feat(templates): Provide a consistent syntax for replacements

All replacements now start with `lpm::` and thus provide a future way to
extend them. This change also adds the ability to access the
chapter name in a new section and the current data in a new chapter.

8 files changed, 78 insertions, 62 deletions

diff --git a/example/main.tex b/example/example.tex
index d5f0d2f..d5f0d2f 100644
--- a/example/main.tex
+++ b/example/example.tex
diff --git a/example/lpm.toml b/example/lpm.toml
index 5a3565d..7c4aaad 100644
--- a/example/lpm.toml
+++ b/example/lpm.toml
@@ -1,19 +1,17 @@
-[last_chapter]
-user_name = "static"
-number = 0
+main_file = "example.tex"
 
 [templates]
 section = '''
-%! TEX root = ../../../main.tex
+%! TEX root = ../../../example.tex
 % LTeX: language=en-GB
 
-\section{REPLACMENT_SECTION_TITLE} % DATE
+\section{lpm::new_section_name} % lpm::current_date (lpm::current_chapter_name::title_case)
 This is some text
 '''
 
 chapter = '''
-%! TEX root = ../../main.tex
+%! TEX root = ../../example.tex
 % LTeX: language=en-GB
 
-\chapter{REPLACEMENT_CHAPTER}
+\chapter{lpm::new_chapter_name} % lpm::current_date
 '''
diff --git a/src/constants.rs b/src/constants.rs
new file mode 100644
index 0000000..2cdec2d
--- /dev/null
+++ b/src/constants.rs
@@ -0,0 +1,5 @@
+pub const REPLACEMENT_CHAPTER: &str = "lpm::new_chapter_name";
+
+pub const REPLACEMENT_CHAPTER_SECTION: &str = "lpm::current_chapter_name::title_case";
+pub const REPLACMENT_SECTION_TITLE: &str = "lpm::new_section_name";
+pub const DATE: &str = "lpm::current_date";
diff --git a/src/main.rs b/src/main.rs
index 5ea9a74..ce886bf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,6 +18,7 @@ pub mod bundle;
 pub mod cli;
 pub mod config_file;
 pub mod new;
+pub mod constants;
 
 // The copyright header tells you, where this file is from.
 pub mod file_tree;
diff --git a/src/new/chapter.rs b/src/new/chapter.rs
index 887855b..fcc075d 100644
--- a/src/new/chapter.rs
+++ b/src/new/chapter.rs
@@ -7,7 +7,7 @@ use crate::{
     file_tree::{FileTree, GeneratedFile},
 };
 
-use super::MangledName;
+use super::{replacement::untemplatize_chapter, MangledName};
 
 pub struct ChapterName {
     name: MangledName,
@@ -125,10 +125,7 @@ fn new_chapter_file(
     project_root: &Path,
     last_chapter_number: u32,
 ) -> GeneratedFile {
-    let chapter_text = config
-        .templates
-        .chapter
-        .replace("REPLACEMENT_CHAPTER", &name);
+    let chapter_text = untemplatize_chapter(&config.templates.chapter, &name);
 
     GeneratedFile::new(
         project_root
diff --git a/src/new/mod.rs b/src/new/mod.rs
index 8d8193c..04b75ef 100644
--- a/src/new/mod.rs
+++ b/src/new/mod.rs
@@ -4,6 +4,7 @@ use convert_case::{Case, Casing};
 use deunicode::deunicode;
 
 pub mod chapter;
+pub mod replacement;
 pub mod section;
 
