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LICENSE

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

+ 542 - 0
slidegen.py

@@ -0,0 +1,542 @@
+"""
+Copyright © 2022 Noah Vogt <noah@noahvogt.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+from os import name, path
+from abc import ABC, abstractmethod
+from sys import argv, exit
+from termcolor import colored
+import colorama
+
+from wand.image import Image
+from wand.color import Color
+from wand.display import display
+from wand.drawing import Drawing
+from wand.font import Font
+
+IMAGE_FORMAT = "jpeg"
+FILE_EXTENSION = "jpg"
+FILE_NAMEING = "folie"
+
+WIDTH = 1920
+HEIGHT = 1080
+BG_COLOR = Color("white")
+FG_COLOR = Color("#6298a4")
+
+TITLE_COLOR = Color("#d8d5c4")
+MAX_TITLE_FONT_SIZE = 70
+MIN_TITLE_FONT_SIZE = 20
+TITLE_FONT_SIZE_STEP = 10
+TITLE_HEIGHT = 160
+TITLEBAR_Y = 65
+
+INFODISPLAY_FONT_SIZE = 25
+INFODISPLAY_ITEM_WIDTH = 20
+
+PLAYER_WIDTH = 560
+PLAYER_HEIGHT = 315
+
+BOLD_FONT_PATH = (
+    "/usr/share/fonts/TTF/century-gothic/CenturyGothicBold.ttf"
+    if name == "posix"
+    else "winPATH"
+)
+FONT_PATH = (
+    "/usr/share/fonts/TTF/century-gothic/CenturyGothic.ttf"
+    if name == "posix"
+    else "winPATH"
+)
+FONT = "Century-Gothic"
+BOLD_FONT = "Century-Gothic-Bold"
+
+TRIANGLE_WIDTH = 80
+TRIANGLE_HEIGTH = 160
+
+METADATA_FONT_SIZE = 36
+METADATA_X = 70
+BOOK_Y = 260
+ATTRIBUTIONS_Y = 930
+
+TEXT_COLOR = Color("black")
+
+VERSE_X = 80
+VERSE_Y = 400
+TEXT_CANVAS_X = 160
+TEXT_CANVAS_Y = 400
+TEXT_CANVAS_WIDTH = 1600
+TEXT_CANVAS_HEIGHT = 600
+STRUCTURE_X = 1650
+STRUCTURE_Y = 1000
+MAX_CANVAS_FONT_SIZE = 55
+MIN_CANVAS_FONT_SIZE = 35
+CANVAS_FONT_SIZE_STEP = 5
+INTERLINE_SPACING = 30
+
+METADATA_STRINGS = ("title", "book", "text", "melody", "structure")
+
+
+def error_msg(msg: str):
+    print(colored("[*] Error: {}".format(msg), "red"))
+    exit(1)
+
+
+def log(message: str):
+    print(colored("[*] {}".format(message), "green"))
+
+
+def get_empty_image() -> Image:
+    img = Image(width=1, height=1, background=Color("white"))
+    return img.clone()
+
+
+def strip_whitespace_list_entries(input_list: list):
+    return [entry for entry in input_list if entry.strip()]
+
+
+def structure_as_list(structure: str) -> list:
+    return structure.replace(" ", "").split(",")
+
+
+def get_unique_structure_elements(structure: list) -> list:
+    return list(dict.fromkeys(structure))
+
+
+def get_songtext_by_structure(content: list, structure: str) -> str:
+    found_desired_structure = False
+    output_str = ""
+
+    for line in content:
+        stripped_line = line.strip()
+        if found_desired_structure:
+            if stripped_line.startswith("[") and stripped_line.endswith("]"):
+                break
+            output_str += stripped_line + "\n"
+
+        if (
+            stripped_line.startswith("[")
+            and stripped_line.endswith("]")
+            and structure in stripped_line
+        ):
+            found_desired_structure = True
+
+    return output_str[:-1]
+
+
+class SongTemplate(ABC):
+    @abstractmethod
+    def get_template(self, title: str) -> Image:
+        pass
+
+
+class StartSlide(ABC):
+    @abstractmethod
+    def get_slide(
+        self,
+        template_img: Image,
+        book: str,
+        text_author: str,
+        melody_author: str,
+    ):
+        pass
+
+
+class SongSlide(ABC):
+    @abstractmethod
+    def get_slide(
+        self,
+        template_img: Image,
+        slide_text: str,
+        song_structure: list,
+        index: int,
+    ):
+        pass
+
+
+class ClassicSongSlide(SongSlide):
+    def get_slide(
+        self,
+        template_img: Image,
+        slide_text: str,
+        song_structure: list,
+        index: int,
+    ):
+        canvas_img, font_size = self.get_text_canvas(slide_text)
+        verse_or_chorus = song_structure[index]
+        bg_img = template_img.clone()
+        if "R" not in verse_or_chorus:
+            bg_img.composite(
+                self.get_index(verse_or_chorus, font_size),
+                top=VERSE_Y,
+                left=VERSE_X,
+            )
+        bg_img.composite(canvas_img, top=TEXT_CANVAS_Y, left=TEXT_CANVAS_X)
