Add support for treefmt

CHANGELOG.md

@@ -32,6 +32,7 @@ The format is based on [Keep a Changelog].
   clojurescript, edn files. ([#271])
 * Stylua is used now in `lua-ts-mode` as well as just `lua-mode`, by
   default ([#275]).
+* [`treefmt`](https://numtide.github.io/treefmt) for project configured formatters ([#280]).
 
 ### Bugs fixed
 * Apheleia sometimes failed to determine indent level from Emacs

apheleia-formatters.el

@@ -185,6 +185,7 @@
     (stylua . ("stylua" "-"))
     (rustfmt . ("rustfmt" "--quiet" "--emit" "stdout"))
     (terraform . ("terraform" "fmt" "-"))
+    (treefmt . ("treefmt" "--stdin" filepath))
     (xmllint . ("xmllint" "--format" "-"))
     (yapf . ("yapf"))
     (yq-csv . ("yq" "--prettyPrint" "--no-colors"

test/formatters/installers/treefmt.bash

@@ -0,0 +1,11 @@
+ver="$(latest_release numtide/treefmt)"
+
+wget "https://github.com/numtide/treefmt/releases/download/${ver}/treefmt-x86_64-unknown-linux-gnu.tar.gz" -O - | tar -C /usr/local/bin -xz
+chmod +x /usr/local/bin/treefmt
+
+apt-get install -y rustfmt
+cat <<EOT >> /tmp/treefmt.toml
+[formatter.rust]
+command = "rustfmt"
+includes = ["*.rs"]
+EOT

test/formatters/samplecode/treefmt/in.rs

@@ -0,0 +1,12 @@
+fn foo() {
+    println!("a");
+}
+
+
+
+fn bar() {
+    println!("b");
+
+
+    println!("c");
+}

test/formatters/samplecode/treefmt/out.rs

@@ -0,0 +1,9 @@
+fn foo() {
+    println!("a");
+}
+
+fn bar() {
+    println!("b");
+
+    println!("c");
+}