add section info struct with computed values

Closes #13

src/domain.rs

@@ -43,3 +43,8 @@ impl Section {
             .map_or_else(|| Self::new(s), |(ns, name)| Self::with_namespace(ns, name))
     }
 }
+
+struct SectionInfo {
+    enable_variable: bool,
+    disable_variable: bool,
+}

src/domain/switch.rs

@@ -16,7 +16,7 @@
 
 use std::io::{BufWriter, Write};
 
-use super::Section;
+use super::{Section, SectionInfo};
 
 #[derive(Debug)]
 pub enum Error {
@@ -54,25 +54,27 @@ where
         .map(|s| Section::parse(s.as_str()))
         .collect::<Vec<_>>();
 
-    let mut current_sections: Option<Vec<Section>> = None;
+    let mut current_sections: Option<SectionInfo> = None;
 
     for line in req.content.split_inclusive('\n') {
         let new_line = if is_section_end(line) {
             current_sections = None;
             line.to_string()
         } else if let Some(section_info) = line.strip_prefix("### ") {
-            current_sections = section_info
-                .split_whitespace()
-                .next()
-                .map(|r| r.split(',').map(Section::parse).collect());
+            current_sections = section_info.split_whitespace().next().map(|r| {
+                let current_sections = r.split(',').map(Section::parse).collect::<Vec<_>>();
+                SectionInfo {
+                    enable_variable: should_enable_variable(&choose_sections, &current_sections),
+                    disable_variable: should_disable_variable(&choose_sections, &current_sections),
+                }
+            });
             line.to_string()
-        } else if let Some(cur_sections) = current_sections.clone() {
+        } else if let Some(section_info) = current_sections.as_ref() {
             let trimmed_line = line.trim_start_matches(['#', ' ']);
-            if !is_variables(trimmed_line) {
-                line.to_string()
-            } else if should_enable_variable(&choose_sections, &cur_sections) {
+            let is_var = is_variable(trimmed_line);
+            if is_var && section_info.enable_variable {
                 String::from(trimmed_line)
-            } else if should_disable_variable(&choose_sections, &cur_sections) {
+            } else if is_var && section_info.disable_variable {
                 format!("# {}", trimmed_line)
             } else {
                 line.to_string()
@@ -89,7 +91,7 @@ where
     writer.flush().map_err(|_| Error::WriteData)
 }
 
-fn is_variables(trimmed_line: &str) -> bool {
+fn is_variable(trimmed_line: &str) -> bool {
     trimmed_line
         .chars()
         .filter(|ch| (*ch != '_' && ch.is_ascii_punctuation()) || ch.is_whitespace())
@@ -297,7 +299,7 @@ mod tests {
             ];
 
             for (input, expected) in test_cases {
-                assert_eq!(is_variables(input), expected);
+                assert_eq!(is_variable(input), expected);
             }
         }
     }