/*
* Copyright Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the authors tag. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*
* This particular file is subject to the "Classpath" exception as provided in the
* LICENSE file that accompanied this code.
*
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License,
* along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
package com.redhat.ceylon.tools.bashcompletion;
import java.io.File;
import java.io.FileFilter;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.TreeSet;
import com.redhat.ceylon.common.tool.Argument;
import com.redhat.ceylon.common.tool.Description;
import com.redhat.ceylon.common.tool.Hidden;
import com.redhat.ceylon.common.tool.OptionArgument;
import com.redhat.ceylon.common.tool.OptionModel;
import com.redhat.ceylon.common.tool.Summary;
import com.redhat.ceylon.common.tool.Tool;
import com.redhat.ceylon.common.tool.ToolLoader;
import com.redhat.ceylon.common.tool.ToolModel;
import com.redhat.ceylon.common.tool.OptionModel.ArgumentType;
import com.redhat.ceylon.common.tools.CeylonTool;
@Hidden
@Summary(
value="A tool which provides completion suggestions for the Bash shell.")
@Description("The `<arguments>` are the elements of the `${COMP_WORDS}` bash array variable.\n" +
"\n" +
"The tool inspects the `<arguments>` and writes its completions to standard output." +
"Currently the tool can complete\n" +
"\n" +
"* tool names (except tools names which are arguments to another tool),\n" +
"* long option names,\n" +
"* long option values **if** the setter type is a `java.lang.File` or a subclass" +
" of `java.lang.Enum`.")
public class CeylonBashCompletionTool implements Tool {
public static class CompletionResults {
private List<String> results = new ArrayList<String>();
private String prefix = "";
private String partial = "";
public void setPrefix(String prefix) {
this.prefix = prefix;
}
public void setPartial(String partial) {
this.partial = partial;
}
public boolean addResult(String completion) {
if (completion.startsWith(partial)) {
results.add(completion);
return true;
}
return false;
}
public void emitCompletions() {
boolean appendSpace = results.size() == 1;
for (String result : results) {
String completion;
if (prefix.isEmpty()) {
completion = escape(result);
} else {
completion = escape(prefix + result.substring(partial.length()));
}
if (appendSpace) {
// If there's only one result, append a space
completion = completion + " ";
}
System.out.println(completion);
}
System.out.flush();
}
private String escape(String completion) {
return completion.replace("\n", "\\\n");
}
}
private int cword = -1;
private List<String> arguments;
private ToolLoader toolLoader;
@OptionArgument
@Description("The index in the `<arguments>` of the argument being " +
"completed, i.e. The value of `${COMP_CWORD}`.")
public void setCword(int word) {
this.cword = word;
}
@Argument(argumentName="arguments", multiplicity="*")
public void setArguments(List<String> arguments) {
this.arguments = arguments;
}
public final void setToolLoader(ToolLoader toolLoader) {
this.toolLoader = toolLoader;
}
@Override
public void initialize() {
}
@Override
public void run() throws Exception {
arguments.remove(0);// we don't care about arg0
cword--;
final CompletionResults results;
if (cword == 0) {
// We're completing the name of the tool to run
results = completeToolNames(arguments.isEmpty() ? "" : arguments.get(cword));
} else if (cword < arguments.size()) {
String argument = arguments.get(cword);
CeylonTool main = new CeylonTool();
main.setArgs(arguments);
main.setToolLoader(toolLoader);
ToolModel<?> tool = main.getToolModel();
if (!afterEoo()) {
if (argument.startsWith("--")) {
if (argument.contains("=")) {
results = completeLongOptionArgument(tool, argument);
} else {
results = completeLongOption(tool, argument);
}
} else if (argument.startsWith("-")) {
/*TODO for (OptionModel<?> option : tool.getOptions()) {
if (argument.charAt(argument.length()-1) == option.getShortName()) {
complete
}
}*/
results = new CompletionResults();
} else {
// TODO it's argument completion unless the previous argument was a
// non-pure short option
results = new CompletionResults();
}
} else {
// TODO else it must be argument completion
results = new CompletionResults();
}
} else {
// TODO we don't know what we're completing.
// First assume it's an argument...
