backend: Add Schemer2

pywal/backends/__init__.py

@@ -11,10 +11,12 @@ Created by Dylan Araps.
 
 from . import colorthief
 from . import colorz
+from . import schemer2
 from . import wal
 
 __all__ = [
     "colorthief",
     "colorz",
+    "schemer2",
     "wal",
 ]

pywal/backends/colorthief.py

@@ -7,7 +7,7 @@ try:
     from colorthief import ColorThief
 
 except ImportError:
-    print("Error: ColorThief wasn't found on your system.",
+    print("error: ColorThief wasn't found on your system.",
           "Try another backend. (wal --backend)")
     sys.exit(1)
 

pywal/backends/colorz.py

@@ -10,8 +10,8 @@ from .. import util
 
 def gen_colors(img):
     """Generate a colorscheme using Colorz."""
-    colorz = ["colorz", "-n", "6", "--bold", "0", "--no-preview"]
-    return subprocess.check_output([*colorz, img]).splitlines()
+    cmd = ["colorz", "-n", "6", "--bold", "0", "--no-preview"]
+    return subprocess.check_output([*cmd, img]).splitlines()
 
 
 def adjust(colors, light):
@@ -43,7 +43,7 @@ def adjust(colors, light):
 def get(img, light=False):
     """Get colorscheme."""
     if not shutil.which("colorz"):
-        print("Error: Colorz wasn't found on your system.",
+        print("error: Colorz wasn't found on your system.",
               "Try another backend. (wal --backend)")
         sys.exit(1)
 

pywal/backends/schemer2.py

@@ -0,0 +1,52 @@
+"""
+Generate a colorscheme using Schemer2.
+"""
+import shutil
+import subprocess
+import sys
+
+from .. import util
+
+
+def gen_colors(img):
+    """Generate a colorscheme using Colorz."""
+    cmd = ["schemer2", "-format", "img::colors", "-minBright", "75", "-in"]
+    return subprocess.check_output([*cmd, img]).splitlines()
+
+
+def adjust(colors, light):
+    """Create palette."""
+    # Create list with placeholder values.
+    colors.sort(key=util.rgb_to_yiq)
+    raw_colors = [*colors[8:], *colors[8:]]
+
+    # Update placeholder values.
+    if light:
+        for color in raw_colors:
+            color = util.saturate_color(color, 0.50)
+            color = util.darken_color(color, 0.4)
+
+        raw_colors[0] = util.lighten_color(colors[0], 0.9)
+        raw_colors[7] = util.darken_color(colors[0], 0.75)
+        raw_colors[8] = util.darken_color(colors[0], 0.25)
+        raw_colors[15] = raw_colors[7]
+
+    else:
+        raw_colors[0] = util.darken_color(colors[0], 0.75)
+        raw_colors[7] = util.lighten_color(colors[0], 0.75)
+        raw_colors[8] = util.lighten_color(colors[0], 0.25)
+        raw_colors[15] = raw_colors[7]
+
+    return raw_colors
+
+
+def get(img, light=False):
+    """Get colorscheme."""
+    if not shutil.which("schemer2"):
+        print("error: Schemer2 wasn't found on your system.",
+              "Try another backend. (wal --backend)")
+        sys.exit(1)
+
+    colors = gen_colors(img)
+    colors = [color.decode('UTF-8') for color in colors]
+    return adjust(colors, light)

pywal/backends/wal.py

@@ -26,7 +26,7 @@ def has_im():
     elif shutil.which("convert"):
         return ["convert"]
 
-    print("Error: ImageMagick wasn't found on your system.",
+    print("error: ImageMagick wasn't found on your system.",
           "Try another backend. (wal --backend)")
     sys.exit(1)