+        bg_img.composite(
+            self.get_structure_info_display(song_structure, index),
+            top=STRUCTURE_Y,
+            left=STRUCTURE_X,
+        )
+        return bg_img
+
+    def get_text_canvas(self, slide_text: str) -> tuple:
+        font_size = MAX_CANVAS_FONT_SIZE
+        while font_size >= MIN_CANVAS_FONT_SIZE:
+            with Drawing() as draw:
+                draw.fill_color = TEXT_COLOR
+                draw.text_interline_spacing = INTERLINE_SPACING
+                draw.font_size = font_size
+                draw.font = FONT
+                draw.text(0, font_size, slide_text)
+                with Image(
+                    width=WIDTH, height=HEIGHT, background=BG_COLOR
+                ) as img:
+                    draw(img)
+                    img.trim()
+                    if (
+                        img.width > TEXT_CANVAS_WIDTH
+                        or img.height > TEXT_CANVAS_HEIGHT
+                    ):
+                        font_size -= CANVAS_FONT_SIZE_STEP
+                        display(img)
+                    else:
+                        return img.clone(), font_size
+        return get_empty_image(), 0
+
+    def get_structure_info_display(self, structure: list, index: int) -> Image:
+        with Drawing() as draw:
+            draw.fill_color = TEXT_COLOR
+            draw.font_size = INFODISPLAY_FONT_SIZE
+            draw.font = FONT
+            for current_index, item in enumerate(structure):
+                if current_index == index:
+                    draw.font = BOLD_FONT
+                    draw.text(
+                        current_index * INFODISPLAY_ITEM_WIDTH,
+                        INFODISPLAY_FONT_SIZE,
+                        item,
+                    )
+                    draw.font = FONT
+                else:
+                    draw.text(
+                        current_index * INFODISPLAY_ITEM_WIDTH,
+                        INFODISPLAY_FONT_SIZE,
+                        item,
+                    )
+            with Image(width=WIDTH, height=HEIGHT, background=BG_COLOR) as img:
+                draw(img)
+                img.trim()
+
+                return img.clone()
+
+    def get_index(self, verse: str, font_size: int) -> Image:
+        with Image(width=WIDTH, height=HEIGHT, background=BG_COLOR) as img:
+            img.caption(
+                verse + ".",
+                font=Font(FONT_PATH, size=font_size, color=TEXT_COLOR),
+            )
+            img.trim()
+            return img.clone()
+
+
+class ClassicStartSlide(StartSlide):
+    def get_slide(
+        self,
+        template_img: Image,
+        book: str,
+        text_author: str,
+        melody_author: str,
+    ):
+        start_img = template_img.clone()
+        start_img.composite(
+            self.get_attributions(text_author, melody_author),
+            left=METADATA_X,
+            top=ATTRIBUTIONS_Y,
+        )
+        start_img.composite(self.get_book(book), left=METADATA_X, top=BOOK_Y)
+        return start_img.clone()
+
+    def get_metadata(self, text: str) -> Image:
+        with Image(width=WIDTH, height=HEIGHT, background=BG_COLOR) as img:
+            img.caption(
+                text,
+                font=Font(FONT_PATH, size=METADATA_FONT_SIZE, color=TEXT_COLOR),
+            )
+            img.trim()
+            return img.clone()
+
+    def get_attributions(self, text_author: str, melody_author: str) -> Image:
+        if text_author == melody_author:
+            return self.get_metadata("Text & Melodie: " + text_author)
+        return self.get_metadata(
+            "Text: " + text_author + "\nMelodie: " + melody_author
+        )
+
+    def get_book(self, book: str) -> Image:
+        return self.get_metadata(book)
+
+
+class ClassicSongTemplate(SongTemplate):
+    def __init__(self):
+        self.song_template = ""
+
+    def get_base_image(self) -> Image:
+        with Image(width=WIDTH, height=HEIGHT, background=BG_COLOR) as img:
+            return img.clone()
+
+    def get_titlebar_rectangle(self, text: str) -> Image:
+        font_size = MAX_TITLE_FONT_SIZE
