public static boolean completeFilePath()

in core/src/main/java/com/taobao/arthas/core/shell/cli/CompletionUtils.java [89:161]
61 lines of code
17 McCabe index (conditional complexity)

    public static boolean completeFilePath(Completion completion) {
        List<CliToken> tokens = completion.lineTokens();
        String token = tokens.get(tokens.size() - 1).value();

        if (token.startsWith("-") || StringUtils.isBlank(token)) {
            return false;
        }

        File dir = null;
        String partName = "";
        if (StringUtils.isBlank(token)) {
            dir = new File("").getAbsoluteFile();
            token = "";
        } else if (isEndOfDirectory(token)) {
            dir = new File(token);
        } else {
            File parent = new File(token).getAbsoluteFile().getParentFile();
            if (parent != null && parent.exists()) {
                dir = parent;
                partName = new File(token).getName();
            }
        }

        File tokenFile = new File(token);

        String tokenFileName = null;
        if (isEndOfDirectory(token)) {
            tokenFileName = "";
        } else {
            tokenFileName = tokenFile.getName();
        }

        if (dir == null) {
            return false;
        }

        File[] listFiles = dir.listFiles();

        ArrayList<String> names = new ArrayList<>();
        if (listFiles != null) {
            for (File child : listFiles) {
                if (child.getName().startsWith(partName)) {
                    if (child.isDirectory()) {
                        names.add(child.getName() + "/");
                    } else {
                        names.add(child.getName());
                    }
                }
            }
        }

        if (names.size() == 1 && isEndOfDirectory(names.get(0))) {
            String name = names.get(0);
            // 这个函数补全后不会有空格，并且只能传入要补全的内容
            completion.complete(name.substring(tokenFileName.length()), false);
            return true;
        }

        String prefix = null;
        if (isEndOfDirectory(token)) {
            prefix = token;
        } else {
            prefix = token.substring(0, token.length() - new File(token).getName().length());
        }

        ArrayList<String> namesWithPrefix = new ArrayList<>();
        for (String name : names) {
            namesWithPrefix.add(prefix + name);
        }
        // 这个函数需要保留前缀
        CompletionUtils.complete(completion, namesWithPrefix);
        return true;
    }