Update to rust 1.58, fix a bunch of optional lints

9 files changed, 64 insertions, 67 deletions

diff --git a/flake.lock b/flake.lock
index 606a72f3..94e443e3 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "devshell": {
       "locked": {
-        "lastModified": 1640301433,
-        "narHash": "sha256-eplae8ZNiEmxbOgwUn9IihaJfEUxoUilkwciRPGskYE=",
+        "lastModified": 1641980203,
+        "narHash": "sha256-RiWJ3+6V267Ji+P54K1Xrj1Nsah9BfG/aLfIhqgVyBY=",
         "owner": "numtide",
         "repo": "devshell",
-        "rev": "f87fb932740abe1c1b46f6edd8a36ade17881666",
+        "rev": "d897c1ddb4eab66cc2b783c7868d78555b9880ad",
         "type": "github"
       },
       "original": {
@@ -41,11 +41,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1641449444,
-        "narHash": "sha256-InqsyCVafPqXmK7YqUfFVpb6eVYJWUWbYXEvey0J+3c=",
+        "lastModified": 1642054253,
+        "narHash": "sha256-kHh9VmaB7gbS6pheheC4x0uT84LEmhfbsbWEQJgU2E4=",
         "owner": "yusdacra",
         "repo": "nix-cargo-integration",
-        "rev": "d1aa15a832db331a97082b7f8c7da737a6789c77",
+        "rev": "f8fa9af990195a3f63fe2dde84aa187e193da793",
         "type": "github"
       },
       "original": {
@@ -56,11 +56,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1639699734,
-        "narHash": "sha256-tlX6WebGmiHb2Hmniff+ltYp+7dRfdsBxw9YczLsP60=",
+        "lastModified": 1641887635,
+        "narHash": "sha256-kDGpufwzVaiGe5e1sBUBPo9f1YN+nYHJlYqCaVpZTQQ=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "03ec468b14067729a285c2c7cfa7b9434a04816c",
+        "rev": "b2737d4980a17cc2b7d600d7d0b32fd7333aca88",
         "type": "github"
       },
       "original": {
@@ -99,11 +99,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1639880499,
-        "narHash": "sha256-/BibDmFwgWuuTUkNVO6YlvuTSWM9dpBvlZoTAPs7ORI=",
+        "lastModified": 1642128126,
+        "narHash": "sha256-av8JUACdrTfQYl/ftZJvKpZEmZfa0avCq7tt5Usdoq0=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "c6c83589ae048af20d93d01eb07a4176012093d0",
+        "rev": "ce4ef6f2d74f2b68f7547df1de22d1b0037ce4ad",
         "type": "github"
       },
       "original": {
diff --git a/helix-core/src/increment/date_time.rs b/helix-core/src/increment/date_time.rs
index e3cfe107..1703c3ba 100644
--- a/helix-core/src/increment/date_time.rs
+++ b/helix-core/src/increment/date_time.rs
@@ -195,82 +195,82 @@ struct DateField {
 impl DateField {
     fn from_specifier(specifier: &str) -> Option<Self> {
         match specifier {
-            "Y" => Some(DateField {
+            "Y" => Some(Self {
                 regex: r"\d{4}",
                 unit: DateUnit::Years,
                 max_len: 5,
             }),
-            "y" => Some(DateField {
+            "y" => Some(Self {
                 regex: r"\d\d",
                 unit: DateUnit::Years,
                 max_len: 2,
             }),
-            "m" => Some(DateField {
+            "m" => Some(Self {
                 regex: r"[0-1]\d",
                 unit: DateUnit::Months,
                 max_len: 2,
             }),
-            "d" => Some(DateField {
+            "d" => Some(Self {
                 regex: r"[0-3]\d",
                 unit: DateUnit::Days,
                 max_len: 2,
             }),
-            "-d" => Some(DateField {
