Make prettier_eex_formatter work on OTP 21 and 22 (#39)

Use OTP 21 to build prettier_eex_formatter

.github/workflows/ci.yml

@@ -24,10 +24,12 @@ jobs:
         with:
           submodules: 'true'
 
-      - uses: erlef/setup-elixir@v1
+      # Used to build prettier_eex_formatter
+      # Versions from prettier_eex_formatter/.tools_versions
+      - uses: erlef/setup-beam@v1
         with:
-          otp-version: ${{ matrix.otp }}
-          elixir-version: ${{ matrix.elixir }}
+          otp-version: '21.3.8.22'
+          elixir-version: '1.8.2'
 
       - uses: actions/setup-node@v2
         with:
@@ -49,3 +51,14 @@ jobs:
       - run: yarn install --frozen-lockfile
       - run: yarn lint
       - run: yarn test
+
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: ${{ matrix.otp }}
+          elixir-version: ${{ matrix.elixir }}
+
+      - name: Test Elixir integration
+        run: |
+          cd tests_elixir
+          elixir --version
+          mix prettier

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to the prettier-plugin-eex will be documented in this file.
 - Return non 0 exit status when error formatting is unsuccessful
 - Use `print` function instead of `embed` to fix error logging
 - Fix formatting of files that consist of only a single expression
+- Make `prettier_eex_formatter` work on 21 and 22 OTP
 
 ## v0.4.0 - 24 February 2021
 

README.md

@@ -6,6 +6,11 @@
   yarn add -D prettier prettier-plugin-eex
 ```
 
+## Supported versions
+
+- Elixir 1.8 minimum
+- Erlang OTP 21 minimum
+
 ## Config options
 
 * printWidth - used by Prettier directly

tests_elixir/.gitignore

@@ -0,0 +1,20 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez

tests_elixir/formatted_views/multiline.html.eex

@@ -0,0 +1,6 @@
+<%=
+  link_to(
+    a: "b",
+    c: "e"
+  )
+%>

tests_elixir/mix.exs

@@ -0,0 +1,18 @@
+defmodule TestsElixir.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :tests_elixir,
+      version: "0.1.0",
+      elixir: "~> 1.8",
+      aliases: aliases()
+    ]
+  end
+
+  def aliases do
+    [
+      prettier: "cmd ../node_modules/.bin/prettier --plugin ../ --check ./formatted_views --color"
+    ]
+  end
+end