(doc): Remove use of mut in Document method receivers where possible

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 6 insertions, 9 deletions

diff --git a/src/doc.rs b/src/doc.rs
index 349e1f3..0e85dcc 100644
--- a/src/doc.rs
+++ b/src/doc.rs
@@ -155,7 +155,7 @@ impl Document {
     ///
     /// This is useful in a Pandoc filter, so that the filter can give
     /// it back to Pandoc for typesetting.
-    pub fn ast(&mut self) -> Result<String, SubplotError> {
+    pub fn ast(&self) -> Result<String, SubplotError> {
         self.md.to_json()
     }
 
@@ -168,7 +168,7 @@ impl Document {
     ///
     /// The sources are any files that affect the output so that if
     /// the source file changes, the output needs to be re-generated.
-    pub fn sources(&mut self, template: Option<&str>) -> Vec<PathBuf> {
+    pub fn sources(&self, template: Option<&str>) -> Vec<PathBuf> {
         let mut names = vec![self.subplot.clone()];
 
         for x in self.meta().bindings_filenames() {
@@ -209,7 +209,7 @@ impl Document {
     }
 
     /// Check the document for common problems.
-    pub fn lint(&mut self) -> Result<(), SubplotError> {
+    pub fn lint(&self) -> Result<(), SubplotError> {
         trace!("Linting document");
         self.check_doc_has_title()?;
         self.check_filenames_are_unique()?;
@@ -240,7 +240,7 @@ impl Document {
     }
 
     /// Check that all the block classes in the document are known
-    fn check_block_classes(&mut self) -> Result<(), SubplotError> {
+    fn check_block_classes(&self) -> Result<(), SubplotError> {
         let classes_in_doc = self.md.block_classes();
 
         // Build the set of known good classes
@@ -367,15 +367,12 @@ impl Document {
     }
 
     /// Return all scenarios in a document.
-    pub fn scenarios(&mut self) -> Result<Vec<Scenario>, SubplotError> {
+    pub fn scenarios(&self) -> Result<Vec<Scenario>, SubplotError> {
         self.md.scenarios()
     }
 
     /// Return matched scenarios in a document.
-    pub fn matched_scenarios(
-        &mut self,
-        template: &str,
-    ) -> Result<Vec<MatchedScenario>, SubplotError> {
+    pub fn matched_scenarios(&self, template: &str) -> Result<Vec<MatchedScenario>, SubplotError> {
         let scenarios = self.scenarios()?;
         trace!(
             "Found {} scenarios, checking their bindings",