From 4e045cb186cda395b22dc1cdba7dc9906c64bdee Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 17:57:39 +0200
Subject: [PATCH 01/31] Fix typo:  `analzer` instead of `analyzer`

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 72b9565..3a36474 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -79,7 +79,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     let matches = match opts.parse(std::env::args()) {
         Ok(it) => it,
         Err(err) => {
-            usage("commit-analzer", opts);
+            usage("commit-analyzer", opts);
             return Err(err.into());
         }
     };

From 1c1208473c3847f1932f477f824abf84dabd418f Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:06:28 +0200
Subject: [PATCH 02/31] Create usage.rs

---
 src/usage.rs | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 src/usage.rs

diff --git a/src/usage.rs b/src/usage.rs
new file mode 100644
index 0000000..9be6eb5
--- /dev/null
+++ b/src/usage.rs
@@ -0,0 +1,5 @@
+pub fn usage (app_name: & str, opts: & getopts :: Options)
+{
+    println ! ("Usage: {} <FILE> [OPTIONS]", app_name);
+    println ! ("{}", options.usage ("Parses the output of `git log`."));
+}

From eed16079332145ac48916b470e9dc1319f063f69 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:09:23 +0200
Subject: [PATCH 03/31] Load function from module

---
 src/main.rs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 3a36474..ca2de91 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,8 @@
+use crate :: usage :: usage;
 use std::{collections::HashMap, error::Error, io::Write, num::ParseIntError, ops::AddAssign};
 
+pub mod usage;
+
 fn main() -> Result<(), Box<dyn Error>> {
     let mut opts = getopts::Options::new();
     let opts = opts
@@ -176,11 +179,6 @@ fn main() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-fn usage(program_name: &str, opts: &getopts::Options) {
-    println!("Usage: {} <FILE> [OPTIONS]\n", program_name);
-    println!("{}", opts.usage("Parses the output of `git log`."));
-}
-
 fn matches_filter(commit: &Commit, filter: &Filter) -> bool {
     filter.check_author_name(&commit.author.name)
         && filter.check_author_email(&commit.author.email)

From f580e792cb180de12c729d538db21afd52343918 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:10:39 +0200
Subject: [PATCH 04/31] Fix typo:  wrong parameter name

---
 src/usage.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/usage.rs b/src/usage.rs
index 9be6eb5..aeec257 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -1,4 +1,4 @@
-pub fn usage (app_name: & str, opts: & getopts :: Options)
+pub fn usage (app_name: & str, options: & getopts :: Options)
 {
     println ! ("Usage: {} <FILE> [OPTIONS]", app_name);
     println ! ("{}", options.usage ("Parses the output of `git log`."));

From 8db2f263a2562245e19ff638870da8275b93a0b1 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:28:55 +0200
Subject: [PATCH 05/31] Make the functon `return` at the end explicitly

---
 src/usage.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/usage.rs b/src/usage.rs
index aeec257..9a8f5e3 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -1,5 +1,6 @@
-pub fn usage (app_name: & str, options: & getopts :: Options)
+pub fn usage (app_name: & str, options: & getopts :: Options) -> ()
 {
     println ! ("Usage: {} <FILE> [OPTIONS]", app_name);
     println ! ("{}", options.usage ("Parses the output of `git log`."));
+    return;
 }

From 0ad091bb3e04545a289013e5de577e4e6d8970e7 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:35:38 +0200
Subject: [PATCH 06/31] Add missing full stop

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index ca2de91..48bf64d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,7 +6,7 @@ pub mod usage;
 fn main() -> Result<(), Box<dyn Error>> {
     let mut opts = getopts::Options::new();
     let opts = opts
-        .optflag("q", "quiet", "Hides the output of commit messages")
+        .optflag("q", "quiet", "Hides the output of commit messages.")
         .optmulti(
             "a",
             "author-contains",

From f6cf1841d7bed7dbd3b4a0805980bd976def7793 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:37:46 +0200
Subject: [PATCH 07/31] Add option for help

