From 6f5e00885312f040668fd97319fbfe08ed1fb5d2 Mon Sep 17 00:00:00 2001
From: Vincent Prouillet <vincent@wearewizards.io>
Date: Wed, 3 May 2017 23:16:09 +0900
Subject: [PATCH] Add global get_page tera fn

---
 Cargo.lock        |  8 ++++----
 src/global_fns.rs | 29 +++++++++++++++++++++++++++++
 src/lib.rs        |  2 ++
 src/site.rs       |  3 +++
 4 files changed, 38 insertions(+), 4 deletions(-)
 create mode 100644 src/global_fns.rs

diff --git a/Cargo.lock b/Cargo.lock
index 5737d73a..1313da34 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,7 +19,7 @@ dependencies = [
  "staticfile 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "syntect 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "tera 0.10.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tera 0.10.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "term-painter 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.0 (git+https://github.com/alexcrichton/toml-rs)",
  "walkdir 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -820,7 +820,7 @@ dependencies = [
 
 [[package]]
 name = "tera"
-version = "0.10.3"
+version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "chrono 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -895,7 +895,7 @@ dependencies = [
 [[package]]
 name = "toml"
 version = "0.4.0"
-source = "git+https://github.com/alexcrichton/toml-rs#58f51ef03b88e06745c4113e13ea2738e1af247d"
+source = "git+https://github.com/alexcrichton/toml-rs#f94dc8d69b22f330e6be19882f2f02e09895f18f"
 dependencies = [
  "serde 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1165,7 +1165,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum syntect 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "24204b1f4bdd49f84e5f4b219d0bf1dc45ac2fd7fc46320ab6627b537d6d4b69"
 "checksum tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "87974a6f5c1dfb344d733055601650059a3363de2a6104819293baff662132d6"
-"checksum tera 0.10.3 (registry+https://github.com/rust-lang/crates.io-index)" = "86bc1156f5502b5eb3904348f4bea155d728e51fec7c981c44b3f1d10b8e574b"
+"checksum tera 0.10.4 (registry+https://github.com/rust-lang/crates.io-index)" = "5d440e681b91b057dcaa4d49d7e04af824d0d0769e8c5d21ebb8fc86f7c4b3b7"
 "checksum term 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "d168af3930b369cfe245132550579d47dfd873d69470755a19c2c6568dbbd989"
 "checksum term-painter 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ab900bf2f05175932b13d4fc12f8ff09ef777715b04998791ab2c930841e496b"
 "checksum term_size 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2b6b55df3198cc93372e85dd2ed817f0e38ce8cc0f22eb32391bfad9c4bf209"
diff --git a/src/global_fns.rs b/src/global_fns.rs
new file mode 100644
index 00000000..3205378a
--- /dev/null
+++ b/src/global_fns.rs
@@ -0,0 +1,29 @@
+use std::collections::HashMap;
+use std::path::{PathBuf};
+
+use tera::{GlobalFn, Value, from_value, to_value, Result};
+
+use page::Page;
+
+
+pub fn make_get_page(all_pages: &HashMap<PathBuf, Page>) -> GlobalFn {
+    let mut pages = HashMap::new();
+    for page in all_pages.values() {
+        pages.insert(page.relative_path.clone(), page.clone());
+    }
+
+    Box::new(move |args| -> Result<Value> {
+        match args.get("path") {
+            Some(val) => match from_value::<String>(val.clone()) {
+                Ok(v) => {
+                    match pages.get(&v) {
+                        Some(p) => Ok(to_value(p).unwrap()),
+                        None => Err(format!("Page `{}` not found.", v).into())
+                    }
+                },
+                Err(_) => Err(format!("`get_page` received path={:?} but it requires a string", val).into()),
+            },
+            None => Err("`get_page` requires a `path` argument.".into()),
+        }
+    })
+}
diff --git a/src/lib.rs b/src/lib.rs
index 5965712e..6e79fbb2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,6 +30,8 @@ mod section;
 mod pagination;
 /// Additional filters for Tera
 mod filters;
+/// Global fns for Tera
+mod global_fns;
 
 pub use site::{Site, GUTENBERG_TERA};
 pub use config::{Config, get_config};
diff --git a/src/site.rs b/src/site.rs
index 27d2373d..47a6b6cc 100644
--- a/src/site.rs
+++ b/src/site.rs
@@ -16,6 +16,7 @@ use utils::{create_file, create_directory};
 use section::{Section};
 use front_matter::{SortBy};
 use filters;
+use global_fns;
 
 
 lazy_static! {
@@ -191,6 +192,8 @@ impl Site {
         self.populate_sections();
         self.populate_tags_and_categories();
 
+        self.tera.register_global_function("get_page", global_fns::make_get_page(&self.pages));
+
         Ok(())
     }