backend: initial work to add more backends

1 files changed, 15 insertions, 99 deletions

diff --git a/pywal/colors.py b/pywal/colors.py
index f47ac33..b7e274d 100644
--- a/pywal/colors.py
+++ b/pywal/colors.py
@@ -1,109 +1,25 @@
 """
-Generate a colorscheme using imagemagick.
+Generate a palette using various backends.
 """
-import os
 import re
-import shutil
-import subprocess
-import sys
+import os
 
-from .settings import CACHE_DIR, COLOR_COUNT, __cache_version__
+from . import backends
 from . import util
+from .settings import CACHE_DIR, COLOR_COUNT, __cache_version__
 
 
-def imagemagick(color_count, img, magick_command):
-    """Call Imagemagick to generate a scheme."""
-    flags = ["-resize", "25%", "-colors", str(color_count),
-             "-unique-colors", "txt:-"]
-    img += "[0]"
-
-    return subprocess.check_output([*magick_command, img, *flags]).splitlines()
-
-
-def has_im():
-    """Check to see if the user has im installed."""
-    if shutil.which("magick"):
-        return ["magick", "convert"]
-
-    elif shutil.which("convert"):
-        return ["convert"]
-
-    print("error: imagemagick not found, exiting...\n"
-          "error: wal requires imagemagick to function.")
-    sys.exit(1)
-
-
-def gen_colors(img, color_count):
-    """Format the output from imagemagick into a list
-       of hex colors."""
-    magick_command = has_im()
-
-    for i in range(0, 20, 1):
-        raw_colors = imagemagick(color_count + i, img, magick_command)
-
-        if len(raw_colors) > 16:
-            break
-
-        elif i == 19:
-            print("colors: Imagemagick couldn't generate a suitable scheme",
-                  "for the image. Exiting...")
-            sys.exit(1)
-
-        else:
-            print("colors: Imagemagick couldn't generate a %s color palette, "
-                  "trying a larger palette size %s."
-                  % (color_count, color_count + i))
-
-    return [re.search("#.{6}", str(col)).group(0) for col in raw_colors[1:]]
-
-
-def create_palette(img, colors, light):
-    """Sort the generated colors and store them in a dict that
-       we will later save in json format."""
-    raw_colors = colors[:1] + colors[8:16] + colors[8:-1]
-
-    if light:
-        # Manually adjust colors.
-        raw_colors[7] = raw_colors[0]
-        raw_colors[0] = util.lighten_color(raw_colors[15], 0.85)
-        raw_colors[15] = raw_colors[7]
-        raw_colors[8] = util.lighten_color(raw_colors[7], 0.25)
-
-    else:
-        # Darken the background color slightly.
-        if raw_colors[0][1] != "0":
-            raw_colors[0] = util.darken_color(raw_colors[0], 0.25)
-
-        # Manually adjust colors.
-        raw_colors[7] = util.blend_color(raw_colors[7], "#EEEEEE")
-        raw_colors[8] = util.darken_color(raw_colors[7], 0.30)
-        raw_colors[15] = util.blend_color(raw_colors[15], "#EEEEEE")
-
-    colors = {"wallpaper": img, "alpha": util.Color.alpha_num,
-              "special": {}, "colors": {}}
-    colors["special"]["background"] = raw_colors[0]
-    colors["special"]["foreground"] = raw_colors[15]
-    colors["special"]["cursor"] = raw_colors[15]
-
-    if light:
-        for i, color in enumerate(raw_colors):
-            colors["colors"]["color%s" % i] = util.saturate_color(color, 0.5)
-
-        colors["colors"]["color0"] = raw_colors[0]
-        colors["colors"]["color7"] = raw_colors[15]
-        colors["colors"]["color8"] = util.darken_color(raw_colors[0], 0.5)
-        colors["colors"]["color15"] = raw_colors[15]
-
-    else:
-        for i, color in enumerate(raw_colors):
-            colors["colors"]["color%s" % i] = color
-
-    return colors
+def get(backend_type="wal"):
+    """Get backend function name from name."""
+    return {
+        "wal": backends.wal.get,
+    }.get(backend_type, backend_type)
 
 
-def get(img, cache_dir=CACHE_DIR,
-        color_count=COLOR_COUNT, light=False):
-    """Get the colorscheme."""
+def generate(img, cache_dir=CACHE_DIR,
+             color_count=COLOR_COUNT, light=False,
+             backend="wal"):
+    """Generate a palette."""
     # home_dylan_img_jpg_1.2.2.json
     color_type = "light" if light else "dark"
     cache_file = re.sub("[/|\\|.]", "_", img)
@@ -118,8 +34,8 @@ def get(img, cache_dir=CACHE_DIR,
     else:
         print("wal: Generating a colorscheme...")
 
-        colors = gen_colors(img, color_count)
-        colors = create_palette(img, colors, light)
+        backend = get(backend)
+        colors = backend(img, color_count, light)
 
         util.save_file_json(colors, cache_file)
         print("wal: Generation complete.")