---
 src/main.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 48bf64d..1f5fe3e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,6 +7,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     let mut opts = getopts::Options::new();
     let opts = opts
         .optflag("q", "quiet", "Hides the output of commit messages.")
+        .optflag("h", "help", "Show this help and exit.")
         .optmulti(
             "a",
             "author-contains",
@@ -86,6 +87,11 @@ fn main() -> Result<(), Box<dyn Error>> {
             return Err(err.into());
         }
     };
+    if matches.opt_present ("h")
+    {
+        usage (& matches.free[0x0], opts);
+        return Ok (());
+    };
     if matches.free.len() < 2 {
         usage(&matches.free[0], opts);
         return Ok(());

From 66d03eb67d1d00de92794f055221e78bb27bf409 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 18:55:44 +0200
Subject: [PATCH 08/31] Remove obsolete visibility level

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 1f5fe3e..cfcb51f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 use crate :: usage :: usage;
 use std::{collections::HashMap, error::Error, io::Write, num::ParseIntError, ops::AddAssign};
 
-pub mod usage;
+mod usage;
 
 fn main() -> Result<(), Box<dyn Error>> {
     let mut opts = getopts::Options::new();

From 962bf786b139a851adcec8f6139563084cb5f7b2 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:24:32 +0200
Subject: [PATCH 09/31] Load required module appropriately

---
 src/usage.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/usage.rs b/src/usage.rs
index 9a8f5e3..93cdfb8 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -1,4 +1,6 @@
-pub fn usage (app_name: & str, options: & getopts :: Options) -> ()
+use getopts :: Options;
+
+pub fn usage (app_name: & str, options: & Options) -> ()
 {
     println ! ("Usage: {} <FILE> [OPTIONS]", app_name);
     println ! ("{}", options.usage ("Parses the output of `git log`."));

From c9ed9e791a01272709c7c6a16af0c87915b38b08 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:26:08 +0200
Subject: [PATCH 10/31] Hard code application name

---
 src/usage.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/usage.rs b/src/usage.rs
index 93cdfb8..a680be9 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -2,7 +2,8 @@ use getopts :: Options;
 
 pub fn usage (app_name: & str, options: & Options) -> ()
 {
-    println ! ("Usage: {} <FILE> [OPTIONS]", app_name);
-    println ! ("{}", options.usage ("Parses the output of `git log`."));
+    println ! ( "Usage: commit-analyzer <FILE> [OPTIONS]\n{}"
+              , options.usage ("Parses the output of `git log`.")
+              );
     return;
 }

From 36a3e8c39e2fb33e0b2c2ecd9eec5b03538908bf Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:27:30 +0200
Subject: [PATCH 11/31] Adjust function call due to previous commit

---
 src/main.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index cfcb51f..d817b96 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -83,17 +83,17 @@ fn main() -> Result<(), Box<dyn Error>> {
     let matches = match opts.parse(std::env::args()) {
         Ok(it) => it,
         Err(err) => {
-            usage("commit-analyzer", opts);
+            usage(opts);
             return Err(err.into());
         }
     };
     if matches.opt_present ("h")
     {
-        usage (& matches.free[0x0], opts);
+        usage (opts);
         return Ok (());
     };
     if matches.free.len() < 2 {
-        usage(&matches.free[0], opts);
+        usage(opts);
         return Ok(());
     }
     let is_quiet = matches.opt_present("q");

From b6cc1048454cfa95edf20c8798edb0e115e3a65d Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:28:37 +0200
Subject: [PATCH 12/31] Remove obsolete parameter

---
 src/usage.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/usage.rs b/src/usage.rs
index a680be9..b66d982 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -1,6 +1,6 @@
 use getopts :: Options;
 
-pub fn usage (app_name: & str, options: & Options) -> ()
+pub fn usage (options: & Options) -> ()
 {
     println ! ( "Usage: commit-analyzer <FILE> [OPTIONS]\n{}"
               , options.usage ("Parses the output of `git log`.")