// ... but if the tool doesn't have any arguments (or all the
// arguments are already specified) then assume it's an option
results = new CompletionResults();
}
results.emitCompletions();
}
private CompletionResults completeLongOptionArgument(ToolModel<?> tool, final String argument) {
int index = argument.indexOf('=');
String optionName = argument.substring(2, argument.charAt(index-1) == '\\' ? index-1 : index);
String partialValue = argument.substring(index+1);
OptionModel<?> option = tool.getOption(optionName);
Class<?> type = option.getArgument().getType();
/*
* In general,
* 1. instantiate the tool, binding all arguments except
* the one being completed. do not invoke @PostConstruct
* 2. If the option's setter has @CompletedBy(method=methodname)
* call methodname(partial);
* 3. If the option's setter has @CompletedBy(Completer)
* then instantiate the given completer and
* call Completer.complete(tool, partial)
* 4. If the setter type is annotated with @CompletedBy
* then instantiate the given completer and
* call Completer.complete(tool, partial).
* 5. Revert to some build in completions.
*/
if (File.class.isAssignableFrom(type)) {
return completeFilename(argument, partialValue, true, null);
} else if (Enum.class.isAssignableFrom(type)) {
return completeEnum(argument, (Class<? extends Enum>)type, partialValue);
}
return new CompletionResults();
}
private <E extends Enum<E>> CompletionResults completeEnum(String argumentPrefix, Class<E> type, String partialValue) {
try {
CompletionResults result = new CompletionResults();
result.setPartial(partialValue);
result.setPrefix(argumentPrefix);
Method method = type.getMethod("values", (Class[])null);
E[] values = (E[])method.invoke(null);
for (E value : values) {
String enumElementName = value.toString();
result.addResult(enumElementName);
}
return result;
} catch (Exception e) {
throw new RuntimeException();
}
}
private CompletionResults completeFilename(String argumentPrefix, String partialValue, boolean wantFiles,
final FileFilter fileFilter) {
File file;
final String partial;
if (partialValue.isEmpty()) {
file = new File(".").getAbsoluteFile();
partial = "";
} else {
file = new File(partialValue).getAbsoluteFile();
partial = file.getName();
}
File[] files = file.getParentFile().listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
String name = pathname.getName();
if (pathname.isFile() && fileFilter != null) {
return name.startsWith(partial) && fileFilter.accept(pathname);
}
return name.startsWith(partial);
}
});
CompletionResults results = new CompletionResults();
results.setPrefix(argumentPrefix);
results.setPartial(partialValue);
if (files != null) {
for (File f : files) {
if (f.isDirectory() && wantFiles) {
results.addResult(f.getName()+"/");
} else {
results.addResult(f.getName());
}
}
}
return results;
}
private CompletionResults completeLongOption(ToolModel<?> tool, String argument) {
Comparator<OptionModel<?>> comparator = new Comparator<OptionModel<?>>() {
@Override
public int compare(OptionModel<?> o1, OptionModel<?> o2) {
return o1.getLongName().compareTo(o2.getLongName());
}
};
CompletionResults results = new CompletionResults();
results.setPartial(argument);
TreeSet<OptionModel<?>> sorted = new TreeSet<OptionModel<?>>(comparator);
sorted.addAll(tool.getOptions());
for (OptionModel<?> option : sorted) {
results.addResult("--" + option.getLongName() + (option.getArgumentType() == ArgumentType.NOT_ALLOWED ? "" : "\\="));
}
return results;
}
private boolean afterEoo() {
boolean eoo = false;
for (int ii = 0; ii < cword; ii++) {
if (arguments.get(ii).equals("--")) {
eoo = true;
break;
}
}
return eoo;
}
private CompletionResults completeToolNames(String partial) {
if(partial.indexOf(',') != -1){
// complete the last tool after the comma, even if it's empty
partial = partial.substring(partial.lastIndexOf(',')+1);
}
CompletionResults results = new CompletionResults();
results.setPartial(partial);
for (String toolName : toolLoader.getToolNames()) {
if (toolLoader.loadToolModel(toolName).isPorcelain()) {
results.addResult(toolName);
}
}
return results;
}
}