Rust implementation of "rescript format"

CHANGELOG.md

@@ -12,6 +12,10 @@
 
 # 12.0.0-beta.2 (Unreleased)
 
+#### :boom: Breaking Change
+
+- Rust implementation of the `rescript format` command. Command line options changed from `-all`, `-check` and `-stdin` to `--all`, `--check` and `--stdin` compared to the legacy implementation. https://github.com/rescript-lang/rescript/pull/7603
+
 #### :nail_care: Polish
 
 - Add missing backtick and spaces to `Belt.Map.map` doc comment. https://github.com/rescript-lang/rescript/pull/7632

rewatch/Cargo.toml

@@ -20,11 +20,13 @@ log = { version = "0.4.17" }
 notify = { version = "5.1.0", features = ["serde"] }
 notify-debouncer-mini = { version = "0.2.0" }
 rayon = "1.6.1"
+num_cpus = "1.17.0"
 regex = "1.7.1"
 serde = { version = "1.0.152", features = ["derive"] }
 serde_derive = "1.0.152"
 serde_json = { version = "1.0.93" }
 sysinfo = "0.29.10"
+tempfile = "3.10.1"
 
 
 [profile.release]

rewatch/src/cli.rs

@@ -8,6 +8,16 @@ fn parse_regex(s: &str) -> Result<Regex, regex::Error> {
     Regex::new(s)
 }
 
+use clap::ValueEnum;
+
+#[derive(Debug, Clone, ValueEnum)]
+pub enum FileExtension {
+    #[value(name = ".res")]
+    Res,
+    #[value(name = ".resi")]
+    Resi,
+}
+
 /// ReScript - Fast, Simple, Fully Typed JavaScript from the Future
 #[derive(Parser, Debug)]
 #[command(version)]
@@ -169,11 +179,29 @@ pub enum Command {
         #[command(flatten)]
         dev: DevArg,
     },
-    /// Alias to `legacy format`.
-    #[command(disable_help_flag = true)]
+    /// Formats ReScript files.
     Format {
-        #[arg(allow_hyphen_values = true, num_args = 0..)]
-        format_args: Vec<OsString>,
+        /// Format the whole project.
+        #[arg(short, long, group = "format_input_mode")]
+        all: bool,
+
+        /// Check formatting status without applying changes.
+        #[arg(short, long)]
+        check: bool,
+
+        /// Read the code from stdin and print the formatted code to stdout.
+        #[arg(
+            short,
+            long,
+            group = "format_input_mode",
+            value_enum,
+            conflicts_with = "check"
+        )]
+        stdin: Option<FileExtension>,
+
+        /// Files to format.
+        #[arg(group = "format_input_mode")]
+        files: Vec<String>,
     },
     /// Alias to `legacy dump`.
     #[command(disable_help_flag = true)]

rewatch/src/format.rs

@@ -0,0 +1,127 @@
+use crate::helpers;
+use anyhow::{Result, bail};
+use num_cpus;
+use rayon::prelude::*;
+use std::fs;
+use std::io::{self, Write};
+use std::path::Path;
+use std::process::Command;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use crate::build::packages;
+use crate::cli::FileExtension;
+use clap::ValueEnum;
+
+pub fn format(
+    stdin_extension: Option<FileExtension>,
+    all: bool,
+    check: bool,
+    files: Vec<String>,
+) -> Result<()> {
+    let bsc_path = helpers::get_bsc();
+
+    match stdin_extension {
+        Some(extension) => {
+            format_stdin(&bsc_path, extension)?;
+        }
+        None => {
+            let files = if all { get_all_files()? } else { files };
+            format_files(&bsc_path, files, check)?;
+        }
+    }
+
+    Ok(())
+}
+
+fn get_all_files() -> Result<Vec<String>> {
+    let current_dir = std::env::current_dir()?;
+    let project_root = helpers::get_abs_path(&current_dir);
+    let workspace_root_option = helpers::get_workspace_root(&project_root);
+
+    let build_state = packages::make(&None, &project_root, &workspace_root_option, false, false)?;
+    let mut files: Vec<String> = Vec::new();
+
+    for (_package_name, package) in build_state {
+        if let Some(source_files) = package.source_files {
+            for (path, _metadata) in source_files {
+                if let Some(extension) = path.extension() {
+                    if extension == "res" || extension == "resi" {
+                        files.push(package.path.join(path).to_string_lossy().into_owned());
+                    }
+                }
+            }
+        }
+    }
+    Ok(files)
+}
+
+fn format_stdin(bsc_exe: &Path, extension: FileExtension) -> Result<()> {
+    let extension_value = extension
+        .to_possible_value()
+        .ok_or(anyhow::anyhow!("Could not get extension arg value"))?;
+
+    let mut temp_file = tempfile::Builder::new()
+        .suffix(extension_value.get_name())
+        .tempfile()?;
+    io::copy(&mut io::stdin(), &mut temp_file)?;
+    let temp_path = temp_file.path();
+
+    let mut cmd = Command::new(bsc_exe);
+    cmd.arg("-format").arg(temp_path);
+
+    let output = cmd.output()?;
+
+    if output.status.success() {
+        io::stdout().write_all(&output.stdout)?;
+    } else {
+        let stderr_str = String::from_utf8_lossy(&output.stderr);
+        bail!("Error formatting stdin: {}", stderr_str);
+    }
+
+    Ok(())
+}
+
+fn format_files(bsc_exe: &Path, files: Vec<String>, check: bool) -> Result<()> {
+    let batch_size = 4 * num_cpus::get();
+    let incorrectly_formatted_files = AtomicUsize::new(0);
+
+    files.par_chunks(batch_size).try_for_each(|batch| {
+        batch.iter().try_for_each(|file| {
+            let mut cmd = Command::new(bsc_exe);
+            if check {
+                cmd.arg("-format").arg(file);
+            } else {
+                cmd.arg("-o").arg(file).arg("-format").arg(file);
+            }
+
+            let output = cmd.output()?;
+
+            if output.status.success() {
+                if check {
+                    let original_content = fs::read_to_string(file)?;
+                    let formatted_content = String::from_utf8_lossy(&output.stdout);
+                    if original_content != formatted_content {
+                        eprintln!("[format check] {}", file);
+                        incorrectly_formatted_files.fetch_add(1, Ordering::SeqCst);
+                    }
+                }
+            } else {
+                let stderr_str = String::from_utf8_lossy(&output.stderr);
+                bail!("Error formatting {}: {}", file, stderr_str);
+            }
+            Ok(())
+        })
+    })?;
+
+    let count = incorrectly_formatted_files.load(Ordering::SeqCst);
+    if count > 0 {
+        if count == 1 {
+            eprintln!("The file listed above needs formatting");
+        } else {
+            eprintln!("The {} files listed above need formatting", count);
+        }
+        bail!("Formatting check failed");
+    }
+
+    Ok(())
+}