From 706341671ece729ddd8338aa931793f374ab8f3d Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:30:26 +0200
Subject: [PATCH 13/31] Unite control flow branches

---
 src/main.rs | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index d817b96..982a9af 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -87,15 +87,11 @@ fn main() -> Result<(), Box<dyn Error>> {
             return Err(err.into());
         }
     };
-    if matches.opt_present ("h")
+    if matches.opt_present ("h") || matches.free.len < 0x2
     {
         usage (opts);
         return Ok (());
     };
-    if matches.free.len() < 2 {
-        usage(opts);
-        return Ok(());
-    }
     let is_quiet = matches.opt_present("q");
     let max_diff_hours: u32 = match matches.opt_str("duration").map(|str| str.parse()) {
         None => 3,

From 560097408d6a78fcce4e29d3cd1ca9ce56831223 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:54:10 +0200
Subject: [PATCH 14/31] Add missing space character

---
 src/usage.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/usage.rs b/src/usage.rs
index b66d982..260d3fd 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -2,7 +2,7 @@ use getopts :: Options;
 
 pub fn usage (options: & Options) -> ()
 {
-    println ! ( "Usage: commit-analyzer <FILE> [OPTIONS]\n{}"
+    println ! ( "Usage:  commit-analyzer <FILE> [OPTIONS]\n{}"
               , options.usage ("Parses the output of `git log`.")
               );
     return;

From 383b3c2b1c92f62c8898d5ae08f163dd1cc54b5e Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:54:52 +0200
Subject: [PATCH 15/31] Document function

---
 src/usage.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/usage.rs b/src/usage.rs
index 260d3fd..4ebb89b 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -1,5 +1,11 @@
 use getopts :: Options;
 
+/// A small in-app documentation.
+///
+/// * `options` - The options the render the tool tips for.
+///
+/// This function will write a brief usage information, including a short
+/// introduction to the meaning of the configured options, to `stdout`.
 pub fn usage (options: & Options) -> ()
 {
     println ! ( "Usage:  commit-analyzer <FILE> [OPTIONS]\n{}"

From 0e6aa27e7e545ee481742a1c9d3654ebded944a4 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:56:03 +0200
Subject: [PATCH 16/31] Document source file

---
 src/usage.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/usage.rs b/src/usage.rs
index 4ebb89b..21d44a8 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -1,3 +1,12 @@
+//! The module for the usage advice.
+//!
+//! The usage advice defined in this module is specialised regarding the needs
+//! of this application.  This is,
+//!
+//! * the application name is hard coded,
+//! * the tool tip is hard coded, and
+//! * the expected order of arguments in the usage template is hard coded.
+
 use getopts :: Options;
 
 /// A small in-app documentation.

From df078425c8fc32cad195f78419808735db6e405d Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 19:57:34 +0200
Subject: [PATCH 17/31] Add missing parentheses

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 982a9af..06642be 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -87,7 +87,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             return Err(err.into());
         }
     };
-    if matches.opt_present ("h") || matches.free.len < 0x2
+    if matches.opt_present ("h") || matches.free.len () < 0x2
     {
         usage (opts);
         return Ok (());

From 3cf8f98b595c98740acf032a2d8bf6429171296b Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 20:01:11 +0200
Subject: [PATCH 18/31] Add new ignore pattern

---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitignore b/.gitignore
index 5162609..3991658 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /target
 *.txt
 *.csv
+*.log

From a7616157d1222410463da0ed5b0de414f40ccf6c Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Thu, 19 May 2022 20:01:48 +0200
Subject: [PATCH 19/31] Sort entries by alphabet

---
 .gitignore | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 3991658..f56489f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /target
-*.txt
 *.csv
 *.log
+*.txt

From 4b71ef4253dc5e616847531482d7dd9957126939 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <kevin.matthes@s2019.tu-chemnitz.de>
Date: Thu, 19 May 2022 20:36:02 +0200
Subject: [PATCH 20/31] Optimise code with `cargo fmt`

