Eliminate dependency on lazy_static

4 files changed, 14 insertions, 20 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 6d4ce94..49dcdcb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -301,7 +301,6 @@ version = "0.6.0"
 dependencies = [
  "chrono",
  "clap",
- "lazy_static",
  "libc",
  "log",
  "maildir",
@@ -312,12 +311,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-
-[[package]]
 name = "libc"
 version = "0.2.140"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index 5532356..a9a9c42 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,6 @@ libc = "0.2"
 maildir = "0.6"
 serde_json = "1.0"
 serde = { version = "1.0", features = ["derive"] }
-lazy_static = "1.4"
 mailparse = "0.14"
 chrono = "0.4"
 clap = { version = "4.0", features = ["derive"] }
diff --git a/src/cmd/folders.rs b/src/cmd/folders.rs
index 7bf93f1..0133528 100644
--- a/src/cmd/folders.rs
+++ b/src/cmd/folders.rs
@@ -1,23 +1,25 @@
 use std::collections::BTreeSet;
 use std::ffi::{OsStr, OsString};
 use std::path::Path;
+use std::sync::OnceLock;
 
-use lazy_static::lazy_static;
 use maildir::Maildir;
 
 use crate::error::Result;
 
-lazy_static! {
-    static ref REQUIRED_MAILDIR_DIRS: BTreeSet<OsString> = [
-        OsString::from("cur"),
-        "new".into(),
-        "tmp".into(),
-        "maildirfolder".into(),
-    ]
-    .into();
-}
+static REQUIRED_MAILDIR_DIRS: OnceLock<BTreeSet<OsString>> = OnceLock::new();
 
 fn is_mailsubdir(p: &Path) -> bool {
+    let rmd = REQUIRED_MAILDIR_DIRS.get_or_init(|| {
+        [
+            OsString::from("cur"),
+            "new".into(),
+            "tmp".into(),
+            "maildirfolder".into(),
+        ]
+        .into()
+    });
+
     p.is_dir()
         && p.file_name()
             .map_or(false, |fname| fname.to_string_lossy().starts_with('.'))
@@ -29,7 +31,7 @@ fn is_mailsubdir(p: &Path) -> bool {
                         .and_then(|dir_entry| dir_entry.path().file_name().map(OsStr::to_owned))
                 })
                 .collect::<BTreeSet<_>>()
-                .is_superset(&REQUIRED_MAILDIR_DIRS)
+                .is_superset(rmd)
             })
             .unwrap_or_default()
 }
diff --git a/src/cmd/list.rs b/src/cmd/list.rs
index 0ec0389..b77a311 100644
--- a/src/cmd/list.rs
+++ b/src/cmd/list.rs
@@ -24,7 +24,7 @@ fn mid_to_rec_time(mid: &str) -> f64 {
         warn!("Invaild mail-id {}", mid);
         return 0.0;
     };
-    let Some(sep) = mid[dec+1..].find('.') else {
+    let Some(sep) = mid[dec + 1..].find('.') else {
         return 0.0;
     };
     mid[..dec + 1 + sep].parse().unwrap()