Add note and notes constructor (#163)

* add note constructor.

* use string to initialize Notes

CHANGELOG.md

@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+# v2.5.0
+* Implement `Note(pitch_name::String; position = 0, velocity = 100, duration = 960, channel = 0)`
+* Implement `Notes(notes_string::String, tpq::Int = 960)`
 # v2.4.0
 * Implement `Base.empty!(::Notes)` and `Base.isempty(::Notes)`.
 # v2.3.0

Project.toml

@@ -1,7 +1,7 @@
 name = "MIDI"
 uuid = "f57c4921-e30c-5f49-b073-3f2f2ada663e"
 repo = "https://github.com/JuliaMusic/MIDI.jl.git"
-version = "2.4.0"
+version = "2.5.0"
 
 [deps]
 FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"

src/note.jl

@@ -11,6 +11,7 @@ If the `channel` of the note is `0` (default), it is not shown.
 You can also create a `Note` with the following keyword constructor:
 ```julia
 Note(pitch, position; velocity = 100, duration = 960, channel = 0)
+Note(pitch_name::String; position = 0, velocity = 100, duration = 960, channel = 0)
 ```
 
 ## Fields:
@@ -41,6 +42,8 @@ mutable struct Note <: AbstractNote
 end
 Note(pitch, position; velocity = 100, duration = 960, channel = 0) =
 Note(pitch, velocity, position, duration, channel)
+Note(pitch_name::String; position = 0, velocity = 100, duration = 960, channel = 0) = 
+    Note(name_to_pitch(pitch_name), velocity, position, duration, channel)
 
 @inline Note(n::Note) = n
 
@@ -69,9 +72,16 @@ N(n.pitch, n.velocity, n.position, n.duration, n.channel)
 
 """
     Notes(note_vector, tpq = 960) -> Notes
+    Notes(notes_string::String, tpq::Int = 960) -> Notes
 A data structure describing a collection of music notes, bundled with the ticks
 per quarter note (so that the notes can be attributed rhythmic value).
 
+Notes can be initialized by string, the name of notes are separated by spaces.
+
+```julia
+Notes("C2 F3 D#6")
+```
+
 `Notes` can be iterated and accessed as the given `note_vector`.
 This eliminates the need for custom iteration or search functions.
 For example, to get the note of maximum pitch you can do:
@@ -94,6 +104,7 @@ function Notes(notes::Vector{N}, tpq::Int = 960) where {N <: AbstractNote}
 end
 
 Notes(; tpq = 960) = Notes{Note}(Vector{Note}[], tpq)
+Notes(notes_string::String, tpq::Int = 960) = Notes([Note(String(s)) for s in split(notes_string," ")], tpq)
 
 # Iterator Interface for notes:
 Base.iterate(n::Notes, i = 1) = iterate(n.notes, i)

test/note.jl

@@ -10,6 +10,16 @@ cd(@__DIR__)
     @test typeof(notes[1:3]) == Notes{Note}
     @test typeof(notes[1:3]) <: Notes
     @test notes[1:3].notes == notes.notes[1:3]
+
+    notes2 = Notes("C2 F3 D#6")
+    @test notes2[1].pitch == name_to_pitch("C2")
+    @test notes2[2].pitch == name_to_pitch("F3")
+    @test notes2[3].pitch == name_to_pitch("D#6")
+end
+
+@testset "Note" begin
+    c4 = Note("C4")
+    @test c4.pitch == name_to_pitch("C4")
 end
 
 @testset "pitch names" begin