Merge remote-tracking branch 'origin/main'

# Conflicts:
#	poetry.lock
#	pyproject.toml

akarpov/files/services/preview.py

@@ -0,0 +1,80 @@
+from math import ceil
+
+from PIL import Image, ImageDraw, ImageFont
+from preview_generator.manager import PreviewManager
+
+cache_path = "/tmp/preview_cache"
+PIL_GRAYSCALE = "L"
+PIL_WIDTH_INDEX = 0
+PIL_HEIGHT_INDEX = 1
+COMMON_MONO_FONT_FILENAMES = [
+    "DejaVuSansMono.ttf",
+    "Consolas Mono.ttf",
+    "Consola.ttf",
+]
+
+
+def textfile_to_image(textfile_path) -> Image:
+    """Convert text file to a grayscale image.
+
+    arguments:
+    textfile_path - the content of this file will be converted to an image
+    font_path - path to a font file (for example impact.ttf)
+    """
+    # parse the file into lines stripped of whitespace on the right side
+    with open(textfile_path) as f:
+        lines = tuple(line.rstrip() for line in f.readlines())
+
+    font = None
+    large_font = 20  # get better resolution with larger size
+    for font_filename in COMMON_MONO_FONT_FILENAMES:
+        try:
+            font = ImageFont.truetype(font_filename, size=large_font)
+            print(f'Using font "{font_filename}".')
+            break
+        except OSError:
+            print(f'Could not load font "{font_filename}".')
+    if font is None:
+        font = ImageFont.load_default()
+        print("Using default font.")
+
+    def _font_points_to_pixels(pt):
+        return round(pt * 96.0 / 72)
+
+    margin_pixels = 20
+
+    # height of the background image
+    tallest_line = max(lines, key=lambda line: font.getsize(line)[PIL_HEIGHT_INDEX])
+    max_line_height = _font_points_to_pixels(
+        font.getsize(tallest_line)[PIL_HEIGHT_INDEX]
+    )
+    realistic_line_height = max_line_height * 0.8
+    image_height = int(ceil(realistic_line_height * len(lines) + 2 * margin_pixels))
+
+    widest_line = max(lines, key=lambda s: font.getsize(s)[PIL_WIDTH_INDEX])
+    max_line_width = _font_points_to_pixels(font.getsize(widest_line)[PIL_WIDTH_INDEX])
+    image_width = int(ceil(max_line_width + (2 * margin_pixels)))
+
+    # draw the background
+    background_color = 255  # white
+    image = Image.new(
+        PIL_GRAYSCALE, (image_width, image_height), color=background_color
+    )
+    draw = ImageDraw.Draw(image)
+
+    font_color = 0
+    horizontal_position = margin_pixels
+    for i, line in enumerate(lines):
+        vertical_position = int(round(margin_pixels + (i * realistic_line_height)))
+        draw.text(
+            (horizontal_position, vertical_position), line, fill=font_color, font=font
+        )
+
+    return image
+
+
+def create_preview(file_path: str) -> str:
+    # TODO: add text image generation/code image
+    manager = PreviewManager(cache_path, create_folder=True)
+    path_to_preview_image = manager.get_jpeg_preview(file_path)
+    return path_to_preview_image