 #[derive(PartialEq, Eq, PartialOrd, Ord)]
@@ -29,6 +30,10 @@ impl MangledName {
     pub fn as_str(&self) -> &str {
         &self.0
     }
+
+    pub fn try_unmangle(self) -> String {
+        self.0.to_case(Case::Title)
+    }
 }
 impl Display for MangledName {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
diff --git a/src/new/replacement.rs b/src/new/replacement.rs
new file mode 100644
index 0000000..6878e61
--- /dev/null
+++ b/src/new/replacement.rs
@@ -0,0 +1,47 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use chrono::{Local, TimeDelta, TimeZone};
+use log::debug;
+
+use crate::constants::{
+    DATE, REPLACEMENT_CHAPTER, REPLACEMENT_CHAPTER_SECTION, REPLACMENT_SECTION_TITLE,
+};
+
+fn get_current_date() -> String {
+    let start = SystemTime::now();
+    let seconds_since_epoch: TimeDelta = TimeDelta::from_std(
+        start
+            .duration_since(UNIX_EPOCH)
+            .expect("Time went backwards"),
+    )
+    .expect("Time does not go backwards");
+
+    debug!(
+        "Adding a date with timestamp: {}",
+        seconds_since_epoch.num_seconds()
+    );
+
+    let our_date = format!(
+        "{}",
+        Local
+            .timestamp_opt(seconds_since_epoch.num_seconds(), 0)
+            // only has unwrap, no expect. But should always work
+            .unwrap()
+            .format("%Y-%m-%d %H:%M:%S%.f %:z")
+    );
+
+    our_date
+}
+
+pub fn untemplatize_section(input: &str, new_section_name: &str, new_chapter_name: &str) -> String {
+    input
+        .replace(REPLACEMENT_CHAPTER_SECTION, &new_chapter_name)
+        .replace(REPLACMENT_SECTION_TITLE, &new_section_name)
+        .replace(DATE, &get_current_date())
+}
+
+pub fn untemplatize_chapter(input: &str, new_chapter_name: &str) -> String {
+    input
+        .replace(REPLACEMENT_CHAPTER, &new_chapter_name)
+        .replace(DATE, &get_current_date())
+}
diff --git a/src/new/section.rs b/src/new/section.rs
index 5e9f08c..a350f71 100644
--- a/src/new/section.rs
+++ b/src/new/section.rs
@@ -1,57 +1,14 @@
-use std::{
-    fs,
-    path::Path,
-    time::{SystemTime, UNIX_EPOCH},
-};
+use std::{fs, path::Path};
 
 use anyhow::Context;
-use chrono::{Local, TimeDelta, TimeZone};
 use log::debug;
 
 use crate::{
     config_file::Config,
     file_tree::{FileTree, GeneratedFile},
-    new::MangledName,
+    new::{replacement::untemplatize_section, MangledName},
 };
 
-fn get_current_date() -> String {
-    let start = SystemTime::now();
-    let seconds_since_epoch: TimeDelta = TimeDelta::from_std(
-        start
-            .duration_since(UNIX_EPOCH)
-            .expect("Time went backwards"),
-    )
-    .expect("Time does not go backwards");
-
-    debug!(
-        "Adding a date with timestamp: {}",
-        seconds_since_epoch.num_seconds()
-    );
-
-    let our_date = format!(
-        "{}",
-        Local
-            .timestamp_opt(seconds_since_epoch.num_seconds(), 0)
-            // only has unwrap, no expect. But should always work
-            .unwrap()
-            .format("%Y-%m-%d %H:%M:%S%.f %:z")
-    );
-
-    // let date = Command::new("date")
-    //     .args(["-d", &format!("@{}", seconds_since_epoch.num_seconds())])
-    //     .output()
-    //     .unwrap()
-    //     .stdout;
-
-    // info!(
-    //     "This is dated: '{}' vs. our date: '{}'",
-    //     String::from_utf8(date).unwrap().strip_suffix('\n').unwrap(),
-    //     our_date
-    // );
-
-    our_date
-}
-
 pub fn generate_new_section(
     config: &Config,
     name: String,
@@ -63,11 +20,17 @@ pub fn generate_new_section(
 
     let mut file_tree = FileTree::new();
 
-    let new_section_text = config
-        .templates
-        .section
-        .replace("REPLACMENT_SECTION_TITLE", &name)
-        .replace("DATE", &get_current_date());
+    let display_chapter_name = MangledName::from_str_unsafe(
+        chapter_name
+            .chars()
+            .skip_while(|a: &char| a.is_digit(10) || *(a) == '_')
+            .collect::<String>()
+            .as_str(),
+    )
+    .try_unmangle();
+
+    let new_section_text =
+        untemplatize_section(&config.templates.section, &name, &display_chapter_name);
 
     file_tree.add_file(GeneratedFile::new_clobber(
         chapter_root