---
 src/main.rs  | 21 ++++++++++++++-------
 src/usage.rs | 12 ++++++------
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 06642be..2d0879b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,4 @@
-use crate :: usage :: usage;
+use crate::usage::usage;
 use std::{collections::HashMap, error::Error, io::Write, num::ParseIntError, ops::AddAssign};
 
 mod usage;
@@ -87,10 +87,9 @@ fn main() -> Result<(), Box<dyn Error>> {
             return Err(err.into());
         }
     };
-    if matches.opt_present ("h") || matches.free.len () < 0x2
-    {
-        usage (opts);
-        return Ok (());
+    if matches.opt_present("h") || matches.free.len() < 0x2 {
+        usage(opts);
+        return Ok(());
     };
     let is_quiet = matches.opt_present("q");
     let max_diff_hours: u32 = match matches.opt_str("duration").map(|str| str.parse()) {
@@ -239,7 +238,11 @@ impl Filter {
     }
 
     fn check_loc(&self, loc: &&Loc) -> bool {
-        self.file_extension.is_empty() || self.file_extension.iter().any(|ext| loc.file.ends_with(&format!(".{}", ext)))
+        self.file_extension.is_empty()
+            || self
+                .file_extension
+                .iter()
+                .any(|ext| loc.file.ends_with(&format!(".{}", ext)))
     }
 }
 
@@ -352,7 +355,11 @@ pub struct Commit {
 
 impl Commit {
     pub fn loc(&self, filter: &Filter) -> i64 {
-        self.locs.iter().filter(|l| filter.check_loc(l)).map(|l| l.loc()).sum()
+        self.locs
+            .iter()
+            .filter(|l| filter.check_loc(l))
+            .map(|l| l.loc())
+            .sum()
     }
 }
 
diff --git a/src/usage.rs b/src/usage.rs
index 21d44a8..293a7fe 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -7,7 +7,7 @@
 //! * the tool tip is hard coded, and
 //! * the expected order of arguments in the usage template is hard coded.
 
-use getopts :: Options;
+use getopts::Options;
 
 /// A small in-app documentation.
 ///
@@ -15,10 +15,10 @@ use getopts :: Options;
 ///
 /// This function will write a brief usage information, including a short
 /// introduction to the meaning of the configured options, to `stdout`.
-pub fn usage (options: & Options) -> ()
-{
-    println ! ( "Usage:  commit-analyzer <FILE> [OPTIONS]\n{}"
-              , options.usage ("Parses the output of `git log`.")
-              );
+pub fn usage(options: &Options) -> () {
+    println!(
+        "Usage:  commit-analyzer <FILE> [OPTIONS]\n{}",
+        options.usage("Parses the output of `git log`.")
+    );
     return;
 }

From 8d3226ddc1963fe7c929752c855c5c5bbdb58c33 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <kevin.matthes@s2019.tu-chemnitz.de>
Date: Thu, 19 May 2022 20:37:25 +0200
Subject: [PATCH 21/31] Apply linter suggestions

---
 src/usage.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/usage.rs b/src/usage.rs
index 293a7fe..2db161f 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -15,10 +15,9 @@ use getopts::Options;
 ///
 /// This function will write a brief usage information, including a short
 /// introduction to the meaning of the configured options, to `stdout`.
-pub fn usage(options: &Options) -> () {
+pub fn usage(options: &Options) {
     println!(
         "Usage:  commit-analyzer <FILE> [OPTIONS]\n{}",
         options.usage("Parses the output of `git log`.")
     );
-    return;
 }

From 84126f2d6880128f6b8aabc34d4dbe34ac30fc9f Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 15:49:22 +0200
Subject: [PATCH 22/31] Add accidentally forgotten newline whitespace

---
 src/usage.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/usage.rs b/src/usage.rs
index 2db161f..04f4ef9 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -17,7 +17,7 @@ use getopts::Options;
 /// introduction to the meaning of the configured options, to `stdout`.
 pub fn usage(options: &Options) {
     println!(
-        "Usage:  commit-analyzer <FILE> [OPTIONS]\n{}",
+        "Usage:  commit-analyzer <FILE> [OPTIONS]\n\n{}",
         options.usage("Parses the output of `git log`.")
     );
 }

