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Add Task.seq and Task.forEach #19

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Jun 29, 2024
Merged

Add Task.seq and Task.forEach #19

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14173e6
add seq and forEach to Task
lukewilliamboswell Jan 18, 2024
66dffb8
Update to latest version of basic-cli
Anton-4 Jun 28, 2024
40919f3
need to trigger CI
Anton-4 Jun 29, 2024
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4 changes: 2 additions & 2 deletions README.md
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Expand Up @@ -2,6 +2,8 @@

:eyes: examples: [0.4](https://github.com/roc-lang/basic-webserver/tree/0.4.0/examples), [0.3](https://github.com/roc-lang/basic-webserver/tree/0.3.0/examples), [0.2](https://github.com/roc-lang/basic-webserver/tree/0.2.0/examples), [0.1](https://github.com/roc-lang/basic-webserver/tree/0.1/examples)

:warning: On linux `--linker=legacy` is necessary for this package because of [this Roc issue](https://github.com/roc-lang/roc/issues/3609).

# Basic Web Server for [Roc](https://www.roc-lang.org/)

A webserver [platform](https://github.com/roc-lang/roc/wiki/Roc-concepts-explained#platform) with a simple interface.
Expand All @@ -10,8 +12,6 @@ Write a function which takes a `Http.Request`, perform I/O like fetching content

Behind the scenes, `basic-webserver` uses Rust's high-performance [hyper](https://hyper.rs) and [tokio](https://tokio.rs) libraries to execute your Roc function on incoming requests.

:warning: On linux `--linker=legacy` is necessary for this package because of [this Roc issue](https://github.com/roc-lang/roc/issues/3609).

## Example

Hello world webserver:
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38 changes: 38 additions & 0 deletions platform/Task.roc
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Expand Up @@ -13,6 +13,8 @@ module [
fromResult,
batch,
result,
sequence,
forEach,
]

import Effect
Expand Down Expand Up @@ -244,3 +246,39 @@ result = \task ->
\res -> res |> ok |> InternalTask.toEffect

InternalTask.fromEffect effect


## Apply each task in a list sequentially, and return a [Task] with the list of the resulting values.
## Each task will be awaited (see [Task.await]) before beginning the next task,
## execution will stop if an error occurs.
##
## ```
## fetchAuthorTasks : List (Task Author [DbError])
##
## getAuthors : Task (List Author) [DbError]
## getAuthors = Task.sequence fetchAuthorTasks
## ```
##
sequence : List (Task ok err) -> Task (List ok) err
sequence = \tasks ->
List.walk tasks (InternalTask.ok []) \state, task ->
value <- task |> await

state |> map \values -> List.append values value

## Apply a function that returns `Task {} _` for each item in a list.
## Each task will be awaited (see [Task.await]) before beginning the next task,
## execution will stop if an error occurs.
##
## ```
## authors : List Author
## saveAuthor : Author -> Task {} [DbError]
##
## saveAuthors : Task {} [DbError]
## saveAuthors = Task.forEach authors saveAuthor
## ```
##
forEach : List a, (a -> Task {} b) -> Task {} b
forEach = \items, fn ->
List.walk items (InternalTask.ok {}) \state, item ->
state |> await \_ -> fn item
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