From e9192145cdf1294c249c7e6d7098dd88ca4cfa49 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 21 Mar 2021 20:29:02 +0000
Subject: [PATCH] shapelib: Support desc_template

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/shapelib-toml.rs | 5 +++++
 src/shapelib.rs      | 7 ++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/shapelib-toml.rs b/src/shapelib-toml.rs
index f9f619fa..d5042bd6 100644
--- a/src/shapelib-toml.rs
+++ b/src/shapelib-toml.rs
@@ -134,6 +134,11 @@ pub struct GroupDetails {
   #[serde(default)]
   pub colours: HashMap<String, RecolourData>,
 
+  /// If specified, provides a template for the description.  The
+  /// description previously calculated replaces `_desc` in this
+  /// string.
+  pub desc_template: Option<String>,
+
   /// If specified, pieces in this group can be occulted.
   pub occulted: Option<OccultationMethod>,
 
diff --git a/src/shapelib.rs b/src/shapelib.rs
index 399c2a8c..708d48a9 100644
--- a/src/shapelib.rs
+++ b/src/shapelib.rs
@@ -491,7 +491,12 @@ fn load_catalogue(libname: &str, dirname: &str, toml_path: &str) -> Contents {
         },
       };
 
-      let mut add1 = |item_name: &str, desc| {
+      let mut add1 = |item_name: &str, desc: Html| {
+        let desc = if let Some(desc_template) = &group.d.desc_template {
+          Html(subst(desc_template, "_desc", &desc.0)?)
+        } else {
+          desc
+        };
         let idata = ItemData {
           group: group.clone(),
           occ: occ.clone(),
-- 
2.30.2