From bf4adf5333858501a5c5bd195249db810fe596f6 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 15:52:12 +0200
Subject: [PATCH 23/31] Adjust function documentation

---
 src/usage.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/usage.rs b/src/usage.rs
index 04f4ef9..9c59b95 100644
--- a/src/usage.rs
+++ b/src/usage.rs
@@ -11,10 +11,8 @@ use getopts::Options;
 
 /// A small in-app documentation.
 ///
-/// * `options` - The options the render the tool tips for.
-///
 /// This function will write a brief usage information, including a short
-/// introduction to the meaning of the configured options, to `stdout`.
+/// introduction to the meaning of the configured `options`, to `stdout`.
 pub fn usage(options: &Options) {
     println!(
         "Usage:  commit-analyzer <FILE> [OPTIONS]\n\n{}",

From 6899b5f46b710d96a4b03476ab15287ba31828bc Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 15:55:11 +0200
Subject: [PATCH 24/31] Shorten the import of project related module

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 2d0879b..b150e8d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,5 @@
-use crate::usage::usage;
 use std::{collections::HashMap, error::Error, io::Write, num::ParseIntError, ops::AddAssign};
+use usage::usage;
 
 mod usage;
 

From ee1cdfabe7810deb3ebdb3c2ff3970bd0b00ccce Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 15:59:09 +0200
Subject: [PATCH 25/31] Revert hexadecimal representation

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index b150e8d..9e41488 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -87,7 +87,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             return Err(err.into());
         }
     };
-    if matches.opt_present("h") || matches.free.len() < 0x2 {
+    if matches.opt_present("h") || matches.free.len() < 2 {
         usage(opts);
         return Ok(());
     };

From 04d23968089eba70eda503fcab894bffd71a0b57 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 16:01:07 +0200
Subject: [PATCH 26/31] Remove obsolete semicolon

---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 9e41488..40b3812 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -90,7 +90,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     if matches.opt_present("h") || matches.free.len() < 2 {
         usage(opts);
         return Ok(());
-    };
+    }
     let is_quiet = matches.opt_present("q");
     let max_diff_hours: u32 = match matches.opt_str("duration").map(|str| str.parse()) {
         None => 3,

From fb72242f186c4c542631ec5ed25fa8b9fe2f8d43 Mon Sep 17 00:00:00 2001
From: Kevin Matthes <kevin.matthes@s2019.tu-chemnitz.de>
Date: Fri, 20 May 2022 16:31:27 +0200
Subject: [PATCH 27/31] Fix linter warnings with `cargo clippy --fix`

---
 src/main.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 40b3812..ff27639 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -323,7 +323,7 @@ fn parse_commit(commit: &str) -> Result<(Commit, &str), CommitParseError> {
         if loc.is_empty() || loc.starts_with("commit") {
             break;
         }
-        locs.push(Loc::parse(loc).map_err(|err| CommitParseError::LocFailed(err))?);
+        locs.push(Loc::parse(loc).map_err(CommitParseError::LocFailed)?);
         remainder_result = remainder;
         if let Some(remainder) = remainder_result.strip_prefix('\n') {
             remainder_result = remainder;
@@ -334,9 +334,9 @@ fn parse_commit(commit: &str) -> Result<(Commit, &str), CommitParseError> {
     let commit = Commit {
         commit: commit.into(),
         merge,
-        author: Author::parse(author).map_err(|err| CommitParseError::AuthorFailed(err))?,
+        author: Author::parse(author).map_err(CommitParseError::AuthorFailed)?,
         date: chrono::DateTime::parse_from_str(date, "%a %b %e %T %Y %z")
-            .map_err(|err| CommitParseError::DateFailed(err))?,
+            .map_err(CommitParseError::DateFailed)?,
         message: message.into(),
         locs,
     };
@@ -417,7 +417,7 @@ impl Loc {
             Some(
                 added
                     .parse()
-                    .map_err(|err| LocParseError::AddedParseError(err))?,
+                    .map_err(LocParseError::AddedParseError)?,
             )
         };
         let removed = if removed == "-" {
@@ -426,7 +426,7 @@ impl Loc {
             Some(
                 removed
                     .parse()
-                    .map_err(|err| LocParseError::RemovedParseError(err))?,
+                    .map_err(LocParseError::RemovedParseError)?,
             )
         };
         let file = file.into();

