Add logger

.gitignore

@@ -8,3 +8,4 @@ doc/tags
 *-rplugin~
 *rplugin.vim
 /config/local.vim
+.SpaceVim.log

autoload/SpaceVim.vim

@@ -84,6 +84,13 @@ let g:spacevim_plugin_manager          = 'dein'  " neobundle or dein or vim-plug
 "   let g:spacevim_checkinstall = 0
 " <
 let g:spacevim_checkinstall            = 1
+""
+" Enable/Disable debug mode for SpaceVim, by default it is disabled.
+"
+" to enable it: >
+"   let g:spacevim_enable_debug = 1
+" <
+let g:spacevim_enable_debug            = 0
 let g:spacevim_hiddenfileinfo          = 1
 let g:spacevim_plugin_groups_exclude   = []
 ""

autoload/SpaceVim/logger.vim

@@ -0,0 +1,53 @@
+let s:logger_level = 0
+let s:levels = ['Info', 'Warn', 'Error']
+let s:logger_file = expand('~/.SpaceVim/.SpaceVim.log')
+""
+" @public
+" Set debug level of SpaceVim, by default it is 0.
+"
+"     0 : log all the message.
+"
+"     1 : log warning and error message
+"
+"     2 : log error message only
+function! SpaceVim#logger#setLevel(level) abort
+    let s:logger_level = a:level
+endfunction
+
+function! s:wite(msg) abort
+    call writefile([a:msg], s:logger_file, 'a')
+endfunction
+
+function! SpaceVim#logger#info(msg) abort
+    call s:wite(s:warpMsg(a:msg, 1))
+endfunction
+
+function! SpaceVim#logger#viewLog(...) abort
+    let l = a:0 > 0 ? a:1 : 0
+    let logs = readfile(s:logger_file, '')
+    for log in logs
+        if log =~# '\[ SpaceVim \] \[\d\d\:\d\d\:\d\d\] \[' . s:levels[l] .'\]'
+            echo log
+        endif
+    endfor
+endfunction
+
+""
+" @public
+" Set log output file of SpaceVim. by default it is
+" `~/.SpaceVim/.SpaceVim.log`
+function! SpaceVim#logger#setOutput(file) abort
+    let s:logger_file = a:file
+endfunction
+
+function! s:warpMsg(msg,l) abort
+    let time = strftime('%H:%M:%S')
+    let log = '[ SpaceVim ] [' . time . '] [' . s:levels[a:l - 1] . '] ' . a:msg
+    return log
+endfunction
+
+function! SpaceVim#logger#echoWarn(msg) abort
+    echohl WarningMsg
+    echom s:warpMsg(a:msg, 1)
+    echohl None
+endfunction

doc/SpaceVim.txt

@@ -82,6 +82,14 @@ To disable it:
   let g:spacevim_checkinstall = 0
 <
 
+                                                     *g:spacevim_enable_debug*
+Enable/Disable debug mode for SpaceVim, by default it is disabled.
+
+to enable it:
+>
+  let g:spacevim_enable_debug = 1
+<
+
                                                     *g:spacevim_plugin_groups*
 groups of plugins should be loaded.
 
@@ -119,5 +127,18 @@ SpaceVim#Layer({layer})                                     *SpaceVim#Layer()*
   Load the {layer} you want : autocompletion : Make SpaceVim support
   autocompletion. unite : Unite centric work-flow
 
+SpaceVim#logger#setLevel({level})                 *SpaceVim#logger#setLevel()*
+  Set debug level of SpaceVim, by default it is 0.
+
+      0 : log all the message.
+
+      1 : log warning and error message
+
+      2 : log error message only
+
+SpaceVim#logger#setOutput({file})                *SpaceVim#logger#setOutput()*
+  Set log output file of SpaceVim. by default it is
+  `~/.SpaceVim/.SpaceVim.log`
+
 
 vim:tw=78:ts=8:ft=help:norl: