Curry trix.

apps/api/Tasks/Update.ts

@@ -1,5 +1,5 @@
-import * as T from "@effect-ts/core/Effect"
-import { constant, identity } from "@effect-ts/core/Function"
+import { flow, identity } from "@effect-ts/core/Function"
+import * as T from "@effect-ts-app/core/ext/Effect"
 import * as O from "@effect-ts-app/core/ext/Option"
 import { handle } from "@effect-ts-app/infra/app"
 import { Tasks } from "@effect-ts-demo/todo-client"
@@ -27,7 +27,10 @@ export default handle(Tasks.Update)(({ id, myDay, ..._ }) =>
 
     // TODO: Context should perhaps know if changed, and should use a transaction
     yield* $(
-      T.tuple(whenChanged(Tasks.save_)(nt, task), whenChanged(Users.save)(nu, user))
+      T.tuple(
+        Tasks.save_["|>"](T.ifDiff(nt, task)),
+        Users.save["|>"](T.ifDiff(nu, user))
+      )
     )
   })
 )
@@ -54,20 +57,12 @@ export function updateTask_(
       O.fold(
         // TODO: Attachment removed?
         () => t,
-        (a) =>
-          t["|>"](
-            Task.addAudit(
-              TaskAudits.TaskFileAdded.fromAttachment(a)({ userId: user.id })
-            )
-          )
+        flow(
+          TaskAudits.TaskFileAdded.fromAttachment({ userId: user.id }),
+          Task.addAuditR(t)
+        )
       )
     )
   }
   return [t, user] as const
 }
-
-function whenChanged<I, R, E, A>(f: (i: I) => T.Effect<R, E, A>) {
-  return (n: I, orig: I) => T.if(() => f(n), constUnit)(n !== orig)
-}
-
-const constUnit = constant(T.unit)

apps/api/_services/TodoContext.testdata.ts

@@ -18,7 +18,7 @@ import {
 
 function makeUserTaskCreator(u: User) {
   return flow(
-    User.createTask(u),
+    User.createTaskR(u),
     Task.lens["|>"](Lens.prop("title"))["|>"](
       Lens.modify((t) => reasonableStringUnsafe(`${u.name} - ${t}`))
     )
@@ -48,7 +48,7 @@ export function makeTestDataUnsafe() {
 
   const users = [patrick, mike, markus]
 
-  const createPatrickList = User.createTaskList(patrick)
+  const createPatrickList = User.createTaskListR(patrick)
   const patrickList = createPatrickList({
     title: reasonableStringUnsafe("Some Patrick List"),
   })

packages/core/ext/Effect.ts

@@ -5,15 +5,17 @@ import {
   effectAsyncInterrupt,
   fail,
   fromEither,
+  if_,
   IO,
   succeed,
   succeedWith,
   tap,
+  unit,
 } from "@effect-ts/core/Effect"
 import type * as Ei from "@effect-ts/core/Either"
 import * as O from "@effect-ts/core/Option"
 
-import { flow, Lazy, pipe } from "./Function"
+import { constant, flow, Lazy, pipe } from "./Function"
 
 export const encaseEither = <E, A>(ei: Ei.Either<E, A>) => fromEither(() => ei)
 export const chainEither = <E, A, A2>(ei: (a: A2) => Ei.Either<E, A>) =>
@@ -51,4 +53,18 @@ export function tupleCurriedTap<A, B, R, E, C>(f: (b: B) => (a: A) => Effect<R,
   return (t: readonly [A, B]) => succeed(t[0])["|>"](tap(f(t[1])))
 }
 
+export function ifDiffR<I, R, E, A>(f: (i: I) => Effect<R, E, A>) {
+  return (n: I, orig: I) => ifDiff_(n, orig, f)
+}
+
+export function ifDiff<I, R, E, A>(n: I, orig: I) {
+  return (f: (i: I) => Effect<R, E, A>) => ifDiff_(n, orig, f)
+}
+
+export function ifDiff_<I, R, E, A>(n: I, orig: I, f: (i: I) => Effect<R, E, A>) {
+  return if_(n !== orig, () => f(n), constUnit)
+}
+
+const constUnit = constant(unit)
+
 export * from "@effect-ts/core/Effect"

packages/core/ext/utils/index.ts

@@ -70,3 +70,19 @@ export function capitalize<T extends string>(string: T): Capitalize<T> {
 export function uncapitalize<T extends string>(string: T): Uncapitalize<T> {
   return (string.charAt(0).toLowerCase() + string.slice(1)) as Uncapitalize<T>
 }
+
+export function tupledCurry<A, B, C>(f: (b: B) => (a: A) => C) {
+  return (t: [A, B]) => f(t[1])(t[0])
+}
+
+export function reverseCurry<A, B, C>(f: (b: B) => (a: A) => C) {
+  return (a: A) => (b: B) => f(b)(a)
+}
+
+export function curry<A, B, C>(f: (a: A, b: B) => C) {
+  return (b: B) => (a: A) => f(a, b)
+}
+
+export function uncurry<A, B, C>(f: (b: B) => (a: A) => C) {
+  return (a: A, b: B) => f(b)(a)
+}

packages/types/Task/Task.ts

@@ -20,6 +20,7 @@ import {
   reasonableString,
   withDefault,
 } from "@effect-ts-app/core/ext/Schema"
+import { curry, reverseCurry, uncurry } from "@effect-ts-app/core/ext/utils"
 