+        while font_size >= MIN_TITLE_FONT_SIZE:
+            with Image(
+                width=WIDTH, height=TITLE_HEIGHT, background=FG_COLOR
+            ) as img:
+                img.caption(
+                    text,
+                    font=Font(
+                        BOLD_FONT_PATH, size=font_size, color=TITLE_COLOR
+                    ),
+                )
+                img.trim()
+                img.border(color=FG_COLOR, width=30, height=0)
+                trimmed_img_width = img.width
+                trimmed_img_height = img.height
+                concat_height = int((TITLE_HEIGHT - trimmed_img_height) / 2)
+                correction_heigt = (
+                    TRIANGLE_HEIGTH - trimmed_img_height - (2 * concat_height)
+                )
+                concatenated_img = Image(
+                    width=trimmed_img_width,
+                    height=concat_height,
+                    background=FG_COLOR,
+                )
+                concatenated_img.sequence.append(img)
+                concatenated_img.sequence.append(
+                    Image(
+                        width=trimmed_img_width,
+                        height=concat_height + correction_heigt,
+                        background=FG_COLOR,
+                    )
+                )
+                concatenated_img.concat(stacked=True)
+                if concatenated_img.width > (
+                    WIDTH - PLAYER_WIDTH - TRIANGLE_WIDTH
+                ):
+                    font_size -= TITLE_FONT_SIZE_STEP
+                    continue
+
+                return concatenated_img.clone()
+        return get_empty_image()
+
+    def get_template(self, title: str) -> Image:
+        titlebar_rectangle = self.get_titlebar_rectangle(title)
+        titlebar_rectangle.sequence.append(self.get_titlebar_triangle())
+        titlebar_rectangle.concat(stacked=False)
+        base_img = self.get_base_image()
+        base_img.composite(titlebar_rectangle, top=TITLEBAR_Y)
+        self.song_template = base_img.clone()
+        return base_img.clone()
+
+    def get_titlebar_triangle(self) -> Image:
+        with Drawing() as draw:
+            draw.fill_color = FG_COLOR
+            draw.path_start()
+            draw.path_move(to=(TRIANGLE_WIDTH, 0))
+            draw.path_line(to=(0, 0))
+            draw.path_line(to=(0, TRIANGLE_HEIGTH))
+            draw.path_close()
+            draw.path_finish()
+
+            with Image(
+                width=TRIANGLE_WIDTH,
+                height=TRIANGLE_HEIGTH,
+                background=BG_COLOR,
+            ) as img:
+                draw(img)
+                return img.clone()
+
+    def display(self):
+        display(self.song_template)
+
+
+class Slidegen:
+    def __init__(self, song_template_form, start_slide_form, song_slide_form):
+        self.metadata: dict = {"": ""}
+        self.songtext: dict = {"": ""}
+        self.song_file_path: str = ""
+        self.song_file_content: list = []
+        self.output_dir: str = ""
+        self.chosen_structure: list | str = ""
+        self.generated_slides: list = []
+        self.song_template_form = song_template_form
+        self.start_slide_form = start_slide_form
+        self.song_slide_form = song_slide_form
+        self.parse_argv()
+
+    def execute(self):
+        self.parse_file()
+        self.calculate_desired_structures()
+        self.generate_slides()
+
+    def generate_slides(self):
+        song_template = self.song_template_form()
+        log("generating template...")
+        template_img = song_template.get_template(self.metadata["title"])
+
+        first_slide = self.start_slide_form()
+        log("generating start slide...")
+        start_slide_img = first_slide.get_slide(
+            template_img,
+            self.metadata["book"],
+            self.metadata["text"],
+            self.metadata["melody"],
+        )
+        start_slide_img.format = IMAGE_FORMAT
+        start_slide_img.save(
+            filename=path.join(
+                self.output_dir, FILE_NAMEING + "1." + FILE_EXTENSION
+            )
+        )
+        log("generating song slides...")