+            "-d" => Some(Self {
                 regex: r"[1-3]?\d",
                 unit: DateUnit::Days,
                 max_len: 2,
             }),
-            "a" => Some(DateField {
+            "a" => Some(Self {
                 regex: r"Sun|Mon|Tue|Wed|Thu|Fri|Sat",
                 unit: DateUnit::Days,
                 max_len: 3,
             }),
-            "A" => Some(DateField {
+            "A" => Some(Self {
                 regex: r"Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday",
                 unit: DateUnit::Days,
                 max_len: 9,
             }),
-            "b" | "h" => Some(DateField {
+            "b" | "h" => Some(Self {
                 regex: r"Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec",
                 unit: DateUnit::Months,
                 max_len: 3,
             }),
-            "B" => Some(DateField {
+            "B" => Some(Self {
                 regex: r"January|February|March|April|May|June|July|August|September|October|November|December",
                 unit: DateUnit::Months,
                 max_len: 9,
             }),
-            "H" => Some(DateField {
+            "H" => Some(Self {
                 regex: r"[0-2]\d",
                 unit: DateUnit::Hours,
                 max_len: 2,
             }),
-            "M" => Some(DateField {
+            "M" => Some(Self {
                 regex: r"[0-5]\d",
                 unit: DateUnit::Minutes,
                 max_len: 2,
             }),
-            "S" => Some(DateField {
+            "S" => Some(Self {
                 regex: r"[0-5]\d",
                 unit: DateUnit::Seconds,
                 max_len: 2,
             }),
-            "I" => Some(DateField {
+            "I" => Some(Self {
                 regex: r"[0-1]\d",
                 unit: DateUnit::Hours,
                 max_len: 2,
             }),
-            "-I" => Some(DateField {
+            "-I" => Some(Self {
                 regex: r"1?\d",
                 unit: DateUnit::Hours,
                 max_len: 2,
             }),
-            "P" => Some(DateField {
+            "P" => Some(Self {
                 regex: r"am|pm",
                 unit: DateUnit::AmPm,
                 max_len: 2,
             }),
-            "p" => Some(DateField {
+            "p" => Some(Self {
                 regex: r"AM|PM",
                 unit: DateUnit::AmPm,
                 max_len: 2,
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index c14216c0..9ac12931 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -173,7 +173,7 @@ macro_rules! static_commands {
 impl MappableCommand {
     pub fn execute(&self, cx: &mut Context) {
         match &self {
-            MappableCommand::Typable { name, args, doc: _ } => {
+            Self::Typable { name, args, doc: _ } => {
                 let args: Vec<Cow<str>> = args.iter().map(Cow::from).collect();
                 if let Some(command) = cmd::TYPABLE_COMMAND_MAP.get(name.as_str()) {
                     let mut cx = compositor::Context {
@@ -186,21 +186,21 @@ impl MappableCommand {
                     }
                 }
             }
-            MappableCommand::Static { fun, .. } => (fun)(cx),
+            Self::Static { fun, .. } => (fun)(cx),
         }
     }
 
