From d14bf14d4bb0a7fbbd5ea0b1ac42debbf4b249a4 Mon Sep 17 00:00:00 2001
From: Christine Dodrill <me@christine.website>
Date: Sun, 31 May 2020 12:29:43 -0400
Subject: [PATCH] implement changelog parsing

---
 CHANGELOG.md     | 41 ++++++++++++++++++++++++++
 src/changelog.rs | 75 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs      |  1 +
 3 files changed, 117 insertions(+)
 create mode 100644 CHANGELOG.md
 create mode 100644 src/changelog.rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..ade8418
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,41 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+## 0.1.0
+
+This is the first release of `gitea-release`!
+
+```console
+$ gitea-release release --help
+gitea-release-release 0.1.0
+Create a new tag and release on Gitea
+
+USAGE:
+    gitea-release release [FLAGS] [OPTIONS] --auth-user <auth-user> --owner <owner> --repo <repo> --server <server> --token <token>
+
+FLAGS:
+        --draft          Draft release
+    -h, --help           Prints help information
+    -p, --pre-release    Pre-release (not suitable for production)
+    -V, --version        Prints version information
+
+OPTIONS:
+    -a, --auth-user <auth-user>    The gitea user to authenticate as [env: GITEA_AUTH_USER=cadey]
+    -c, --changelog <changelog>    Changelog file to read from to create the release description [default:
+                                   ./CHANGELOG.md]
+    -n, --name <name>              Release name
+    -o, --owner <owner>            The owner of the gitea repo [env: GITEA_OWNER=]
+    -r, --repo <repo>              The gitea repo to operate on [env: GITEA_REPO=]
+    -s, --server <server>          The gitea server to connect to [env: GITEA_SERVER=https://tulpa.dev]
+        --token <token>            The gitea token to authenticate with [env: GITEA_TOKEN=]
+```
+
+### ADDED
+
+- Basic functionality
+
diff --git a/src/changelog.rs b/src/changelog.rs
new file mode 100644
index 0000000..2ff75c5
--- /dev/null
+++ b/src/changelog.rs
@@ -0,0 +1,75 @@
+use anyhow::Result;
+use comrak::nodes::{AstNode, NodeValue};
+use comrak::{format_commonmark, parse_document, Arena, ComrakOptions};
+use std::cell::RefCell;
+use std::fs::read_to_string;
+use std::path::PathBuf;
+
+pub(crate) fn read(fname: PathBuf, tag: String) -> Result<String> {
+    let data = read_to_string(fname)?;
+    let arena = Arena::new();
+    let mut root = parse_document(&arena, &data, &ComrakOptions::default());
+
+    let collect = RefCell::new(false);
+    let buf = RefCell::new(Vec::<u8>::new());
+
+    iter_nodes(&mut root, &|node| {
+        let nd = node.data.borrow();
+
+        match nd.value {
+            NodeValue::Heading(ref hdr) => {
+                if hdr.level == 2 {
+                    if *collect.borrow() {
+                        collect.swap(&RefCell::new(false));
+                    }
+
+                    let found_tag = String::from_utf8(nd.content.clone())?;
+
+                    if found_tag == tag {
+                        collect.swap(&RefCell::new(true));
+                    }
+                } else {
+                    if *collect.borrow() {
+                        let mut apd = buf.borrow_mut();
+                        let mut new_buf = Vec::<u8>::new();
+                        format_commonmark(&node, &ComrakOptions::default(), &mut new_buf)?;
+                        apd.append(&mut new_buf);
+                    }
+                }
+                Ok(())
+            }
+            NodeValue::Item(_) => Ok(()),
+            _ => {
+                if *collect.borrow() {
+                    let mut apd = buf.borrow_mut();
+                    let mut new_buf = Vec::<u8>::new();
+                    format_commonmark(&node, &ComrakOptions::default(), &mut new_buf)?;
+                    apd.append(&mut new_buf);
+                }
+
+                Ok(())
+            }
+        }
+    })?;
+
+    Ok(String::from_utf8(buf.into_inner())?)
+}
+
+fn iter_nodes<'a, F>(node: &'a AstNode<'a>, f: &F) -> Result<()>
+where
+    F: Fn(&'a AstNode<'a>) -> Result<()>,
+{
+    f(node)?;
+    for c in node.children() {
+        match c.data.borrow().value {
+            NodeValue::Text(_) => {}
+            NodeValue::Item(_) => {}
+            NodeValue::Code(_) => {}
+            _ => {
+                iter_nodes(c, f)?;
+            }
+        }
+    }
+
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
index 46fd936..7bd2bcc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@ use reqwest::{header, Client};
 use std::path::PathBuf;
 use structopt::StructOpt;
 
+mod changelog;
 mod cmd;
 mod gitea;