backend: initial work to add more backends

2 files changed, 122 insertions, 0 deletions

diff --git a/pywal/backends/__init__.py b/pywal/backends/__init__.py
new file mode 100644
index 0000000..d1fed5d
--- /dev/null
+++ b/pywal/backends/__init__.py
@@ -0,0 +1,16 @@
+"""
+                                      '||
+... ...  .... ... ... ... ...  ....    ||
+ ||'  ||  '|.  |   ||  ||  |  '' .||   ||
+ ||    |   '|.|     ||| |||   .|' ||   ||
+ ||...'     '|       |   |    '|..'|' .||.
+ ||      .. |
+''''      ''
+Created by Dylan Araps.
+"""
+
+from . import wal
+
+__all__ = [
+    "wal",
+]
diff --git a/pywal/backends/wal.py b/pywal/backends/wal.py
new file mode 100644
index 0000000..14c4bff
--- /dev/null
+++ b/pywal/backends/wal.py
@@ -0,0 +1,106 @@
+"""
+Generate a colorscheme using imagemagick.
+"""
+import re
+import shutil
+import subprocess
+import sys
+
+from .. import util
+from ..settings import COLOR_COUNT
+
+
+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(img, color_count=COLOR_COUNT, light=False):
+    """Get colorscheme."""
+    colors = gen_colors(img, color_count)
+    return create_palette(img, colors, light)