feat: add installer script

README.md

@@ -83,6 +83,14 @@ $ nix profile install 'github:ryanccn/nrr#nrr'
 
 nrr is also available in [Nixpkgs](https://github.com/NixOS/nixpkgs) as `nixpkgs#nrr`.
 
+### Installer
+
+This installer script works on Linux and macOS and downloads binaries from GitHub Releases, falling back to `cargo install` if a prebuilt binary cannot be found.
+
+```console
+$ curl --proto '=https' --tlsv1.2 -fsSL https://nrr.ryanccn.dev | sh
+```
+
 ### Cargo
 
 nrr supports [cargo-binstall](https://github.com/cargo-bins/cargo-binstall), which downloads a binary if possible from GitHub Releases instead of compiling the crate from source.

install.sh

@@ -0,0 +1,79 @@
+#!/bin/sh
+set -euf
+
+ansi_red="\033[31m"
+ansi_green="\033[32m"
+ansi_blue="\033[34m"
+ansi_yellow="\033[33m"
+ansi_bold="\033[1m"
+ansi_reset="\033[0m"
+
+success() {
+    printf "${ansi_green}success${ansi_reset}  %s\n" "$*"
+}
+
+info() {
+    printf "${ansi_blue}info${ansi_reset}     %s\n" "$*"
+}
+
+err() {
+    printf "${ansi_red}error${ansi_reset}    %s\n" "$*"
+}
+
+warn() {
+    printf "${ansi_yellow}warn${ansi_reset}     %s\n" "$*"
+}
+
+bold() {
+    printf "${ansi_bold}%s${ansi_reset}" "$*"
+}
+
+main() {
+    platform="$(uname -s)"
+    arch="$(uname -m)"
+
+    if [ "$platform" = "Darwin" ]; then
+        if [ "$arch" = "arm64" ]; then target="aarch64-apple-darwin";
+        elif [ "$arch" = "x86_64" ]; then target="x86_64-apple-darwin";
+        fi
+    elif [ "$platform" = "Linux" ]; then
+        if [ "$arch" = "arm64" ]; then target="aarch64-unknown-linux-musl";
+        elif [ "$arch" = "x86_64" ]; then target="x86_64-unknown-linux-musl";
+        fi
+    fi
+
+    if [ -z "$target" ]; then
+        if command -v cargo > /dev/null 2>&1; then
+            warn "GitHub Releases binary not found, falling back to cargo install"
+            cargo install nrr
+        else
+            err "Unsupported platform! Could not find binary to download from GitHub Releases"
+            exit 1
+        fi
+    fi
+
+    info "Downloading binary for target $(bold "$target")..."
+
+    asset_temp="$(mktemp)"
+    curl -fSL "https://github.com/ryanccn/nrr/releases/latest/download/nrr-$target.zip" > "$asset_temp"
+
+    unpack_temp="$(mktemp -d)"
+    unzip "$asset_temp" -d "$unpack_temp" > /dev/null 2>&1
+
+    cargo_home="${CARGO_HOME:-"$HOME/.cargo"}"
+    mkdir -p "$cargo_home/bin"
+
+    cp "$unpack_temp/nrr" "$cargo_home/bin"
+    chmod +x "$cargo_home/bin/nrr"
+
+    version="$(bold "$("$cargo_home/bin/nrr" --version)")"
+
+    success "Installed $version to $cargo_home/bin ^^"
+
+    case :$PATH:
+    in *:"$cargo_home/bin":*) ;;
+        *) warn "The installation directory is not in your PATH. You might want to add it in order to use nrr :p" >&2;;
+    esac
+}
+
+main || exit 1