Document where to find APIs

Resolves gleam-lang#27

CONTRIBUTING.md

@@ -0,0 +1,60 @@
+# How to Contribute
+
+## Adding a New API Function
+
+1. Figure out what you want to do
+    - Go to https://hexdocs.pm/hex/Mix.Tasks.Hex.html and find what you want to do
+2. Once you find the page, click on the code icon on the top-right to go to the corresponding source code like so: https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.owner.ex#L125
+```elixir
+  defp transfer_owner(organization, package, owner) do
+    auth = Mix.Tasks.Hex.auth_info(:write)
+    Hex.Shell.info("Transferring ownership to #{owner} for #{package}")
+
+    case Hex.API.Package.Owner.add(organization, package, owner, "full", true, auth) do
+      {:ok, {code, _body, _headers}} when code in 200..299 ->
+        :ok
+
+      other ->
+        Hex.Shell.error("Transferring ownership failed")
+        Hex.Utils.print_error_result(other)
+    end
+  end
+```
+
+3. The API function this is calling is `Hex.API.Package.Owner.add` so we go to https://github.com/hexpm/hex/blob/main/lib/hex/api/package.ex, scroll down to the defmodule for Owner and then find the `add` function:
+```elixir
+    def add(repo, package, owner, level, transfer, auth) when package != "" do
+      Hex.API.check_write_api()
+
+      owner = URI.encode_www_form(owner)
+      path = "packages/#{URI.encode(package)}/owners/#{URI.encode(owner)}"
+      params = %{level: level, transfer: transfer}
+      API.erlang_put_request(repo, path, params, auth)
+    end
+```
+`path` tells us what path and variables we will be using while `params` tells us what the body of the request should contain. The `API.erlang_put_request` at the bottom of this tells us the method of our request needs to be `PUT`. Now we have all of the information we need to create our request function like so:
+```elixir
+pub fn transfer_owner_request(
+    package_name: &str,
+    owner: &str,
+    api_key: &str,
+    config: &Config,
+) -> http::Request<Vec<u8>> {
+    let body = json!({
+        "level": OwnerLevel::Full.to_string(),
+        "transfer": true,
+    });
+
+    config
+        .api_request(
+            Method::PUT,
+            &format!("packages/{}/owners/{}", package_name, owner),
+            Some(api_key),
+        )
+        .body(body.to_string().into_bytes())
+        .expect("transfer_owner_request request")
+}
+```
+Note that the `api_key` and `config` fields will always be present in these request functions while the other fields are tailored to the specific request we want to make.
+
+4. TODO: How to figure out what to write for the response function?

src/lib.rs

@@ -88,6 +88,12 @@ fn make_request(
 }
 
 /// Create a request that creates a Hex API key.
+/// 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.ex#L137
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/key.ex#L6
 pub fn create_api_key_request(
     username: &str,
     password: &str,
@@ -125,6 +131,12 @@ pub fn create_api_key_response(response: http::Response<Vec<u8>>) -> Result<Stri
 }
 
 /// Create a request that deletes an Hex API key.
+/// 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.user.ex#L291
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/key.ex#L15
 pub fn remove_api_key_request(
     name_of_key_to_delete: &str,
     api_key: &str,
@@ -137,7 +149,7 @@ pub fn remove_api_key_request(
             Some(api_key),
         )
         .body(vec![])
-        .expect("get_package_tarball_request request")
+        .expect("remove_api_key_request request")
 }
 
 /// Parses a request that deleted a Hex API key.
@@ -152,6 +164,12 @@ pub fn remove_api_key_response(response: http::Response<Vec<u8>>) -> Result<(),
 }
 
 /// Retire an existing package release from Hex.
+/// 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.retire.ex#L75
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/release.ex#L28
 pub fn retire_release_request(
     package: &str,
     version: &str,
@@ -171,7 +189,7 @@ pub fn retire_release_request(
             Some(api_key),
         )
         .body(body.to_string().into_bytes())
-        .expect("require_release_request request")
+        .expect("retire_release_request request")
 }
 
 /// Parses a request that retired a release.
@@ -186,6 +204,12 @@ pub fn retire_release_response(response: http::Response<Vec<u8>>) -> Result<(),
 }
 
 /// Un-retire an existing retired package release from Hex.
+/// 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.retire.ex#L89
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/release.ex#L35
 pub fn unretire_release_request(
     package: &str,
     version: &str,
@@ -199,7 +223,7 @@ pub fn unretire_release_request(
             Some(api_key),
         )
         .body(vec![])
-        .expect("require_release_request request")
+        .expect("unretire_release_request request")
 }
 
 /// Parses a request that un-retired a package version.
@@ -215,7 +239,7 @@ pub fn unretire_release_response(response: http::Response<Vec<u8>>) -> Result<()
 
 /// Create a request that get the names and versions of all of the packages on
 /// the package registry.
-///
+/// TODO: Where are the API docs for this?
 pub fn get_repository_versions_request(
     api_key: Option<&str>,
     config: &Config,
@@ -224,7 +248,7 @@ pub fn get_repository_versions_request(
         .repository_request(Method::GET, "versions", api_key)
         .header("accept", "application/json")
         .body(vec![])
-        .expect("create_api_key_request request")
+        .expect("get_repository_versions_request request")
 }
 
 /// Parse a request that get the names and versions of all of the packages on
@@ -268,7 +292,12 @@ pub fn get_repository_versions_response(
 }
 
 /// Create a request to get the information for a package in the repository.
-///
+/// 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.package.ex#L348
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/package.ex#L36
 pub fn get_package_request(
     name: &str,
     api_key: Option<&str>,
@@ -321,7 +350,7 @@ pub fn get_package_response(
 }
 
 /// Create a request to download a version of a package as a tarball
-///
+/// TODO: Where are the API docs for this?
 pub fn get_package_tarball_request(
     name: &str,
     version: &str,
@@ -358,6 +387,11 @@ pub fn get_package_tarball_response(
     Ok(body)
 }
 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.publish.ex#L384
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/release_docs.ex#L19
 pub fn remove_docs_request(
     package_name: &str,
     version: &str,
@@ -373,7 +407,7 @@ pub fn remove_docs_request(
             Some(api_key),
         )
         .body(vec![])
-        .expect("get_package_tarball_request request"))
+        .expect("remove_docs_request request"))
 }
 
 pub fn remove_docs_response(response: http::Response<Vec<u8>>) -> Result<(), ApiError> {
@@ -388,6 +422,11 @@ pub fn remove_docs_response(response: http::Response<Vec<u8>>) -> Result<(), Api
     }
 }
 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.publish.ex#L429
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/release_docs.ex#L11
 pub fn publish_docs_request(
     package_name: &str,
     version: &str,
@@ -421,6 +460,11 @@ pub fn publish_docs_response(response: http::Response<Vec<u8>>) -> Result<(), Ap
     }
 }
 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.publish.ex#L512
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/release.ex#L13
 pub fn publish_package_request(
     release_tarball: Vec<u8>,
     api_key: &str,
@@ -459,6 +503,11 @@ pub fn publish_package_response(response: http::Response<Vec<u8>>) -> Result<(),
     }
 }
 
+/// API Docs:
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/mix/tasks/hex.publish.ex#L371
+/// 
+/// https://github.com/hexpm/hex/blob/main/lib/hex/api/release.ex#L21
 pub fn revert_release_request(
     package_name: &str,
     version: &str,