rewatch/src/lib.rs

@@ -2,6 +2,7 @@ pub mod build;
 pub mod cli;
 pub mod cmd;
 pub mod config;
+pub mod format;
 pub mod helpers;
 pub mod lock;
 pub mod queue;

rewatch/src/main.rs

@@ -3,7 +3,7 @@ use clap::Parser;
 use log::LevelFilter;
 use std::{io::Write, path::Path};
 
-use rewatch::{build, cli, cmd, lock, watcher};
+use rewatch::{build, cli, cmd, format, lock, watcher};
 
 fn main() -> Result<()> {
     let args = cli::Cli::parse();
@@ -91,11 +91,12 @@ fn main() -> Result<()> {
             let code = build::pass_through_legacy(legacy_args);
             std::process::exit(code);
         }
-        cli::Command::Format { mut format_args } => {
-            format_args.insert(0, "format".into());
-            let code = build::pass_through_legacy(format_args);
-            std::process::exit(code);
-        }
+        cli::Command::Format {
+            stdin,
+            all,
+            check,
+            files,
+        } => format::format(stdin, all, check, files),
         cli::Command::Dump { mut dump_args } => {
             dump_args.insert(0, "dump".into());
             let code = build::pass_through_legacy(dump_args);

rewatch/tests/format.sh

@@ -0,0 +1,43 @@
+source "./utils.sh"
+cd ../testrepo
+
+bold "Test: It should format all files"
+
+git diff --name-only ./
+error_output=$("$REWATCH_EXECUTABLE" format --all)
+git_diff_file_count=$(git diff --name-only ./ | wc -l | xargs)
+if [ $? -eq 0 ] && [ $git_diff_file_count -eq 4 ];
+then
+    success "Test package formatted. Got $git_diff_file_count changed files."
+    git restore .
+else
+    error "Error formatting test package"
+    echo $error_output
+    exit 1
+fi
+
+bold "Test: It should format a single file"
+
+error_output=$("$REWATCH_EXECUTABLE" format packages/dep01/src/Dep01.res)
+git_diff_file_count=$(git diff --name-only ./ | wc -l | xargs)
+if [ $? -eq 0 ] && [ $git_diff_file_count -eq 1 ];
+then
+    success "Single file formatted successfully"
+    git restore .
+else
+    error "Error formatting single file"
+    echo $error_output
+    exit 1
+fi
+
+bold "Test: It should format from stdin"
+
+error_output=$(echo "let x = 1" | "$REWATCH_EXECUTABLE" format --stdin .res)
+if [ $? -eq 0 ];
+then
+    success "Stdin formatted successfully"
+else
+    error "Error formatting from stdin"
+    echo $error_output
+    exit 1
+fi

rewatch/tests/suite-ci.sh

@@ -40,4 +40,4 @@ else
   exit 1
 fi
 
-./compile.sh && ./watch.sh && ./lock.sh && ./suffix.sh && ./legacy.sh
+./compile.sh && ./watch.sh && ./lock.sh && ./suffix.sh && ./legacy.sh && ./format.sh

scripts/format.sh

@@ -7,7 +7,7 @@ dune build @fmt --auto-promote
 
 echo Formatting ReScript code...
 files=$(find runtime tests -type f \( -name "*.res" -o -name "*.resi" \) ! -name "syntaxErrors*" ! -name "generated_mocha_test.res" ! -path "tests/syntax_tests*" ! -path "tests/analysis_tests/tests*" ! -path "*/node_modules/*")
-./cli/rescript-legacy.js format $files
+./cli/rescript.js format $files
 
 echo Formatting JS code...
 yarn format