lint: use Self when suitable

Changes done by `cargo clippy --fix -- -D clippy::use_self`

src/format/mod.rs

@@ -20,8 +20,8 @@ pub struct F64Formatter {
 
 impl F64Formatter {
     /// Initializes a new `HumanF64Formatter` with default values.
-    pub fn new(decimals: usize) -> F64Formatter {
-        F64Formatter {
+    pub fn new(decimals: usize) -> Self {
+        Self {
             decimals,
             divisor: 0,
             suffix: "".to_owned(),
@@ -30,14 +30,14 @@ impl F64Formatter {
 
     /// Initializes a new `HumanF64Formatter` for formatting numbers in the
     /// provided range.
-    pub fn new_with_range(range: Range<f64>) -> F64Formatter {
+    pub fn new_with_range(range: Range<f64>) -> Self {
         // Range
         let mut decimals = 3;
         let mut divisor = 0_u8;
         let mut suffix = UNITS[0].to_owned();
         let difference = range.end - range.start;
         if difference == 0.0 {
-            return F64Formatter {
+            return Self {
                 decimals,
                 divisor,
                 suffix,
@@ -51,7 +51,7 @@ impl F64Formatter {
             divisor = ((log - 1) / 3).min(5) as u8;
         }
         suffix = UNITS[divisor as usize].to_owned();
-        F64Formatter {
+        Self {
             decimals,
             divisor,
             suffix,
@@ -74,8 +74,8 @@ pub struct HorizontalScale {
 }
 
 impl HorizontalScale {
-    pub fn new(scale: usize) -> HorizontalScale {
-        HorizontalScale {
+    pub fn new(scale: usize) -> Self {
+        Self {
             scale: 1.max(scale),
         }
     }

src/plot/histogram.rs

@@ -14,8 +14,8 @@ struct Bucket {
 }
 
 impl Bucket {
-    fn new(range: Range<f64>) -> Bucket {
-        Bucket { range, count: 0 }
+    fn new(range: Range<f64>) -> Self {
+        Self { range, count: 0 }
     }
 
     fn inc(&mut self) {
@@ -63,12 +63,12 @@ impl Histogram {
     /// `precision` is an Option with the number of decimals to display.  If
     /// "None" is used, human units will be used, with an heuristic based on the
     /// input data for deciding the units and the decimal places.
-    pub fn new(vec: &[f64], mut options: HistogramOptions) -> Histogram {
+    pub fn new(vec: &[f64], mut options: HistogramOptions) -> Self {
         options.intervals = options.intervals.min(vec.len());
         let stats = Stats::new(vec, options.precision);
         let size = options.intervals.min(vec.len());
         let step = (stats.max - stats.min) / size as f64;
-        let mut histogram = Histogram::new_with_stats(step, stats, options);
+        let mut histogram = Self::new_with_stats(step, stats, options);
         histogram.load(vec);
         histogram
     }
@@ -79,14 +79,14 @@ impl Histogram {
     /// Parameters are similar to those on the `new` method, but a parameter
     /// named `stats` is needed to decide how future data (to be injected with
     /// the load method) will be accommodated.
-    pub fn new_with_stats(step: f64, stats: Stats, options: HistogramOptions) -> Histogram {
+    pub fn new_with_stats(step: f64, stats: Stats, options: HistogramOptions) -> Self {
         let mut vec = Vec::<Bucket>::with_capacity(options.intervals);
         let mut lower = stats.min;
         for _ in 0..options.intervals {
             vec.push(Bucket::new(lower..lower + step));
             lower += step;
         }
-        Histogram {
+        Self {
             vec,
             max: stats.min + (step * options.intervals as f64),
             step,

src/plot/matchbar.rs

@@ -13,8 +13,8 @@ pub struct MatchBarRow {
 }
 
 impl MatchBarRow {
-    pub fn new(string: &str) -> MatchBarRow {
-        MatchBarRow {
+    pub fn new(string: &str) -> Self {
+        Self {
             label: string.to_string(),
             count: 0,
         }
@@ -38,14 +38,14 @@ pub struct MatchBar {
 
