Helper to create and build projects with https://github.com/yewstack/yew as an alternative to wasm-pack

wasm.sh

#!/usr/bin/bash
# uses bash specific features

# Formatted with 'shfmt -i 4 -w file.sh'

# set -e
# set -u
set -o pipefail
shopt -s lastpipe

cargo_bin=$(realpath ${CARGO_INSTALL_ROOT:-${CARGO_HOME:-~/.cargo}/bin})
export PATH="$PATH:$cargo_bin"

function fail() {
    echo $@ >&2
    exit 1
}

function cargo_install_fail() {
    echo "" >&2
    echo "Unable to access '$1'!" >&2
    echo "Please ensure $cargo_bin is where cargo installs executables" >&2
    echo "Or otherwise add '$1' to PATH" >&2

    exit 1
}

function ensure_deps_installed() {
    cargo add --version >/dev/null 2>&1 || cargo_install_fail "cargo add"
    wasm-bindgen --version >/dev/null 2>&1 || cargo_install_fail "wasm-bindgen"
}

# Install dependencies for Arch Linux and rustup
function install() {
    sudo pacman -Syu --needed binaryen npm jq rustup
    rustup toolchain add stable
    rustup target add wasm32-unknown-unknown
    rustup update
    cargo install wasm-bindgen-cli cargo-edit
}

#src         rust source
#static      html/js/css source

#-- ignored --
#target      compiled rust
#dist        compiled html/js/css wasm

function new() {
    ensure_deps_installed

    cargo new -- "$1"

    mkdir --parents "$1"
    cd "$1"

    # to generate:
    # tar -czv .cargo/config .gitignore src/lib.rs static/index.html | base64
    base64 -d <<EOF | tar xz
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EOF

    # Last major release as of 06/15/2020
    cargo add --sort [email protected] [email protected] [email protected] [email protected]

    cat >>Cargo.toml <<EOF

[profile.release]
panic = 'abort'
codegen-units = 1
opt-level = 'z'
lto = true

EOF

    # package name != "$1" because "$1" could have subdirectories
    pkg_name=$(grep Cargo.toml -e "^name" | cut -d'"' -f2 | head --lines 1)

    cat >src/main.rs <<EOF
fn main() {
    yew::start_app::<$pkg_name::Model>();
}
EOF

    git add .
    git commit -m"Initial commit"
}

# Usage: `find_up filename`
# Recursively looks in current and parent directories
# until it finds the file.
# If found, echo the directory and exit 0.
# If not found, exit 1.

function find_up() {
    dir=$(pwd)
    while [[ $dir != / ]]; do
        find "$dir" -maxdepth 1 -mindepth 1 -name "$1" | read

        if [ $? -eq 0 ]; then
            echo $dir
            return 0
        fi

        dir="$(realpath -s "$dir"/..)"
    done

    return 1
}

function copy() {
    cp --verbose "$1" "$2"
}

# Usage: `minify_whatever source dest`

function minify_html() {
    # todo: uhhhhhh
    copy $@
}

function minify_js() {
    (
        npx --version >/dev/null 2>&1 &&
            npx terser -c -m module=true,reserved=['init'] \
                -o "$2" -- "$1"
    ) || copy $@
}

function minify_wasm() {
    (
        wasm-opt --version >/dev/null 2>&1 &&
            wasm-opt "$1" -Oz --strip-debug --output "$2"
    ) || copy $@
}

function cargo_build_debug() {
    # run once to get good user output, then run again to get json output
    cargo build --target wasm32-unknown-unknown $@ >&2 &&
        cargo build --target wasm32-unknown-unknown --message-format json $@ 2>/dev/null
}

function cargo_build_release() {
    cargo_build_debug --release $@
}

# Usage: `wasm-bindgen_mode compiled.wasm temp_dir [extras...]`
function wasm_bindgen_release() {
    source=$1
    dest=$2
    shift 2

    mkdir --parents "$dest"
    wasm-bindgen $@ --target web --no-typescript --out-dir "$dest" --out-name wasm "$source"
}

function wasm_bindgen_debug() {
    wasm_bindgen_release $@ --keep-debug --debug
}

function parse_location() {
    # TARGET="$SRCDIR/target/wasm32-unknown-unknown/{profile}/{name}.wasm"
    # jq --raw-output 'select(.target?.kind?[0] == "bin") | .target.name' | tail --lines 1

    # todo: catch {"reason":"build-finished","success":false} ?
    jq --raw-output 'select(.target?.kind?[0] == "bin") | .executable' | tail --lines 1
}

function cd_srcdir() {
    srcdir=$(find_up Cargo.toml)

    if [ $? -ne 0 ]; then
        fail "Could not find source directory"
    fi

    cd "$srcdir"
}

# Usage: `build` for debug
#        `build 1` for release

function build() {
    ensure_deps_installed
    cd_srcdir

    # mode == 0 -> debug, else release
    [[ $1 -eq 0 ]]
    mode=$?

    (
        if ((mode == 0)); then
            cargo_build_debug
        else
            cargo_build_release
        fi
    ) | parse_location | read binary || fail "Cargo build failed"

    echo "Binary at $binary"

    wasm_bindgen_dir="$(dirname "$binary")/wasm_bindgen_temp/"

    mkdir --parents dist

    # todo: copy arbitrary static/ files with correct minifiers

    if ((mode == 0)); then
        wasm_bindgen_debug "$binary" ./dist
        copy ./static/index.html ./dist/index.html
    else
        wasm_bindgen_release "$binary" "$wasm_bindgen_dir"
        minify_html ./static/index.html ./dist/index.html
        minify_js "$wasm_bindgen_dir/wasm.js" ./dist/wasm.js
        minify_wasm "$wasm_bindgen_dir/wasm_bg.wasm" ./dist/wasm_bg.wasm
    fi
}

function clean() {
    cd_srcdir

    rm -fdrv dist
}

function usage() {
    echo "Usage: $programname build|run [-r|--release]"
    echo "       $programname clean"
    echo "       $programname new <path>"
    echo "       $programname install  # Arch-only"
    return 1
}

function build_cmd() {
    release=0
    case $1 in
    "r" | "-r" | "--release")
        release=1
        ;;
    "") ;;

    *)
        usage
        return
        ;;
    esac
    build $release
}

function run() {
    build_cmd $@ &&

        # todo: port?
        python -m http.server --directory ./dist
}

function main() {
    programname=$(basename "$0")
    subcommand=$1
    shift

    case $subcommand in
    "b" | "build")
        build_cmd $@
        ;;
    "r" | "run")
        run $@
        ;;
    "n" | "new")
        new $@
        ;;
    "install")
        install
        ;;
    "c" | "clean")
        clean
        ;;
    "" | "help" | "-h" | "--help")
        usage
        ;;
    *)
        echo "Unknown command '$subcommand'"
        usage
        ;;
    esac
}

main $@