add paged song search command

miyu_bot/commands/cogs/music.py

@@ -14,7 +14,7 @@ from main import asset_manager
 from miyu_bot.commands.common.emoji import difficulty_emoji_ids
 from miyu_bot.commands.common.formatting import format_info
 from miyu_bot.commands.common.fuzzy_matching import romanize, FuzzyMap
-from miyu_bot.commands.common.reaction_message import run_tabbed_message
+from miyu_bot.commands.common.reaction_message import run_tabbed_message, run_paged_message
 
 
 class Music(commands.Cog):
@@ -145,12 +145,24 @@ class Music(commands.Cog):
         asyncio.ensure_future(run_tabbed_message(ctx, message, self.reaction_emojis, embeds))
 
     @commands.command(name='songs',
-                      aliases=['search_songs'],
+                      aliases=['songsearch', 'song_search'],
                       description='Finds songs matching the given name.',
                       help='!songs grgr')
-    async def songs(self, ctx: commands.Context, *, arg: str):
+    async def songs(self, ctx: commands.Context, *, arg: str = ""):
-        self.logger.info(f'Searching for songs sections "{arg}".')
+        if arg:
+            self.logger.info(f'Searching for songs "{arg}".')
             songs = self.music.get_sorted(arg)
+            listing = [f'{song.name}{" (" + song.special_unit_name + ")" if song.special_unit_name else ""}' for song in
+                       songs]
+            asyncio.ensure_future(run_paged_message(ctx, f'Song Search "{arg}"', listing))
+        else:
+            self.logger.info('Listing songs.')
+            songs = sorted(self.music.values(), key=lambda m: -m.default_order)
+            songs = [*songs[1:], songs[0]]  # lesson is always first
+            listing = [f'{song.name}{" (" + song.special_unit_name + ")" if song.special_unit_name else ""}' for song in
+                       songs]
+            asyncio.ensure_future(run_paged_message(ctx, f'All Songs', listing))
+
         return
 
     def get_chart_embed_info(self, song):

miyu_bot/commands/common/reaction_message.py

@@ -1,10 +1,12 @@
 import asyncio
-from typing import List, Callable, Awaitable
+from typing import List, Callable, Awaitable, Union, Optional
 
 import discord
-from discord import Message, Embed, Emoji
+from discord import Message, Embed, Emoji, PartialEmoji
 from discord.ext.commands import Context
 
+AnyEmoji = Union[str, Emoji]
+
 
 async def run_tabbed_message(ctx: Context, message: Message, emojis: List[Emoji], embeds: List[Embed], timeout=300):
     async def callback(emoji, _ctx, _message):
@@ -13,8 +15,65 @@ async def run_tabbed_message(ctx: Context, message: Message, emojis: List[Emoji]
     await run_reaction_message(ctx, message, emojis, callback, timeout)
 
 
-async def run_reaction_message(ctx: Context, message: Message, emojis: List[Emoji],
+async def run_paged_message(ctx: Context, title: str, content: List[str], page_size: int = 15,
-                               callback: Callable[[Emoji, Context, Message], Awaitable[None]], timeout=300):
+                            timeout=300, double_arrow_threshold=4):
+    if not content:
+        embed = discord.Embed(title=title).set_footer(text='Page 0/0')
+        await ctx.send(embed=embed)
+        return
+
+    page_contents = [content[i:i + page_size] for i in range(0, len(content), page_size)]
+
+    item_number = 0
+
+    def format_item(item):
+        nonlocal item_number
+        item_number += 1
+        return f'{item_number}. {item}'
+
+    embeds = [
+        discord.Embed(title=title, description='\n'.join((format_item(i) for i in page))).set_footer(
+            text=f'Page {i + 1}/{len(page_contents)}')
+        for i, page in enumerate(page_contents)]
+
+    message = await ctx.send(embed=embeds[0])
+
+    if len(embeds) == 1:
+        return
+
+    double_left_arrow = '⏪'
+    double_right_arrow = '⏩'
+    left_arrow = '◀'
+    right_arrow = '▶'
+
+    if 0 < double_arrow_threshold <= len(embeds):
+        arrows = [double_left_arrow, left_arrow, right_arrow, double_right_arrow]
+    else:
+        arrows = [left_arrow, right_arrow]
+
+    index = 0
+
+    async def callback(emoji, _ctx, _message):
+        nonlocal index
+        start_index = index
+        if emoji == double_left_arrow:
+            index = 0
+        elif emoji == left_arrow:
+            index -= 1
+        elif emoji == right_arrow:
+            index += 1
+        elif emoji == double_right_arrow:
+            index = len(embeds) - 1
+        index = min(len(embeds) - 1, max(0, index))
+
+        if index != start_index:
+            await message.edit(embed=embeds[index])
+
+    await run_reaction_message(ctx, message, arrows, callback, timeout)
+
+
+async def run_reaction_message(ctx: Context, message: Message, emojis: List[AnyEmoji],
+                               callback: Callable[[AnyEmoji, Context, Message], Awaitable[None]], timeout=300):
     for emoji in emojis:
         await message.add_reaction(emoji)
 
@@ -28,5 +87,5 @@ async def run_reaction_message(ctx: Context, message: Message, emojis: List[Emoj
             await message.remove_reaction(reaction, user)
         except asyncio.TimeoutError:
             for emoji in emojis:
-                await message.remove_reaction(ctx.bot.get_emoji(emoji), ctx.bot.user)
+                await message.remove_reaction(emoji, ctx.bot.user)
             break