From 50ce6125c717c138588c0d6e46391fe17fbfd7ff Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 16:48:00 +0200
Subject: [PATCH 28/31] Move module import

---
 src/main.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main.rs b/src/main.rs
index ff27639..339b89c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,4 @@
+use getopts::Options;
 use std::{collections::HashMap, error::Error, io::Write, num::ParseIntError, ops::AddAssign};
 use usage::usage;
 

From 575ece76d71a7da67abac71a0995bcce092f81dd Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 16:50:44 +0200
Subject: [PATCH 29/31] Move function

---
 src/main.rs | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 339b89c..4e0122c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,5 @@
 use getopts::Options;
 use std::{collections::HashMap, error::Error, io::Write, num::ParseIntError, ops::AddAssign};
-use usage::usage;
-
-mod usage;
 
 fn main() -> Result<(), Box<dyn Error>> {
     let mut opts = getopts::Options::new();
@@ -181,6 +178,17 @@ fn main() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
+/// A small in-app documentation.
+///
+/// This function will write a brief usage information, including a short
+/// introduction to the meaning of the configured `options`, to `stdout`.
+fn usage(options: &Options) {
+    println!(
+        "Usage:  commit-analyzer <FILE> [OPTIONS]\n\n{}",
+        options.usage("Parses the output of `git log`.")
+    );
+}
+
 fn matches_filter(commit: &Commit, filter: &Filter) -> bool {
     filter.check_author_name(&commit.author.name)
         && filter.check_author_email(&commit.author.email)

From 750505d00f2bb437dc817eb3997575392a67abec Mon Sep 17 00:00:00 2001
From: Kevin Matthes <92332892+kevinmatthes@users.noreply.github.com>
Date: Fri, 20 May 2022 16:50:56 +0200
Subject: [PATCH 30/31] Delete usage.rs

---
 src/usage.rs | 21 ---------------------
 1 file changed, 21 deletions(-)
 delete mode 100644 src/usage.rs

diff --git a/src/usage.rs b/src/usage.rs
deleted file mode 100644
index 9c59b95..0000000
--- a/src/usage.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-//! The module for the usage advice.
-//!
-//! The usage advice defined in this module is specialised regarding the needs
-//! of this application.  This is,
-//!
-//! * the application name is hard coded,
-//! * the tool tip is hard coded, and
-//! * the expected order of arguments in the usage template is hard coded.
-
-use getopts::Options;
-
-/// A small in-app documentation.
-///
-/// This function will write a brief usage information, including a short
-/// introduction to the meaning of the configured `options`, to `stdout`.
-pub fn usage(options: &Options) {
-    println!(
-        "Usage:  commit-analyzer <FILE> [OPTIONS]\n\n{}",
-        options.usage("Parses the output of `git log`.")
-    );
-}

From bcedceef4959abdd80b930e4c620d834d87e574d Mon Sep 17 00:00:00 2001
From: Kevin Matthes <kevin.matthes@s2019.tu-chemnitz.de>
Date: Fri, 20 May 2022 16:56:41 +0200
Subject: [PATCH 31/31] Reformat code

---
 src/main.rs | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 4e0122c..49be9ec 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -423,20 +423,12 @@ impl Loc {
         let added = if added == "-" {
             None
         } else {
-            Some(
-                added
-                    .parse()
-                    .map_err(LocParseError::AddedParseError)?,
-            )
+            Some(added.parse().map_err(LocParseError::AddedParseError)?)
         };
         let removed = if removed == "-" {
             None
         } else {
-            Some(
-                removed
-                    .parse()
-                    .map_err(LocParseError::RemovedParseError)?,
-            )
+            Some(removed.parse().map_err(LocParseError::RemovedParseError)?)
         };
         let file = file.into();
         Ok(Self {