perf: Lazy load files from directory (#335)

Changes context to use `once_cell` to lazily evaluate directory listing on first use.

6 files changed, 12 insertions, 12 deletions

diff --git a/src/modules/golang.rs b/src/modules/golang.rs
index 4676f9e6d..9bbf0c16b 100644
--- a/src/modules/golang.rs
+++ b/src/modules/golang.rs
@@ -15,11 +15,11 @@ use super::{Context, Module};
 ///     - Current directory contains a file with the `.go` extension
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_go_project = context
-        .new_scan_dir()
+        .try_begin_scan()?
         .set_files(&["go.mod", "go.sum", "glide.yaml", "Gopkg.yml", "Gopkg.lock"])
         .set_extensions(&["go"])
         .set_folders(&["Godeps"])
-        .scan();
+        .is_match();
 
     if !is_go_project {
         return None;
diff --git a/src/modules/nodejs.rs b/src/modules/nodejs.rs
index 180e143ff..b30f2f531 100644
--- a/src/modules/nodejs.rs
+++ b/src/modules/nodejs.rs
@@ -11,11 +11,11 @@ use super::{Context, Module};
 ///     - Current directory contains a `node_modules` directory
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_js_project = context
-        .new_scan_dir()
+        .try_begin_scan()?
         .set_files(&["package.json"])
         .set_extensions(&["js"])
         .set_folders(&["node_modules"])
-        .scan();
+        .is_match();
 
     if !is_js_project {
         return None;
diff --git a/src/modules/python.rs b/src/modules/python.rs
index 487d033d5..84ca0e7e8 100644
--- a/src/modules/python.rs
+++ b/src/modules/python.rs
@@ -16,7 +16,7 @@ use super::{Context, Module};
 ///     - Current directory contains a `Pipfile` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_py_project = context
-        .new_scan_dir()
+        .try_begin_scan()?
         .set_files(&[
             "requirements.txt",
             ".python-version",
@@ -24,7 +24,7 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
             "Pipfile",
         ])
         .set_extensions(&["py"])
-        .scan();
+        .is_match();
 
     if !is_py_project {
         return None;
diff --git a/src/modules/ruby.rs b/src/modules/ruby.rs
index 7e689234d..0faa2ccf8 100644
--- a/src/modules/ruby.rs
+++ b/src/modules/ruby.rs
@@ -10,10 +10,10 @@ use super::{Context, Module};
 ///     - Current directory contains a `Gemfile` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_rb_project = context
-        .new_scan_dir()
+        .try_begin_scan()?
         .set_files(&["Gemfile"])
         .set_extensions(&["rb"])
-        .scan();
+        .is_match();
 
     if !is_rb_project {
         return None;
diff --git a/src/modules/rust.rs b/src/modules/rust.rs
index 26ee377c9..2008a539d 100644
--- a/src/modules/rust.rs
+++ b/src/modules/rust.rs
@@ -10,10 +10,10 @@ use super::{Context, Module};
 ///     - Current directory contains a `Cargo.toml` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_rs_project = context
-        .new_scan_dir()
+        .try_begin_scan()?
         .set_files(&["Cargo.toml"])
         .set_extensions(&["rs"])
-        .scan();
+        .is_match();
 
     if !is_rs_project {
         return None;
diff --git a/src/modules/time.rs b/src/modules/time.rs
index 0450e86fe..61a68c724 100644
--- a/src/modules/time.rs
+++ b/src/modules/time.rs
@@ -41,8 +41,8 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
 
 /// Format a given time into the given string. This function should be referentially
 /// transparent, which makes it easy to test (unlike anything involving the actual time)
-fn format_time(time_format: &str, localtime: DateTime<Local>) -> String {
-    localtime.format(time_format).to_string()
+fn format_time(time_format: &str, local_time: DateTime<Local>) -> String {
+    local_time.format(time_format).to_string()
 }
 
 /* Because we cannot make acceptance tests for the time module, these unit