Add lua logger api (#4395)

docs/api/logger.md

@@ -8,7 +8,8 @@ description: "logger API provides some basic functions for log message when crea
 <!-- vim-markdown-toc GFM -->
 
 - [Intro](#intro)
-- [functions](#functions)
+- [Functions](#functions)
+- [Usage](#usage)
 
 <!-- vim-markdown-toc -->
 
@@ -16,7 +17,19 @@ description: "logger API provides some basic functions for log message when crea
 
 `logger` API provides some functions to create logger for plugin.
 
-In vim script, loading the API before using it. You can also config the options of the API.
+
+## Functions
+
+| name            | description                    |
+| --------------- | ------------------------------ |
+| `set_name(str)` | set the name of current logger |
+
+
+## Usage
+
+The `logger` api provides two versions, the vim script and lua:
+
+**vim script:**
 
 here is an example for creatting logger for plugin `foo.vim`.
 
@@ -56,8 +69,18 @@ function! foo#log#setOutput(file) abort
 endfunction
 ```
 
-## functions
+**lua script:**
 
-| name            | description                    |
-| --------------- | ------------------------------ |
-| `set_name(str)` | set the name of current logger |
+```lua
+local logger = require('spacevim.api').import('logger')
+
+logger.set_name('foo')
+logger.set_level(1)
+logger.set_silent(1)
+logger.set_verbose(1)
+
+local function warn(msg)
+    logger.warn(msg)
+end
+
+```

lua/spacevim.lua

@@ -21,6 +21,16 @@ function M.eval(l)
     end
 end
 
+if vim.command ~= nil then
+    function M.cmd(command)
+        return vim.command(command)
+    end
+else
+    function M.cmd(command)
+        return vim.api.nvim_command(command)
+    end
+end
+
 -- there is no want to call viml function in old vim and neovim
 
 local function build_argv(...)

lua/spacevim/api/logger.lua

@@ -0,0 +1,98 @@
+local fn = nil
+if vim.fn == nil then
+    fn = require('spacevim').fn
+else
+    fn = vim.fn
+end
+
+local cmd = require('spacevim').cmd
+
+local M = {
+    ['name'] = '',
+    ['silent'] = 1,
+    ['level'] = 1,
+    ['verbose'] = 1,
+    ['file'] = '',
+    ['temp'] = {},
+}
+
+local levels = {'Info', 'Warn', 'Error'}
+
+function M.set_silent(sl)
+    M.silent = sl
+end
+
+function M.set_verbose(vb)
+    M.verbose = vb
+end
+
+function M.set_level(l)
+    M.level = l
+end
+
+function M.error(msg)
+    local time = fn.strftime('%H:%M:%S')
+    local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. levels[1] .. ' ] ' .. msg
+    if M.silent == 0 and M.verbose >= 1 then
+        cmd('echohl Error')
+        cmd('echom "' .. log .. '"')
+        cmd('echohl None')
+    end
+    M.write(log)
+end
+
+function M.write(msg)
+    table.insert(M.temp, msg)
+    if M.file ~= '' then
+        if fn.isdirectory(fn.fnamemodify(M.file, ':p:h')) == 0 then
+            fn.mkdir(fn.expand(fn.fnamemodify(M.file, ':p:h')), 'p')
+        end
+        local flags = ''
+        if fn.filereadable(M.file) == 1 then
+            flags = 'a'
+        end
+        fn.writefile({msg}, M.file, flags)
+    end
+
+end
+
+function M.warn(msg, ...)
+    if M.level <= 2 then
+        local time = fn.strftime('%H:%M:%S')
+        local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. levels[1] .. ' ] ' .. msg
+        if (M.silent == 0 and M.verbose >= 2) or select(1, ...) == 1 then
+            cmd('echohl WarningMsg')
+            cmd('echom "' .. log .. '"')
+            cmd('echohl None')
+        end
+        M.write(log)
+    end
+
+end
+
+function M.info(msg)
+    if M.level <= 1 then
+        local time = fn.strftime('%H:%M:%S')
+        local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. levels[1] .. ' ] ' .. msg
+        if M.silent == 0 and M.verbose >= 3 then
+            cmd('echom "' .. log .. '"')
+        end
+        M.write(log)
+    end
+end
+
+function M.set_name(name)
+    M.name = name
+end
+
+function M.get_name()
+    return M.name
+end
+
+function M.set_file(file)
+    M.file = file
+end
+
+
+
+return M

test/lua/logger.vader

@@ -0,0 +1,19 @@
+Execute ( SpaceVim lua api: logger ):
+  let cmp = SpaceVim#api#import('vim#compatible')
+  lua spacevim_logger = require('spacevim.api').import('logger')
+  lua spacevim_logger.set_name('TestLog')
+  AssertEqual cmp.luaeval('spacevim_logger.name'), 'TestLog'
+  lua spacevim_logger.info('info test')
+  lua spacevim_logger.warn('info test')
+  lua spacevim_logger.error('info test')
+  AssertEqual cmp.luaeval('#spacevim_logger.temp'), 3
+  lua spacevim_logger.set_level(2)
+  lua spacevim_logger.info('info test')
+  lua spacevim_logger.warn('info test')
+  lua spacevim_logger.error('info test')
+  AssertEqual cmp.luaeval('#spacevim_logger.temp'), 5
+  lua spacevim_logger.set_level(3)
+  lua spacevim_logger.info('info test')
+  lua spacevim_logger.warn('info test')
+  lua spacevim_logger.error('info test')
+  AssertEqual cmp.luaeval('#spacevim_logger.temp'), 6