From f06a29f6e1fed49c0e817e669b77f3110ef84d6c Mon Sep 17 00:00:00 2001
From: Noritada Kobayashi <noritada.kobayashi@gmail.com>
Date: Sun, 11 Dec 2022 23:49:28 +0900
Subject: [PATCH] Implement `xtask publish-release-notes` to publish release
 notes on GitHub Releases

---
 xtask/src/flags.rs   | 15 +++++++++
 xtask/src/main.rs    |  2 ++
 xtask/src/publish.rs | 80 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 97 insertions(+)
 create mode 100644 xtask/src/publish.rs

diff --git a/xtask/src/flags.rs b/xtask/src/flags.rs
index 0fce488983..2100479701 100644
--- a/xtask/src/flags.rs
+++ b/xtask/src/flags.rs
@@ -34,6 +34,13 @@ xflags::xflags! {
         cmd dist {
             optional --client-patch-version version: String
         }
+        /// Read a changelog AsciiDoc file and update the GitHub Releases entry in Markdown.
+        cmd publish-release-notes {
+            /// Only run conversion and show the result.
+            optional --dry-run
+            /// Target changelog file.
+            required changelog: String
+        }
         cmd metrics {
             optional --dry-run
         }
@@ -59,6 +66,7 @@ pub enum XtaskCmd {
     Release(Release),
     Promote(Promote),
     Dist(Dist),
+    PublishReleaseNotes(PublishReleaseNotes),
     Metrics(Metrics),
     Bb(Bb),
 }
@@ -90,6 +98,13 @@ pub struct Dist {
     pub client_patch_version: Option<String>,
 }
 
+#[derive(Debug)]
+pub struct PublishReleaseNotes {
+    pub changelog: String,
+
+    pub dry_run: bool,
+}
+
 #[derive(Debug)]
 pub struct Metrics {
     pub dry_run: bool,
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index a37f469adc..6a45033ada 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -15,6 +15,7 @@ mod flags;
 mod install;
 mod release;
 mod dist;
+mod publish;
 mod metrics;
 
 use anyhow::bail;
@@ -36,6 +37,7 @@ fn main() -> anyhow::Result<()> {
         flags::XtaskCmd::Release(cmd) => cmd.run(sh),
         flags::XtaskCmd::Promote(cmd) => cmd.run(sh),
         flags::XtaskCmd::Dist(cmd) => cmd.run(sh),
+        flags::XtaskCmd::PublishReleaseNotes(cmd) => cmd.run(sh),
         flags::XtaskCmd::Metrics(cmd) => cmd.run(sh),
         flags::XtaskCmd::Bb(cmd) => {
             {
diff --git a/xtask/src/publish.rs b/xtask/src/publish.rs
new file mode 100644
index 0000000000..8045334207
--- /dev/null
+++ b/xtask/src/publish.rs
@@ -0,0 +1,80 @@
+mod notes;
+
+use crate::flags;
+use anyhow::{anyhow, bail, Result};
+use std::env;
+use xshell::{cmd, Shell};
+
+impl flags::PublishReleaseNotes {
+    pub(crate) fn run(self, sh: &Shell) -> Result<()> {
+        let asciidoc = sh.read_file(&self.changelog)?;
+        let markdown = notes::convert_asciidoc_to_markdown(std::io::Cursor::new(&asciidoc))?;
+        let tag_name = extract_tag_name(&self.changelog)?;
+        if self.dry_run {
+            println!("{}", markdown);
+        } else {
+            update_release(sh, &tag_name, &markdown)?;
+        }
+        Ok(())
+    }
+}
+
+fn extract_tag_name<P: AsRef<std::path::Path>>(path: P) -> Result<String> {
+    let file_name = path
+        .as_ref()
+        .file_name()
+        .ok_or_else(|| anyhow!("file name is not specified as `changelog`"))?
+        .to_string_lossy();
+
+    let mut chars = file_name.chars();
+    if file_name.len() >= 10
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap() == '-'
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap() == '-'
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+    {
+        Ok(file_name[0..10].to_owned())
+    } else {
+        bail!("extraction of date from the file name failed")
+    }
+}
+
+fn update_release(sh: &Shell, tag_name: &str, release_notes: &str) -> Result<()> {
+    let token = match env::var("GITHUB_TOKEN") {
+        Ok(token) => token,
+        Err(_) => bail!("Please obtain a personal access token from https://github.com/settings/tokens and set the `GITHUB_TOKEN` environment variable."),
+    };
+    let accept = "Accept: application/vnd.github+json";
+    let authorization = format!("Authorization: Bearer {}", token);
+    let api_version = "X-GitHub-Api-Version: 2022-11-28";
+    let release_url = "https://api.github.com/repos/rust-lang/rust-analyzer/releases";
+
+    let release_json = cmd!(
+        sh,
+        "curl -s -H {accept} -H {authorization} -H {api_version} {release_url}/tags/{tag_name}"
+    )
+    .read()?;
+    let release_id = cmd!(sh, "jq .id").stdin(release_json).read()?;
+
+    let mut patch = String::new();
+    write_json::object(&mut patch)
+        .string("tag_name", &tag_name)
+        .string("target_commitish", "master")
+        .string("name", &tag_name)
+        .string("body", &release_notes)
+        .bool("draft", false)
+        .bool("prerelease", false);
+    let _ = cmd!(
+        sh,
+        "curl -s -X PATCH -H {accept} -H {authorization} -H {api_version} {release_url}/{release_id} -d {patch}"
+    )
+    .read()?;
+
+    Ok(())
+}