
+    def lighten(self, percent):
+        """Lighten color by percent"""
+        percent = float(re.sub(r'[\D\.]', '', str(percent)))
+        return Color(lighten_color(self.hex_color, percent / 100))
+
+    def darken(self, percent):
+        """Darken color by percent"""
+        percent = float(re.sub(r'[\D\.]', '', str(percent)))
+        return Color(darken_color(self.hex_color, percent / 100))
+
+    def saturate(self, percent):
+        """Saturate a color"""
+        percent = float(re.sub(r'[\D\.]', '', str(percent)))
+        return Color(saturate_color(self.hex_color, percent / 100))
+
 
 def read_file(input_file):
     """Read data from a file and trim newlines."""
@@ -156,11 +172,11 @@ def blend_color(color, color2):
 def saturate_color(color, amount):
     """Saturate a hex color."""
     r, g, b = hex_to_rgb(color)
-    r, g, b = [x/255.0 for x in (r, g, b)]
+    r, g, b = [x / 255.0 for x in (r, g, b)]
     h, l, s = colorsys.rgb_to_hls(r, g, b)
     s = amount
     r, g, b = colorsys.hls_to_rgb(h, l, s)
-    r, g, b = [x*255.0 for x in (r, g, b)]
+    r, g, b = [x * 255.0 for x in (r, g, b)]
 
     return rgb_to_hex((int(r), int(g), int(b)))