commit 0a2a9a8637e06388b00b93aefecf4f8d3dcf3851
Author: aaron-jack-manning <contact@aaronmanning.net>
Date:   Thu Nov 2 10:52:36 2023 +1100

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2f7896d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+target/
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5c8c905
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,325 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..36d6162
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "typst-install"
+version = "0.1.0"
+edition = "2021"
+authors = ["Aaron Manning"]
+
+[dependencies]
+clap = { version = "4.4.7", features = ["derive"] }
+serde = { version = "1.0.190", features = ["derive"] }
+toml = "0.8.6"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8b4c126
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Typst Install
+
+A very simple program to install [typst](https://github.com/typst/typst) packages locally.
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c37faec
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,134 @@
+use std::io;
+use std::fs;
+use std::env;
+use std::path;
+use std::process;
+use std::borrow::Cow;
+
+#[derive(clap::Parser)]
+struct Args {
+    manifest : path::PathBuf,
+    #[clap(default_value = "local")]
+    namespace : String,
+}
+
+#[derive(serde::Deserialize)]
+struct Manifest<'a> {
+    package : Package<'a>,
+}
+
+#[derive(serde::Deserialize)]
+#[allow(dead_code)]
+struct Package<'a> {
+    /// The package's identifier in its namespace.
+    name : Cow<'a, str>,
+    /// The package's version as a full major-minor-patch triple. Package versioning should follow SemVer.
+    version : Cow<'a, str>,
+    /// The path to the main Typst file that is evaluated when the package is imported.
+    entrypoint : Cow<'a, path::Path>,
+}
+
+fn main() {
+
+    let args : Args = clap::Parser::parse();
+
+    let manifest = match fs::read_to_string(&args.manifest) {
+        Ok(file) => file,
+        Err(err) => {
+            eprintln!("Failed to read in manifest file: {}", err);
+            process::exit(1)
+        }
+    };
+
+    let manifest : Manifest<'_> = match toml::from_str(&manifest[..]) {
+        Ok(file) => file,
+        Err(err) => {
+            eprintln!("{}", err);
+            process::exit(1)
+        }
+    };
+    
+    // TODO move version number parsing into the deserialization itself
+    if let None = read_version(&manifest.package.version[..]) {
+        eprintln!("Invalid version number");
+        process::exit(1)
+    }
+
+    // See https://github.com/typst/packages#local-packages for package locations
+    let data = match env::consts::OS {
+        "linux" => {
+            env::var("XDG_DATA_HOME").unwrap_or("~/.local/share".to_owned())
+        },
+        "macos" => {
+            "~/Library/Application Support".to_owned()
+        },
+        "windows" => {
+            env::var("APPDATA").unwrap()
+        },
+        os => {
+            eprintln!("{} is not a supported operating system", os);
+            process::exit(1)
+        }
+    };
+
+    let entrypoint =
+        args.manifest.parent().unwrap().join(manifest.package.entrypoint);
+
+    if !entrypoint.exists() {
+        eprintln!("Entrypoint file {:?} does not exist", entrypoint);
+        process::exit(1)
+    }
+
+    let package_folder = path::PathBuf::from(data)
+        .join("typst/packages")
+        .join(args.namespace)
+        .join(manifest.package.name.into_owned())
+        .join(manifest.package.version.into_owned());
+
+    if package_folder.exists() {
+        loop {
+            print!("Package of the corresponding name and version already exists, would you like to continue, overwriting the existing package (y/n)? ");
+            use io::Write;
+            io::stdout().flush().unwrap();
+
+            let mut input = String::new();
+            match io::stdin().read_line(&mut input) {
+                Ok(_) => match &input.trim().to_lowercase()[..] {
+                    "y" => break,
+                    "n" => return,
+                    _ => continue,
+                },
+                Err(_) => continue,
+            }
+        }
+    }
+
+    if let Err(err) = copy_dir_all(args.manifest.parent().unwrap(), package_folder) {
+        eprintln!("Error occured while copying package folder to installation location: {}", err);
+        process::exit(1)
+    }
+}
+
+fn copy_dir_all(src: impl AsRef<path::Path>, dest: impl AsRef<path::Path>) -> io::Result<()> {
+    fs::create_dir_all(&dest)?;
+    for entry in fs::read_dir(src)? {
+        let entry = entry?;
+        if entry.file_type()?.is_dir() {
+            copy_dir_all(entry.path(), dest.as_ref().join(entry.file_name()))?;
+        } else {
+            fs::copy(entry.path(), dest.as_ref().join(entry.file_name()))?;
+        }
+    }
+    Ok(())
+}
+
+
+fn read_version(version : &str) -> Option<[u16; 3]> {
+    let version =
+        version.split(".")
+        .map(str::parse::<u16>)
+        .map(Result::ok)
+        .collect::<Option<Vec<u16>>>()?;
+
+    <[u16; 3]>::try_from(version).ok()
+}