     pub fn name(&self) -> &str {
         match &self {
-            MappableCommand::Typable { name, .. } => name,
-            MappableCommand::Static { name, .. } => name,
+            Self::Typable { name, .. } => name,
+            Self::Static { name, .. } => name,
         }
     }
 
     pub fn doc(&self) -> &str {
         match &self {
-            MappableCommand::Typable { doc, .. } => doc,
-            MappableCommand::Static { doc, .. } => doc,
+            Self::Typable { doc, .. } => doc,
+            Self::Static { doc, .. } => doc,
         }
     }
 
@@ -3494,11 +3494,9 @@ pub fn apply_document_resource_op(op: &lsp::ResourceOp) -> std::io::Result<()> {
     match op {
         ResourceOp::Create(op) => {
             let path = op.uri.to_file_path().unwrap();
-            let ignore_if_exists = if let Some(options) = &op.options {
+            let ignore_if_exists = op.options.as_ref().map_or(false, |options| {
                 !options.overwrite.unwrap_or(false) && options.ignore_if_exists.unwrap_or(false)
-            } else {
-                false
-            };
+            });
             if ignore_if_exists && path.exists() {
                 Ok(())
             } else {
@@ -3508,11 +3506,12 @@ pub fn apply_document_resource_op(op: &lsp::ResourceOp) -> std::io::Result<()> {
         ResourceOp::Delete(op) => {
             let path = op.uri.to_file_path().unwrap();
             if path.is_dir() {
-                let recursive = if let Some(options) = &op.options {
-                    options.recursive.unwrap_or(false)
-                } else {
-                    false
-                };
+                let recursive = op
+                    .options
+                    .as_ref()
+                    .and_then(|options| options.recursive)
+                    .unwrap_or(false);
+
                 if recursive {
                     fs::remove_dir_all(&path)
                 } else {
@@ -3527,11 +3526,9 @@ pub fn apply_document_resource_op(op: &lsp::ResourceOp) -> std::io::Result<()> {
         ResourceOp::Rename(op) => {
             let from = op.old_uri.to_file_path().unwrap();
             let to = op.new_uri.to_file_path().unwrap();
-            let ignore_if_exists = if let Some(options) = &op.options {
+            let ignore_if_exists = op.options.as_ref().map_or(false, |options| {
                 !options.overwrite.unwrap_or(false) && options.ignore_if_exists.unwrap_or(false)
-            } else {
-                false
-            };
+            });
             if ignore_if_exists && to.exists() {
                 Ok(())
             } else {
diff --git a/helix-term/src/job.rs b/helix-term/src/job.rs
index 4fa38174..f5a0a425 100644
--- a/helix-term/src/job.rs
+++ b/helix-term/src/job.rs
@@ -22,8 +22,8 @@ pub struct Jobs {
 }
 
 impl Job {
-    pub fn new<F: Future<Output = anyhow::Result<()>> + Send + 'static>(f: F) -> Job {
-        Job {
+    pub fn new<F: Future<Output = anyhow::Result<()>> + Send + 'static>(f: F) -> Self {
+        Self {
             future: f.map(|r| r.map(|()| None)).boxed(),
             wait: false,
         }
@@ -31,22 +31,22 @@ impl Job {
 
     pub fn with_callback<F: Future<Output = anyhow::Result<Callback>> + Send + 'static>(
         f: F,
-    ) -> Job {
-        Job {
+    ) -> Self {
+        Self {
             future: f.map(|r| r.map(Some)).boxed(),
             wait: false,
         }
     }
 
-    pub fn wait_before_exiting(mut self) -> Job {
+    pub fn wait_before_exiting(mut self) -> Self {
         self.wait = true;
         self
     }
 }
 
 impl Jobs {
-    pub fn new() -> Jobs {
-        Jobs::default()
+    pub fn new() -> Self {
+        Self::default()
     }
 
     pub fn spawn<F: Future<Output = anyhow::Result<()>> + Send + 'static>(&mut self, f: F) {
diff --git a/helix-term/src/keymap.rs b/helix-term/src/keymap.rs
index c4bd25ed..79a06206 100644
--- a/helix-term/src/keymap.rs
+++ b/helix-term/src/keymap.rs
@@ -344,7 +344,7 @@ pub struct Keymap {
 
 impl Keymap {
     pub fn new(root: KeyTrie) -> Self {
-        Keymap {
+        Self {
             root,
             state: Vec::new(),
             sticky: None,
@@ -368,7 +368,7 @@ impl Keymap {
     /// key cancels pending keystrokes. If there are no pending keystrokes but a
     /// sticky node is in use, it will be cleared.
     pub fn get(&mut self, key: KeyEvent) -> KeymapResult {
-        if let key!(Esc) = key {
+        if key!(Esc) == key {
             if !self.state.is_empty() {
                 return KeymapResult::new(
                     // Note that Esc is not included here
@@ -477,7 +477,7 @@ impl DerefMut for Keymaps {
 }
 
