cli: implement the --clear-cache option

Fixes #16

src/command/format.rs

@@ -6,7 +6,7 @@ use directories::ProjectDirs;
 use std::fs;
 use std::path::PathBuf;
 
-pub fn format_cmd(work_dir: &PathBuf, paths: &[PathBuf]) -> anyhow::Result<()> {
+pub fn format_cmd(work_dir: &PathBuf, paths: &[PathBuf], clear_cache: bool) -> anyhow::Result<()> {
     let proj_dirs = match ProjectDirs::from("com", "NumTide", "treefmt") {
         Some(x) => x,
         None => {
@@ -41,7 +41,7 @@ pub fn format_cmd(work_dir: &PathBuf, paths: &[PathBuf]) -> anyhow::Result<()> {
     ));
 
     // Finally run the main formatter logic from the engine.
-    run_treefmt(&work_dir, &cache_dir, &config_file, &paths)?;
+    run_treefmt(&work_dir, &cache_dir, &config_file, &paths, clear_cache)?;
 
     Ok(())
 }

src/command/mod.rs

@@ -26,6 +26,10 @@ pub struct Cli {
     #[structopt(long = "init")]
     pub init: bool,
 
+    /// Clear the evaluation cache. Use in case the cache is not precise enough.
+    #[structopt(long = "clear-cache")]
+    pub clear_cache: bool,
+
     /// Log verbosity is based off the number of v used
     #[structopt(long = "verbose", short = "v", parse(from_occurrences))]
     pub verbosity: u8,
@@ -63,7 +67,7 @@ pub fn run_cli(cli: &Cli) -> anyhow::Result<()> {
     if cli.init {
         init_cmd(&cli.work_dir)?
     } else {
-        format_cmd(&cli.work_dir, &cli.paths)?
+        format_cmd(&cli.work_dir, &cli.paths, cli.clear_cache)?
     }
 
     Ok(())

src/engine.rs

@@ -13,6 +13,7 @@ pub fn run_treefmt(
     cache_dir: &PathBuf,
     treefmt_toml: &PathBuf,
     paths: &[PathBuf],
+    clear_cache: bool,
 ) -> anyhow::Result<()> {
     assert!(work_dir.is_absolute());
     assert!(cache_dir.is_absolute());
@@ -78,7 +79,12 @@ pub fn run_treefmt(
     ));
 
     // Load the eval cache
-    let cache = CacheManifest::load(&cache_dir, &treefmt_toml);
+    let cache = if clear_cache {
+        // Start with an empty cache
+        CacheManifest::default()
+    } else {
+        CacheManifest::load(&cache_dir, &treefmt_toml)
+    };
     CLOG.debug(&format!("load cache: {}", start_time.elapsed().as_millis()));
     // Insert the new formatter configs
     let cache = cache.update_formatters(formatters.clone());