+        for index, structure in enumerate(self.chosen_structure):
+            log(
+                "generating song slide [{} / {}]...".format(
+                    index + 1, len(self.chosen_structure)
+                )
+            )
+            song_slide = self.song_slide_form()
+            song_slide_img = song_slide.get_slide(
+                template_img,
+                self.songtext[structure],
+                self.chosen_structure,
+                index,
+            )
+            song_slide_img.format = IMAGE_FORMAT
+            song_slide_img.save(
+                filename=path.join(
+                    self.output_dir,
+                    FILE_NAMEING + str(index + 2) + "." + FILE_EXTENSION,
+                )
+            )
+
+    def parse_file(self):
+        self.parse_metadata()
+        self.parse_songtext()
+
+    def parse_metadata(self):
+        metadata_dict = dict.fromkeys(METADATA_STRINGS)
+        with open(self.song_file_path, mode="r", encoding="utf8") as opener:
+            content = strip_whitespace_list_entries(opener.readlines())
+        valid_metadata_strings = list(METADATA_STRINGS)
+
+        for line_nr, line in enumerate(content):
+            if len(valid_metadata_strings) == 0:
+                content = content[line_nr:]
+                break
+            metadata_str = line[: line.index(":")]
+            if metadata_str in valid_metadata_strings:
+                metadata_dict[metadata_str] = line[line.index(": ") + 2 : -1]
+                valid_metadata_strings.remove(metadata_str)
+                continue
+
+            error_msg("invalid metadata string '{}'".format(metadata_str))
+
+        self.metadata = metadata_dict
+        self.song_file_content = content
+
+    def parse_songtext(self):
+        unique_structures = get_unique_structure_elements(
+            structure_as_list(self.metadata["structure"])
+        )
+        output_dict = dict.fromkeys(unique_structures)
+
+        for structure in unique_structures:
+            output_dict[structure] = get_songtext_by_structure(
+                self.song_file_content, structure
+            )
+
+        self.songtext = output_dict
+
+    def calculate_desired_structures(self):
+        full_structure_str = str(self.metadata["structure"])
+        full_structure_list = structure_as_list(full_structure_str)
+        if len(self.chosen_structure) == 0:
+            self.chosen_structure = structure_as_list(full_structure_str)
+            log("chosen structure: {}".format(str(self.chosen_structure)))
+            return
+        if not "-" in self.chosen_structure:
+            self.chosen_structure = structure_as_list(
+                str(self.chosen_structure)
+            )
+            log("chosen structure: {}".format(str(self.chosen_structure)))
+            return
+
+        dash_index = str(self.chosen_structure).find("-")
+        start_verse = str(self.chosen_structure[:dash_index]).strip()
+        end_verse = str(self.chosen_structure[dash_index + 1 :]).strip()
+
+        try:
+            if int(start_verse) >= int(end_verse):
+                error_msg("{} < {} must be true".format(start_verse, end_verse))
+            if start_verse not in full_structure_str:
+                error_msg("structure {} unknown".format(start_verse))
+            if end_verse not in full_structure_str:
+                error_msg("structure {} unknown".format(end_verse))
+        except (ValueError, IndexError):
+            error_msg("please choose a valid integer for the song structure")
+
+        start_index = full_structure_list.index(start_verse)
+        if start_index != 0:
+            if (
+                full_structure_list[0] == "R"
+                and full_structure_list[start_index - 1] == "R"
+            ):
+                start_index -= 1
+        end_index = full_structure_list.index(end_verse)
+        if end_index != len(full_structure_list) - 1:
+            if (
+                full_structure_list[-1] == "R"
+                and full_structure_list[end_index + 1] == "R"
+            ):
+                end_index += 1
+
+        self.chosen_structure = full_structure_list[start_index : end_index + 1]
+        log("chosen structure: {}".format(str(self.chosen_structure)))
+
+    def parse_argv(self):
+        try:
+            self.song_file_path = argv[1]
+            self.output_dir = argv[2]
+        except IndexError:
+            error_msg("no arguments provided, exiting...")
+        try:
+            self.chosen_structure = argv[3]
+            if self.chosen_structure.strip() == "":
+                self.chosen_structure = ""
+        except IndexError:
+            self.chosen_structure = ""
+
+        log("parsing {}...".format(self.song_file_path))
+
+
+def main():
+    colorama.init()
+
+    slidegen = Slidegen(
+        ClassicSongTemplate, ClassicStartSlide, ClassicSongSlide
+    )
+    slidegen.execute()
+
+
+if __name__ == "__main__":
+    main()

+ 20 - 0
template.txt

@@ -0,0 +1,20 @@
+title: <++>
+book: <++>
+text: <++>
+melody: <++>
+structure: <++>
+
+[R]
+<++>
+
+[1]
+<++>
+
+[2]
+<++>
+
+[3]
+<++>
+
+[4]
+<++>