Add fft() function

Pipfile

@@ -10,6 +10,7 @@ sounddevice = "*"
 soundfile = "*"
 numpy = "*"
 matplotlib = "*"
+tkinter = "*"
 
 [requires]
 python_version = "3.7"

smnp/module/synth/__init__.py

@@ -1,4 +1,4 @@
-from smnp.module.synth.function import synth, pause, plot, compile
+from smnp.module.synth.function import synth, pause, plot, compile, fft
 
-functions = [ synth.function, pause.function, plot.function, compile.function ]
+functions = [ synth.function, pause.function, plot.function, compile.function, fft.function ]
 methods = []

smnp/module/synth/function/fft.py

@@ -0,0 +1,17 @@
+import numpy as np
+
+from smnp.function.model import Function
+from smnp.function.signature import signature
+from smnp.type.model import Type
+from smnp.type.signature.matcher.list import listOf
+
+_signature = signature(listOf(Type.FLOAT))
+def _function(env, signal):
+    raw = [ x.value for x in signal.value ]
+    N = len(raw)
+    fft = np.fft.fft(raw)/N
+    fft = fft[range(int(N/2))]
+    return Type.list([ Type.float(float(abs(x))) for x in fft ])
+
+
+function = Function(_signature, _function, 'fft')

smnp/module/synth/function/plot.py

@@ -10,4 +10,4 @@ def _function(env, wave):
     plot(rawWave)
 
 
-function = Function(_signature, _function, 'plotWave')
+function = Function(_signature, _function, 'plot')