 import { TaskId, TaskListIdU, UserId } from "../ids"
 import { TaskAudit, TaskCreated } from "./audit"
@@ -107,9 +108,8 @@ export class Task extends Model<Task>()({
 
   static addAudit = (audit: TaskAudit) =>
     Task.lens["|>"](Lens.prop("auditLog"))["|>"](Lens.modify(A.snoc(audit)))
-  static addAudit_ = (t: Task, audit: TaskAudit) => Task.addAudit(audit)(t)
-
-  static update = (_: OptionalEditableTaskProps) => (t: Task) => Task.update_(t, _)
+  static addAuditR = reverseCurry(Task.addAudit)
+  static addAudit_ = uncurry(Task.addAudit)
 
   static update_ = (t: Task, _: OptionalEditableTaskProps) => {
     const nt = {
@@ -119,4 +119,5 @@ export class Task extends Model<Task>()({
     }
     return nt
   }
+  static update = curry(Task.update_)
 }

packages/types/Task/audit.ts

@@ -1,3 +1,4 @@
+import { LazyGetter } from "@effect-ts/core/Utils"
 import {
   date,
   defaultProp,
@@ -11,6 +12,7 @@ import {
   union,
   UUID,
 } from "@effect-ts-app/core/ext/Schema"
+import { reverseCurry } from "@effect-ts-app/core/ext/utils"
 
 import { UserId } from "../ids"
 import { Attachment, FileName } from "./shared"
@@ -34,8 +36,12 @@ export class TaskFileAdded extends Model<TaskFileAdded>()({
   ...AuditProps("TaskFileAdded"),
   fileName: prop(FileName),
 }) {
-  static fromAttachment(a: Attachment) {
-    return partialConstructor_(TaskFileAdded, { fileName: a.fileName })
+  static fromAttachmentR = (a: Attachment) =>
+    partialConstructor_(TaskFileAdded, { fileName: a.fileName })
+
+  @LazyGetter()
+  static get fromAttachment() {
+    return reverseCurry(TaskFileAdded.fromAttachmentR)
   }
 }
 

packages/types/User.ts

@@ -1,12 +1,12 @@
 import * as A from "@effect-ts/core/Collections/Immutable/Array"
 import * as O from "@effect-ts/core/Option"
 import { Option } from "@effect-ts/core/Option"
+import { LazyGetter } from "@effect-ts/core/Utils"
 import {
   array,
   date,
   defaultProp,
   Email,
-  GetPartialConstructor,
   Model,
   namedC,
   ParsedShapeOf,
@@ -16,6 +16,7 @@ import {
   props,
   reasonableString,
 } from "@effect-ts-app/core/ext/Schema"
+import { reverseCurry, uncurry } from "@effect-ts-app/core/ext/utils"
 
 import { TaskId, UserId } from "./ids"
 import { Task } from "./Task"
@@ -37,32 +38,38 @@ export class User extends Model<User>()({
   myDay: defaultProp(array(MyDay)),
   phoneNumber: prop(PhoneNumber),
 }) {
-  static createTask__ =
-    (a: GetPartialConstructor<typeof User["createTask_"]>) => (u: User) =>
-      User.createTask_(u, a)
+  @LazyGetter()
+  static get createTask() {
+    return reverseCurry(User.createTaskR)
+  }
 
-  static createTask_ = (u: User, a: GetPartialConstructor<typeof User["createTask"]>) =>
-    User.createTask(u)(a)
-  static createTask = (u: User) => createPartialTask({ createdBy: u.id })
+  @LazyGetter()
+  static get createTask_() {
+    return uncurry(User.createTask)
+  }
+  static createTaskR = (u: User) => createPartialTask({ createdBy: u.id })
 
-  static createTaskList__ =
-    (a: GetPartialConstructor<typeof User["createTaskList_"]>) => (u: User) =>
-      User.createTaskList_(u, a)
+  @LazyGetter()
+  static get createTaskList() {
+    return reverseCurry(User.createTaskListR)
+  }
 
-  static createTaskList_ = (
-    u: User,
-    a: GetPartialConstructor<typeof User["createTaskList"]>
-  ) => User.createTaskList(u)(a)
-  static createTaskList = (u: User) => createPartialTaskList({ ownerId: u.id })
+  @LazyGetter()
+  static get createTaskList_() {
+    return uncurry(User.createTaskList)
+  }
+  static createTaskListR = (u: User) => createPartialTaskList({ ownerId: u.id })
 
-  static createTaskListGroup__ =
-    (a: GetPartialConstructor<typeof User["createTaskListGroup_"]>) => (u: User) =>
-      User.createTaskListGroup_(u, a)
-  static createTaskListGroup_ = (
-    u: User,
-    a: GetPartialConstructor<typeof User["createTaskListGroup"]>
-  ) => User.createTaskListGroup(u)(a)
-  static createTaskListGroup = (u: User) =>
+  @LazyGetter()
+  static get createTaskListGroup() {
+    return reverseCurry(User.createTaskListGroupR)
+  }
+
+  @LazyGetter()
+  static get createTaskListGroup_() {
+    return uncurry(User.createTaskListGroup)
+  }
+  static createTaskListGroupR = (u: User) =>
     createPartialTaskListGroup({ ownerId: u.id })
 
   static getMyDay = (t: Task) => (u: User) =>