Local "Rust Playground" script

rpl.sh

#!/bin/sh
# Local "Rust Playground"
# Bart Massey 2021
# Requires `cargo-add` and this additional shell function:
# function rpl {                                                                  
#          DIR="`$HOME/bin/mi/rpl \"$@\"`" &&                                     
#          echo "dir '$DIR'" >&2 &&                                               
#          pushd $DIR &&                                                          
#          if [ -f src/main.rs ]                                                  
#          then                                                                   
#              emacs -nw +2 src/main.rs                                           
#          elif [ -f src/lib.rs ]                                                 
#          then                                                                   
#              emacs -nw src/lib.rs                                               
#          else                                                                   
#              emacs -nw *.rs                                                     
#          fi                                                                     
# }                                                                               

USAGE="usage: rpl <--bin|--lib> <crate-name> [<dep-crate> ...]"
if [ $# -eq 0 ]
then
    echo "$USAGE" >&2
    exit 1
fi
CRATE_TYPE=""
MINI=true
while [ $# -gt 1 ]
do
    case "$1" in
        "--lib"|"--bin") CRATE_TYPE="$1"; shift ;;
        "--mini") MINI=true; shift ;;
        "--std") MINI=false; shift ;;
        "-*") echo "$USAGE" >&2; exit 1;;
        *) break ;;
    esac
done
if [ "$CRATE_TYPE" = "" ]
then
    echo "must specify crate type" >&2
    exit 1
fi
CRATE_NAME="$1"; shift
CRATE_DIR="$HOME/.rpl/$CRATE_NAME"
if [ -s "$CRATE_DIR/Cargo.toml" ]
then
    echo "$CRATE_DIR"
    exit 0
fi
mkdir -p "$CRATE_DIR" &&
cd "$CRATE_DIR" &&
if $MINI
then
    # Was a workaround for https://github.com/rust-lang/cargo/issues/9333
    # but keeping it because convenience.
    case "$CRATE_TYPE" in
        "--lib") touch "$CRATE_NAME".rs ;;
        "--bin")
            cat >"$CRATE_NAME".rs <<'EOF'
fn main() {
    
}
EOF
            ;;
        *) echo "unknown crate type $CRATE_TYPE" >&2; exit 1 ;;
    esac
fi &&
cargo init -q --vcs=none "$CRATE_TYPE" &&
for DEP in "$@"
do
    cargo add -q "$DEP"
    if [ $? -ne 0 ]
    then
        exit 1
    fi
done &&
echo "$CRATE_DIR"