├── helloworld ├── README.md ├── java_launcher └── LICENSE /helloworld: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env java_launcher 2 | # vim:ft=java 3 | 4 | public class helloworld { 5 | public static void main(String[] args) { 6 | System.out.println("Hello world!"); 7 | } 8 | } 9 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Java launcher 2 | 3 | Helper script to treat Java programs as scripts. 4 | 5 | ## Overview 6 | 7 | Put the `java_launcher` script in your path and put the following line at the 8 | top of an executable Java source program: 9 | 10 | #!/usr/bin/env java_launcher 11 | 12 | If you use Vim, add the following line: 13 | 14 | # vim:ft=java 15 | 16 | Optionally add jars to compile and run with: 17 | 18 | # lib:/home/lk/kiln/teamten/java/dist/teamten.jar 19 | 20 | Relative pathnames are relative to your Java script. In addition, all jars 21 | in a `java_lib` directory below the `java_launcher` script will be included. 22 | 23 | The source will be compiled, cached, and executed. The source file does not 24 | need a `.java` extension, but it does need to match the name of the class. 25 | 26 | ## Example 27 | 28 | Put this into a file called `helloworld` and make the file executable. The name 29 | of the file must match the name of the class. 30 | 31 | #!/usr/bin/env java_launcher 32 | # vim:ft=java 33 | 34 | public class helloworld { 35 | public static void main(String[] args) { 36 | System.out.println("Hello world!"); 37 | } 38 | } 39 | 40 | Then run: 41 | 42 | % ./helloworld 43 | Hello world! 44 | 45 | -------------------------------------------------------------------------------- /java_launcher: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | # Copyright 2014 Lawrence Kesteloot 4 | # 5 | # Licensed under the Apache License, Version 2.0 (the "License"); 6 | # you may not use this file except in compliance with the License. 7 | # You may obtain a copy of the License at 8 | # 9 | # http://www.apache.org/licenses/LICENSE-2.0 10 | # 11 | # Unless required by applicable law or agreed to in writing, software 12 | # distributed under the License is distributed on an "AS IS" BASIS, 13 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 | # See the License for the specific language governing permissions and 15 | # limitations under the License. 16 | 17 | # Put this script in your path and write the following line at the top of an 18 | # executable Java source program: 19 | # 20 | # #!/usr/bin/env java_launcher 21 | # 22 | # Additional documentation here: https://github.com/lkesteloot/java_launcher 23 | 24 | # Quit on error. 25 | set -e 26 | 27 | # Get the name of the script, which the shell passes to us automatically. 28 | SOURCE_PATHNAME=$1 29 | if [ "$SOURCE_PATHNAME" = "" ]; then 30 | echo "java_launcher: Must supply name of script as first argument." 31 | exit 1 32 | fi 33 | 34 | # Skip the script name. 35 | shift 36 | 37 | # Compute the MD5 of both the source file and this script. 38 | if [ -f /sbin/md5 ]; then 39 | # Mac OS/X. 40 | SUM=$(cat "$SOURCE_PATHNAME" $0 | md5) 41 | else 42 | # Linux. 43 | SUM=$(cat "$SOURCE_PATHNAME" $0 | md5sum | cut -d' ' -f1) 44 | fi 45 | SOURCE_FILENAME=$(basename "$SOURCE_PATHNAME") 46 | SOURCE_DIR=$(dirname "$SOURCE_PATHNAME") 47 | CLASS_NAME=$(echo $SOURCE_FILENAME | sed -e 's/\.*//') 48 | CACHE_DIR=$HOME/.java_launcher_cache 49 | CLASS_DIR=$CACHE_DIR/$SUM 50 | PROCESSED_SOURCE=$CLASS_DIR/${SOURCE_FILENAME}.java 51 | PROCESSED_CLASS=$CLASS_DIR/${SOURCE_FILENAME}.class 52 | 53 | # Process source to find libs for classpath. Relative jars are made relative to the 54 | # source file. 55 | export CLASSPATH=$(awk 'BEGIN { CLASSPATH="" } /^# lib:(.*)$/ { jar = substr($0, 7); if (substr(jar, 1, 1) != "/") jar = SOURCE_DIR "/" jar; if (CLASSPATH != "") CLASSPATH = CLASSPATH ":"; CLASSPATH = CLASSPATH jar } END { print CLASSPATH }' SOURCE_DIR="$SOURCE_DIR" < "$SOURCE_PATHNAME") 56 | 57 | # Default libraries. Put default ones last. 58 | SCRIPT_DIR=$(dirname $0) 59 | LIB_DIR=$SCRIPT_DIR/java_lib 60 | export CLASSPATH=$CLASSPATH:$LIB_DIR/\* 61 | 62 | # Compile if necessary. 63 | if [ -f "$PROCESSED_CLASS" ]; then 64 | # Refresh the dir so that we know we've used it recently. 65 | touch "$CLASS_DIR" 66 | else 67 | mkdir -p "$CLASS_DIR" 68 | 69 | # Remove header. That's anything that starts with #. Replace the lines with 70 | # an empty line so the line numbers don't get thrown off. 71 | sed -e 's/^#.*//' < "$SOURCE_PATHNAME" > "$PROCESSED_SOURCE" 72 | 73 | # Compile real source to our cache. 74 | javac -d "$CLASS_DIR" "$PROCESSED_SOURCE" 75 | fi 76 | 77 | # Run the program, passing on arguments from command line. 78 | export CLASSPATH=$CLASS_DIR:$CLASSPATH 79 | java -Xmx1024m $CLASS_NAME $* 80 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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