 impl Default for Keymaps {
-    fn default() -> Keymaps {
+    fn default() -> Self {
         let normal = keymap!({ "Normal mode"
             "h" | "left" => move_char_left,
             "j" | "down" => move_line_down,
@@ -784,7 +784,7 @@ impl Default for Keymaps {
             "C-x" => completion,
             "C-r" => insert_register,
         });
-        Keymaps(hashmap!(
+        Self(hashmap!(
             Mode::Normal => Keymap::new(normal),
             Mode::Select => Keymap::new(select),
             Mode::Insert => Keymap::new(insert),
diff --git a/helix-term/src/ui/completion.rs b/helix-term/src/ui/completion.rs
index 274330c0..c9ed3b4a 100644
--- a/helix-term/src/ui/completion.rs
+++ b/helix-term/src/ui/completion.rs
@@ -158,7 +158,7 @@ impl Completion {
                     let resolved_additional_text_edits = if item.additional_text_edits.is_some() {
                         None
                     } else {
-                        Completion::resolve_completion_item(doc, item.clone())
+                        Self::resolve_completion_item(doc, item.clone())
                             .and_then(|item| item.additional_text_edits)
                     };
 
diff --git a/helix-tui/src/widgets/block.rs b/helix-tui/src/widgets/block.rs
index d43ad41d..26223c3e 100644
--- a/helix-tui/src/widgets/block.rs
+++ b/helix-tui/src/widgets/block.rs
@@ -15,12 +15,12 @@ pub enum BorderType {
 }
 
 impl BorderType {
-    pub fn line_symbols(border_type: BorderType) -> line::Set {
+    pub fn line_symbols(border_type: Self) -> line::Set {
         match border_type {
-            BorderType::Plain => line::NORMAL,
-            BorderType::Rounded => line::ROUNDED,
-            BorderType::Double => line::DOUBLE,
-            BorderType::Thick => line::THICK,
+            Self::Plain => line::NORMAL,
+            Self::Rounded => line::ROUNDED,
+            Self::Double => line::DOUBLE,
+            Self::Thick => line::THICK,
         }
     }
 }
diff --git a/helix-tui/src/widgets/paragraph.rs b/helix-tui/src/widgets/paragraph.rs
index 8bafbb9a..4e839162 100644
--- a/helix-tui/src/widgets/paragraph.rs
+++ b/helix-tui/src/widgets/paragraph.rs
@@ -166,7 +166,7 @@ impl<'a> Widget for Paragraph<'a> {
             Box::new(WordWrapper::new(&mut styled, text_area.width, trim))
         } else {
             let mut line_composer = Box::new(LineTruncator::new(&mut styled, text_area.width));
-            if let Alignment::Left = self.alignment {
+            if self.alignment == Alignment::Left {
                 line_composer.set_horizontal_offset(self.scroll.1);
             }
             line_composer
diff --git a/helix-view/src/info.rs b/helix-view/src/info.rs
index b5a002fa..73856154 100644
--- a/helix-view/src/info.rs
+++ b/helix-view/src/info.rs
@@ -16,7 +16,7 @@ pub struct Info {
 }
 
 impl Info {
-    pub fn new(title: &str, body: Vec<(&str, BTreeSet<KeyEvent>)>) -> Info {
+    pub fn new(title: &str, body: Vec<(&str, BTreeSet<KeyEvent>)>) -> Self {
         let body = body
             .into_iter()
             .map(|(desc, events)| {
@@ -38,7 +38,7 @@ impl Info {
             );
         }
 
-        Info {
+        Self {
             title: title.to_string(),
             width: text.lines().map(|l| l.width()).max().unwrap() as u16,
             height: body.len() as u16,