Reorganize layout and rendering code

src/cli/show.rs

@@ -0,0 +1,118 @@
+use chrono::{Datelike, NaiveDate};
+
+use crate::files::primitives::{Time, Weekday};
+
+use super::layout::line::{LineEntry, LineLayout, SpanSegment};
+
+struct ShowLines {
+    num_width: usize,
+    span_width: usize,
+    result: String,
+}
+
+impl ShowLines {
+    fn new(num_width: usize, span_width: usize) -> Self {
+        Self {
+            num_width,
+            span_width,
+            result: String::new(),
+        }
+    }
+
+    fn display_line(&mut self, line: &LineEntry) {
+        match line {
+            LineEntry::Day { spans, date } => self.display_line_date(spans, *date),
+            LineEntry::Now { spans, time } => self.display_line_now(spans, *time),
+            LineEntry::Entry {
+                number,
+                spans,
+                time,
+                text,
+            } => self.display_line_entry(*number, spans, *time, text),
+        }
+    }
+
+    fn display_line_date(&mut self, spans: &[Option<SpanSegment>], date: NaiveDate) {
+        let weekday: Weekday = date.weekday().into();
+        let weekday = weekday.full_name();
+        self.push(&format!(
+            "{:=>nw$}={:=<sw$}===  {:9}  {}  ==={:=<sw$}={:=>nw$}\n",
+            "",
+            Self::display_spans(spans, '='),
+            weekday,
+            date,
+            "",
+            "",
+            nw = self.num_width,
+            sw = self.span_width
+        ));
+    }
+
+    fn display_line_now(&mut self, spans: &[Option<SpanSegment>], time: Time) {
+        self.push(&format!(
+            "{:<nw$} {:sw$} {}\n",
+            "now",
+            Self::display_spans(spans, ' '),
+            time,
+            nw = self.num_width,
+            sw = self.span_width
+        ));
+    }
+
+    fn display_line_entry(
+        &mut self,
+        number: Option<usize>,
+        spans: &[Option<SpanSegment>],
+        time: Option<Time>,
+        text: &str,
+    ) {
+        let num = match number {
+            Some(n) => format!("{}", n),
+            None => "".to_string(),
+        };
+
+        let time = match time {
+            Some(t) => format!("{} ", t),
+            None => "".to_string(),
+        };
+
+        self.push(&format!(
+            "{:>nw$} {:sw$} {}{}\n",
+            num,
+            Self::display_spans(spans, ' '),
+            time,
+            text,
+            nw = self.num_width,
+            sw = self.span_width
+        ))
+    }
+
+    fn display_spans(spans: &[Option<SpanSegment>], empty: char) -> String {
+        let mut result = String::new();
+        for segment in spans {
+            result.push(match segment {
+                Some(SpanSegment::Start) => '┌',
+                Some(SpanSegment::Middle) => '│',
+                Some(SpanSegment::End) => '└',
+                None => empty,
+            });
+        }
+        result
+    }
+
+    fn push(&mut self, line: &str) {
+        self.result.push_str(line);
+    }
+
+    fn result(self) -> String {
+        self.result
+    }
+}
+
+pub fn show_all(layout: &LineLayout) -> String {
+    let mut show_lines = ShowLines::new(layout.num_width(), layout.span_width());
+    for line in layout.lines() {
+        show_lines.display_line(line);
+    }
+    show_lines.result()
+}