#!/bin/sh
# Download and install rust analyzer to ~/.local/bin

set -ex

## Set this to get a fixed version
# PIN_VERSION="2022-05-02"

if [ -n "$PIN_VERSION" ]
then
    REPO="https://github.com/rust-analyzer/rust-analyzer"
    VERSION="$PIN_VERSION"
    DLURL="$REPO/releases/download/$VERSION/rust-analyzer-x86_64-unknown-linux-gnu.gz"
else
    API_URL="https://api.github.com/repos/rust-lang/rust-analyzer/releases/latest"
    API_RESP="$(curl "$API_URL")"
    VERSION=$(echo "$API_RESP" | jq -r '.tag_name')
    DLURL=$(echo "$API_RESP" | jq -r '.assets[]|select(.name|match("x86_64.*gnu")).browser_download_url')
fi

GZFILE="$HOME/.cache/rust-analyzer-$VERSION-x86_64-unknown-linux-gnu.gz"
BINDIR="$HOME/.local/bin"

test -f "$GZFILE" ||
    wget -O "$GZFILE" "$DLURL"

rm -f "$BINDIR/rust-analyzer"
gunzip "$GZFILE" --stdout > "$BINDIR/rust-analyzer"
chmod u+x "$BINDIR/rust-analyzer"