From 271959ee271229e21594c7ddb2d2f52165ad8955 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 25 Jul 2024 21:29:37 +0000
Subject: [PATCH] add debug list-dependencies admin command

Signed-off-by: Jason Volk <jason@zemos.net>
---
 src/admin/debug/commands.rs | 24 ++++++++++++++++++++++++
 src/admin/debug/mod.rs      |  6 ++++++
 src/core/info/cargo.rs      | 24 +++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/src/admin/debug/commands.rs b/src/admin/debug/commands.rs
index 32fba409..307495d7 100644
--- a/src/admin/debug/commands.rs
+++ b/src/admin/debug/commands.rs
@@ -745,3 +745,27 @@ pub(super) async fn time(_body: &[&str]) -> Result<RoomMessageEventContent> {
 	let now = SystemTime::now();
 	Ok(RoomMessageEventContent::text_markdown(utils::time::format(now, "%+")))
 }
+
+pub(super) async fn list_dependencies(_body: &[&str], names: bool) -> Result<RoomMessageEventContent> {
+	if names {
+		let out = info::cargo::dependencies_names().join(" ");
+		return Ok(RoomMessageEventContent::notice_markdown(out));
+	}
+
+	let deps = info::cargo::dependencies();
+	let mut out = String::new();
+	writeln!(out, "| name | version | features |")?;
+	writeln!(out, "| ---- | ------- | -------- |")?;
+	for (name, dep) in deps {
+		let version = dep.try_req().unwrap_or("*");
+		let feats = dep.req_features();
+		let feats = if !feats.is_empty() {
+			feats.join(" ")
+		} else {
+			String::new()
+		};
+		writeln!(out, "{name} | {version} | {feats}")?;
+	}
+
+	Ok(RoomMessageEventContent::notice_markdown(out))
+}
diff --git a/src/admin/debug/mod.rs b/src/admin/debug/mod.rs
index 77bc36b8..babd6047 100644
--- a/src/admin/debug/mod.rs
+++ b/src/admin/debug/mod.rs
@@ -178,6 +178,12 @@ pub(super) enum DebugCommand {
 	/// - Print the current time
 	Time,
 
+	/// - List dependencies
+	ListDependencies {
+		#[arg(short, long)]
+		names: bool,
+	},
+
 	/// - Developer test stubs
 	#[command(subcommand)]
 	#[allow(non_snake_case)]
diff --git a/src/core/info/cargo.rs b/src/core/info/cargo.rs
index 0d2db1ad..544bbb8f 100644
--- a/src/core/info/cargo.rs
+++ b/src/core/info/cargo.rs
@@ -5,7 +5,7 @@
 
 use std::sync::OnceLock;
 
-use cargo_toml::Manifest;
+use cargo_toml::{DepsSet, Manifest};
 use conduit_macros::cargo_manifest;
 
 use crate::Result;
@@ -36,6 +36,18 @@ const MAIN_MANIFEST: &'static str = ();
 /// For *enabled* features see the info::rustc module instead.
 static FEATURES: OnceLock<Vec<String>> = OnceLock::new();
 
+/// Processed list of dependencies. This is generated from the datas captured in
+/// the MANIFEST.
+static DEPENDENCIES: OnceLock<DepsSet> = OnceLock::new();
+
+#[must_use]
+pub fn dependencies_names() -> Vec<&'static str> { dependencies().keys().map(String::as_str).collect() }
+
+pub fn dependencies() -> &'static DepsSet {
+	DEPENDENCIES
+		.get_or_init(|| init_dependencies().unwrap_or_else(|e| panic!("Failed to initialize dependencies: {e}")))
+}
+
 /// List of all possible features for the project. For *enabled* features in
 /// this build see the companion function in info::rustc.
 pub fn features() -> &'static Vec<String> {
@@ -64,3 +76,13 @@ fn append_features(features: &mut Vec<String>, manifest: &str) -> Result<()> {
 
 	Ok(())
 }
+
+fn init_dependencies() -> Result<DepsSet> {
+	let manifest = Manifest::from_str(WORKSPACE_MANIFEST)?;
+	Ok(manifest
+		.workspace
+		.as_ref()
+		.expect("manifest has workspace section")
+		.dependencies
+		.clone())
+}