rustlings/install.sh

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#!/usr/bin/env bash
echo "Let's get you set up with Rustlings!"
echo "Checking requirements..."
if [ -x "$(command -v git)" ]
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then
echo "SUCCESS: Git is installed"
else
echo "ERROR: Git does not seem to be installed."
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echo "Please download Git using your package manager or over https://git-scm.com/!"
exit 1
fi
if [ -x "$(command -v rustc)" ]
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then
echo "SUCCESS: Rust is installed"
else
echo "ERROR: Rust does not seem to be installed."
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echo "Please download Rust using https://rustup.rs!"
exit 1
fi
if [ -x "$(command -v cargo)" ]
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then
echo "SUCCESS: Cargo is installed"
else
echo "ERROR: Cargo does not seem to be installed."
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echo "Please download Rust and Cargo using https://rustup.rs!"
exit 1
fi
# Function that compares two versions strings v1 and v2 given in arguments (e.g 1.31 and 1.33.0).
# Returns 1 if v1 > v2, 0 if v1 == v2, 2 if v1 < v2.
function vercomp() {
if [[ $1 == $2 ]]
then
return 0
fi
v1=( ${1//./ } )
v2=( ${2//./ } )
len1=${#v1[@]}
len2=${#v2[@]}
max_len=$len1
if [[ $max_len -lt $len2 ]]
then
max_len=$len2
fi
for i in `seq 0 $max_len`
do
# Fill empty fields with zeros in v1
if [ -z "${v1[$i]}" ]
then
v1[$i]=0
fi
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# And in v2
if [ -z "${v2[$i]}" ]
then
v2[$i]=0
fi
if [ ${v1[$i]} -gt ${v2[$i]} ]
then
return 1
fi
if [ ${v1[$i]} -lt ${v2[$i]} ]
then
return 2
fi
done
return 0
}
RustVersion=$(rustc --version | cut -d " " -f 2)
MinRustVersion=1.31
vercomp $RustVersion $MinRustVersion
if [ $? -eq 2 ]
then
echo "ERROR: Rust version is too old: $RustVersion - needs at least $MinRustVersion"
echo "Please update Rust with 'rustup update'"
exit 1
else
echo "SUCCESS: Rust is up to date"
fi
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Path=${1:-rustlings/}
echo "Cloning Rustlings at $Path..."
git clone -q https://github.com/rust-lang/rustlings $Path
Version=$(curl -s https://api.github.com/repos/rust-lang/rustlings/releases/latest | python -c "import json,sys;obj=json.load(sys.stdin);print(obj['tag_name']);")
echo "Checking out version $Version..."
cd $Path
git checkout -q tags/$Version
echo "Installing the 'rustlings' executable..."
cargo install --force --path .
if ! [ -x "$(command -v rustlings)" ]
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then
echo "WARNING: Please check that you have '~/.cargo/bin' in your PATH environment variable!"
fi
echo "All done! Run 'rustlings' to get started."