 impl MatchBar {
     /// Creates a Histogram from a vector of `MatchBarRow` elements.
-    pub fn new(vec: Vec<MatchBarRow>) -> MatchBar {
+    pub fn new(vec: Vec<MatchBarRow>) -> Self {
         let mut top_lenght: usize = 0;
         let mut top_values: usize = 0;
         for row in vec.iter() {
             top_lenght = top_lenght.max(row.label.len());
             top_values = top_values.max(row.count);
         }
-        MatchBar {
+        Self {
             vec,
             top_values,
             top_lenght,

src/plot/splittimehist.rs

@@ -15,8 +15,8 @@ struct TimeBucket {
 }
 
 impl TimeBucket {
-    fn new(start: DateTime<FixedOffset>, counts: usize) -> TimeBucket {
-        TimeBucket {
+    fn new(start: DateTime<FixedOffset>, counts: usize) -> Self {
+        Self {
             start,
             count: vec![0; counts],
         }
@@ -52,11 +52,7 @@ impl SplitTimeHistogram {
     /// `size` is the number of time slots in the histogram.  Parameter 'ts' is
     /// a slice of tuples of `DateTime` (the timestamp of a term occurrence) and
     /// the index of the term in the `strings` parameter.
-    pub fn new(
-        size: usize,
-        strings: Vec<String>,
-        ts: &[(DateTime<FixedOffset>, usize)],
-    ) -> SplitTimeHistogram {
+    pub fn new(size: usize, strings: Vec<String>, ts: &[(DateTime<FixedOffset>, usize)]) -> Self {
         let mut vec = Vec::<TimeBucket>::with_capacity(size);
         let min = ts.iter().min().unwrap().0;
         let max = ts.iter().max().unwrap().0;
@@ -65,7 +61,7 @@ impl SplitTimeHistogram {
         for i in 0..size {
             vec.push(TimeBucket::new(min + (inc * i as i32), strings.len()));
         }
-        let mut sth = SplitTimeHistogram {
+        let mut sth = Self {
             vec,
             strings,
             min,

src/plot/terms.rs

@@ -20,8 +20,8 @@ impl CommonTerms {
     /// Create and empty `CommonTerms`.
     ///
     /// `lines` is the number of lines to be displayed.
-    pub fn new(lines: usize) -> CommonTerms {
-        CommonTerms {
+    pub fn new(lines: usize) -> Self {
+        Self {
             terms: HashMap::new(),
             lines,
         }

src/plot/timehist.rs

@@ -13,8 +13,8 @@ struct TimeBucket {
 }
 
 impl TimeBucket {
-    fn new(start: DateTime<FixedOffset>) -> TimeBucket {
-        TimeBucket { start, count: 0 }
+    fn new(start: DateTime<FixedOffset>) -> Self {
+        Self { start, count: 0 }
     }
 
     fn inc(&mut self) {
@@ -38,7 +38,7 @@ impl TimeHistogram {
     /// Creates a Histogram from a vector of `DateTime` elements.
     ///
     /// `size` is the number of histogram buckets to display.
-    pub fn new(size: usize, ts: &[DateTime<FixedOffset>]) -> TimeHistogram {
+    pub fn new(size: usize, ts: &[DateTime<FixedOffset>]) -> Self {
         let mut vec = Vec::<TimeBucket>::with_capacity(size);
         let min = *ts.iter().min().unwrap();
         let max = *ts.iter().max().unwrap();
@@ -47,7 +47,7 @@ impl TimeHistogram {
         for i in 0..size {
             vec.push(TimeBucket::new(min + (inc * i as i32)));
         }
-        let mut timehist = TimeHistogram {
+        let mut timehist = Self {
             vec,
             min,
             max,

