From fd854872ce86f9ae5d07ec59e598fe85a8607d5c Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Thu, 20 Oct 2022 18:32:30 +0300
Subject: fix: look up markdown file relative to basedir of subplot

This allows running docgen on a subplot that isn't in the current directory.

Sponsored-by: author
---
 src/bin/subplot.rs | 3 ++-
 src/metadata.rs    | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/bin/subplot.rs b/src/bin/subplot.rs
index a85ad62..8ede58d 100644
--- a/src/bin/subplot.rs
+++ b/src/bin/subplot.rs
@@ -278,7 +278,8 @@ impl Docgen {
         } else if let Some(date) = doc.meta().date() {
             date.to_string()
         } else {
-            Self::mtime_formatted(Self::mtime(doc.meta().markdown_filename())?)
+            let filename = doc.meta().basedir().join(doc.meta().markdown_filename());
+            Self::mtime_formatted(Self::mtime(&filename)?)
         };
         pandoc.add_option(pandoc::PandocOption::Meta("date".to_string(), Some(date)));
         pandoc.add_option(pandoc::PandocOption::TableOfContents);
diff --git a/src/metadata.rs b/src/metadata.rs
index dee0b50..261017a 100644
--- a/src/metadata.rs
+++ b/src/metadata.rs
@@ -12,6 +12,7 @@ use log::trace;
 /// Metadata of a document, as needed by Subplot.
 #[derive(Debug)]
 pub struct Metadata {
+    basedir: PathBuf,
     title: String,
     date: Option<String>,
     markdown_filename: PathBuf,
@@ -74,6 +75,7 @@ impl Metadata {
         trace!("Loaded all metadata successfully");
 
         Ok(Metadata {
+            basedir: basedir.as_ref().to_path_buf(),
             title,
             date,
             markdown_filename: meta.markdown().into(),
@@ -95,6 +97,11 @@ impl Metadata {
         self.date.as_deref()
     }
 
+    /// Return base dir for all relative filenames.
+    pub fn basedir(&self) -> &Path {
+        &self.basedir
+    }
+
     /// Return filename of the markdown file.
     pub fn markdown_filename(&self) -> &Path {
         &self.markdown_filename
-- 
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