alda.lisp.events — alda/core 0.5.0

Convenience functions for generating Alda events.

These functions comprise the event functions in the alda.lisp DSL.

apply-global-attributes clj

(apply-global-attributes)

For each instrument in :current-instruments, looks between the instrument's :last-offset and :current-offset and applies any attribute changes occurring within that window.

Both global and per-instrument attributes are applied; in the case that a per-instrument attribute is applied at the exact same time as a global attribute, the per-instrument attribute takes precedence for that instrument.

at-marker clj

(at-marker name)

Set the marker at which events will be added.

barline clj

(barline)

Barlines, at least currently, do nothing when evaluated in alda.lisp.

chord clj

(chord & events)

Causes every instrument in :current-instruments to play each note in the chord simultaneously at the instrument's :current-offset.

cram clj

(cram & events)

A cram expression evaluates the events it contains, time-scaled based on the inner tally of beats in the events and the outer durations of each current instrument.

end-voices clj

(end-voices)

By default, the score remains in 'voice mode' until it reaches an end-voices event. This is so that if an instrument part ends with a voice group, the same voices can be appended later if the part is resumed, e.g. when building a score gradually in the Alda REPL or in a Clojure process.

The end-voices event is emitted by the parser when it parses 'V0:'.

get-variable clj

(get-variable var-name)

Returns any number of events previously defined as a variable.

global-attribute clj

(global-attribute attr val)

Public fn for setting global attributes in a score. e.g. (global-attribute :tempo 100)

global-attributes clj

(global-attributes & attrs)

Convenience fn for setting multiple global attributes at once. e.g. (global-attributes :tempo 100 :volume 50)

marker clj

(marker name)

Places a marker at the current absolute offset. Throws an exception if there are multiple instruments active at different offsets.

note clj

(note pitch)

(note pitch x)

(note {:keys [letter accidentals]} {:keys [beats ms slurred]} slur?)

Causes every instrument in :current-instruments to play a note at its :current-offset for the specified duration.

If no duration is specified, the note is played for the instrument's own internal duration, which will be the duration last specified on a note or rest in that instrument's part.

part clj

(part instrument-call & events)

Determines the current instrument instance(s) based on the instrument-call and evaluates the events within that context.

instrument-call can either be a map containing :names and an optional :nickname (e.g. {:names ['piano' 'trumpet'] :nickname ['trumpiano']}) or a valid Alda instrument call string, e.g. 'piano/trumpet 'trumpiano''.

pause clj

(pause & [{:keys [beats ms] :as dur}])

Causes every instrument in :current-instruments to rest (not play) for the specified duration.

If no duration is specified, each instrument will rest for its own internal duration, which will be the duration last specified on a note or rest in that instrument's part.

set-attribute clj

(set-attribute attr val)

Public fn for setting attributes in a score. e.g. (set-attribute :tempo 100)

set-attributes clj

(set-attributes & attrs)

Convenience fn for setting multiple attributes at once. e.g. (set-attributes :tempo 100 :volume 50)

set-variable clj

(set-variable var-name & events)

Defines any number of events as a variable so that they can be referenced by name.

times clj

(times n event)

Repeats an Alda event (or sequence of events) n times. Also implements the alternate endings function. Takes as input a sequence of events optionally paired with which repetitions they play in. If no repetition position is specified for a certain event, then that event will play during all repetitions. e.g. (times 4 [[[1 3] note1] [[2] [note2 note3]] note4]) results in [[note1 note4] [note2 note3 note4] [note1 note4] [note4]]

voice clj

(voice voice-number & events)

One voice in a voice group.