src/plot/xy.rs

@@ -31,8 +31,8 @@ impl XyPlot {
     /// `precision` is an Option with the number of decimals to display.  If
     /// "None" is used, human units will be used, with an heuristic based on the
     /// input data for deciding the units and the decimal places.
-    pub fn new(vec: &[f64], width: usize, height: usize, precision: Option<usize>) -> XyPlot {
-        let mut plot = XyPlot::new_with_stats(width, height, Stats::new(vec, precision), precision);
+    pub fn new(vec: &[f64], width: usize, height: usize, precision: Option<usize>) -> Self {
+        let mut plot = Self::new_with_stats(width, height, Stats::new(vec, precision), precision);
         plot.load(vec);
         plot
     }
@@ -47,8 +47,8 @@ impl XyPlot {
         height: usize,
         stats: Stats,
         precision: Option<usize>,
-    ) -> XyPlot {
-        XyPlot {
+    ) -> Self {
+        Self {
             x_axis: Vec::with_capacity(width),
             y_axis: Vec::with_capacity(height),
             width,

src/read/dateparser.rs

@@ -28,14 +28,14 @@ pub struct LogDateParser {
 }
 
 impl LogDateParser {
-    pub fn new(log_line: &str, format_string: &Option<String>) -> Result<LogDateParser, String> {
+    pub fn new(log_line: &str, format_string: &Option<String>) -> Result<Self, String> {
         match format_string {
             Some(ts_format) => Self::new_with_format(log_line, ts_format),
             None => Self::new_with_guess(log_line),
         }
     }
 
-    fn new_with_guess(log_line: &str) -> Result<LogDateParser, String> {
+    fn new_with_guess(log_line: &str) -> Result<Self, String> {
         // All the guess work assume that datetimes start with a digit, and that
         // digit is the first digit in the log line.  The approach is to locate
         // the 1st digit and then try to parse as much text as possible with any
@@ -45,7 +45,7 @@ impl LogDateParser {
             if c.is_ascii_digit() {
                 for j in (i..(i + MAX_LEN).min(log_line.len() + 1)).rev() {
                     if let Some(parser) = Self::guess_parser(&log_line[i..j]) {
-                        return Ok(LogDateParser {
+                        return Ok(Self {
                             range: i..j,
                             parser,
                         });
@@ -57,14 +57,14 @@ impl LogDateParser {
         Err(format!("Could not parse a timestamp in {}", log_line))
     }
 
-    fn new_with_format(log_line: &str, format_string: &str) -> Result<LogDateParser, String> {
+    fn new_with_format(log_line: &str, format_string: &str) -> Result<Self, String> {
         // We look for where the timestamp is in logs using a brute force
         // approach with 1st log line, but capping the max length we scan for
         for i in 0..log_line.len() {
             for j in (i..(i + (MAX_LEN * 2)).min(log_line.len() + 1)).rev() {
                 if NaiveDateTime::parse_from_str(&log_line[i..j], format_string).is_ok() {
                     let fmt = Box::new(format_string.to_string());
-                    return Ok(LogDateParser {
+                    return Ok(Self {
                         range: i..j,
                         parser: Box::new(move |string: &str| {
                             match NaiveDateTime::parse_from_str(string, &fmt) {

src/stats/mod.rs

@@ -29,7 +29,7 @@ impl Stats {
     /// `precision` is an Option with the number of decimals to display.  If
     /// "None" is used, human units will be used, with an heuristic based on the
     /// input data for deciding the units and the decimal places.
-    pub fn new(vec: &[f64], precision: Option<usize>) -> Stats {
+    pub fn new(vec: &[f64], precision: Option<usize>) -> Self {
         let mut max = vec[0];
         let mut min = max;
         let mut temp: f64 = 0.0;
@@ -42,7 +42,7 @@ impl Stats {
         }
         let var = temp / vec.len() as f64;
         let std = var.sqrt();
-        Stats {
+        Self {
             min,
             max,
             avg,