add support to java

- support, e.g. auto add lib import statements, auto fold the
  statements, auto comment the statements before submission, etc.

Author: 8ooo8

autoload/leetcode/lang/java.vim

@@ -1,25 +1,91 @@
 let s:lang = 'java'
 let s:ext = 'java'
+let s:dependencies = [
+      \'/*** [' .g:leetcode_name .'] For Local Syntax Checking ***/',
+      \'import java.util.*;',
+      \'import java.util.stream.*;',
+      \'import javafx.util.*;',
+      \'import java.util.Map.Entry;', '']
+let s:depend_location = '/\mclass\s\+solution\c\s\+{/-' 
+let s:code_begin_location = '?\m)\s*{?+'
+
+"" TODO: refactor to reuse the duplicated logic
 
 fu! leetcode#lang#java#locateLeetcodeCliComment(topmost_line)
+  exe 'keepj norm! ' .(a:topmost_line - 1) .'G'
+  let comment_first_line = search('\/\*')
+  let comment_last_line = searchpair('\/\*', '', '\*\/', 'W')
+  return [comment_first_line, comment_last_line]
 endfu
 
 fu! leetcode#lang#java#getCustomDependencies()
+  keepj norm! gg
+  let lc_code_start_line = search('@\s*lc\s*code\s*=\s*start')
+  let [comment_first_line, comment_last_line] = leetcode#lang#java#locateLeetcodeCliComment(lc_code_start_line + 1)
+  exe 'keepj norm! ' .comment_first_line .'G'
+  let definition_comment_line = search('\cdefinition for')
+  if definition_comment_line == 0
+    retu []
+  endif
+  let custom_depend = []
+  let custom_depend_line = definition_comment_line + 1
+  while custom_depend_line < comment_last_line
+    exe 'keepj norm! ' .custom_depend_line .'G'
+    cal add(custom_depend, getline(custom_depend_line))
+    let custom_depend_line += 1
+  endwhile
+  cal map(custom_depend, {key, val -> matchstr(val, '\s*\*\+\s*\zs.*')})
+  retu custom_depend
 endfu
 
 fu! leetcode#lang#java#addDependencies()
+  keepj norm! gg   
+  try | exe 'keepp sil ' .s:depend_location
+  cat /E486/ 
+    throw 'Error in locating the position to add dependencies'
+  endt
+  "" Add dependencies and make it non-undoable
+  let old_ul = &ul
+  setl ul=-1
+  keepj cal append(line('.'), s:dependencies)
+  let custom_depend = leetcode#lang#java#getCustomDependencies()
+  let custom_depend_begin_line = search(s:dependencies[len(s:dependencies) - 3])
+  keepj cal append(custom_depend_begin_line, custom_depend)
+  exe 'setlocal ul='.old_ul
+  retu 1
 endfu
 
 fu! leetcode#lang#java#foldDependencies()
+  setl foldmethod=manual
+  try 
+    keepj norm! gg
+    let first_fold_line = search(escape(s:dependencies[0], '/*[]'))
+    if foldclosed(first_fold_line) == -1
+      exe 'keepj keepp sil /\m\C\s*\/\{-,2}\s*' .escape(s:dependencies[1], '.*') .'\s*$'
+      let last_fold_line = search(escape(s:dependencies[-2], '.*'))
+      exe 'keepj norm! ' .first_fold_line .'G' .(last_fold_line - first_fold_line + 1) .'zF'
+    en
+    retu 1
+  cat /E486/
+    throw 'Error in locating the dependencies to fold'
+  endt
 endfu
 
 fu! leetcode#lang#java#goToWhereCodeBegins()
+  keepj keepp sil /\m\%$/
+  try 
+    exe 'sil ' .s:code_begin_location
+  cat /E486/
+    throw 'Error in locating where to start code writing.'
+  endt
 endfu
 
 fu! leetcode#lang#java#commentDependencies()
+  exe 'keepj keepp sil %sm@\C^\(.*' .s:dependencies[1] .'.*\)$@//\1@'
 endfu
 
 fu! leetcode#lang#java#uncommentDependencies()
+  exe 'keepj keepp sil %sm@\C\s*\zs/*\ze.*' .s:dependencies[1] .'.*$@@'
 endfu
 
 fu! leetcode#lang#java#getExt()

plugin/leetcode.vim

@@ -1,4 +1,4 @@
-"" Version: 0.5.0
+"" Version: 0.6.0
 "" Description:
 "" This is a leetcode question and code file manager. It allows a quick 
 "" download, load, test and submission of leetcode questions. The file