add gainlayer command group

add GainlayerHelpFormatter

src/vban_cli/gainlayer.py

@@ -0,0 +1,51 @@
+from typing import Annotated
+
+from cyclopts import App, Argument, Parameter
+
+from . import console
+from .context import Context
+from .help import GainlayerHelpFormatter
+
+app = App(name='gainlayer', help_formatter=GainlayerHelpFormatter())
+
+
+@app.meta.default
+def launcher(
+    gainlayer_index: Annotated[int, Argument()] = None,
+    *tokens: Annotated[str, Parameter(show=False, allow_leading_hyphen=True)],
+    index: Annotated[int, Argument()] = None,
+    ctx: Annotated[Context, Parameter(show=False)] = None,
+):
+    """Control the gainlayers."""
+    additional_kwargs = {}
+    command, bound, _ = app.parse_args(tokens)
+    if index is not None and gainlayer_index is not None:
+        additional_kwargs['strip_index'] = index
+        additional_kwargs['gainlayer_index'] = gainlayer_index
+    else:
+        raise ValueError('Both gainlayer_index and index must be provided.')
+    if ctx is not None:
+        additional_kwargs['ctx'] = ctx
+
+    return command(*bound.args, **bound.kwargs, **additional_kwargs)
+
+
+@app.command(name='level')
+def level(
+    new_level: Annotated[float, Argument()] = None,
+    *,
+    strip_index: Annotated[int, Parameter(show=False)] = None,
+    gainlayer_index: Annotated[int, Parameter(show=False)] = None,
+    ctx: Annotated[Context, Parameter(show=False)] = None,
+):
+    """Get or set the level of the specified gainlayer.
+
+    Parameters
+    ----------
+    new_level : float
+        If provided, sets the level to this value. If not provided, the current level is printed.
+    """
+    if new_level is None:
+        console.out.print(ctx.client.strip[strip_index].gainlayer[gainlayer_index].gain)
+        return
+    ctx.client.strip[strip_index].gainlayer[gainlayer_index].gain = new_level

src/vban_cli/help.py

@@ -95,6 +95,22 @@ class EqHelpFormatter(BaseHelpFormatter):
             console.print(f'[bold]Usage:[/bold] {modified_usage}')
 
 
+class GainlayerHelpFormatter(BaseHelpFormatter):
+    """Help formatter for gainlayer commands that works with strip commands.
+
+    Injects <index> after 'strip' and <gainlayer_index> after 'gainlayer'."""
+
+    def render_usage(self, console: Console, options: ConsoleOptions, usage) -> None:
+        """Render the usage line with proper <index> placement for strip commands."""
+        if usage:
+            modified_usage = re.sub(
+                r'(\S+\s+strip)(\s+gainlayer\s+)(COMMAND)',
+                r'\1 <index>\2<[cyan]gainlayer_index[/cyan]> \3',
+                str(usage),
+            )
+            console.print(f'[bold]Usage:[/bold] {modified_usage}')
+
+
 class CellHelpFormatter(BaseHelpFormatter):
     """Help formatter for cell commands that works with both strip and bus commands.
 
@@ -105,7 +121,7 @@ class CellHelpFormatter(BaseHelpFormatter):
         if usage:
             modified_usage = re.sub(
                 r'(\S+\s+)(\w+)(\s+eq\s+cell\s+)(COMMAND)',
-                r'\1\2 <index>\3<band> \4',
+                r'\1\2 <index>\3<[cyan]band[/cyan]> \4',
                 str(usage),
             )
             console.print(f'[bold]Usage:[/bold] {modified_usage}')

src/vban_cli/strip.py

@@ -2,7 +2,7 @@ from typing import Annotated, Optional
 
 from cyclopts import App, Argument, Parameter
 
-from . import comp, console, denoiser, eq, gate
+from . import comp, console, denoiser, eq, gainlayer, gate
 from .context import Context
 from .help import StripHelpFormatter
 
@@ -11,6 +11,7 @@ app.command(eq.app.meta, name='eq')
 app.command(comp.app.meta, name='comp')
 app.command(gate.app.meta, name='gate')
 app.command(denoiser.app.meta, name='denoiser')
+app.command(gainlayer.app.meta, name='gainlayer')
 
 
 @app.meta.default