enable log output

1 files changed, 109 insertions, 0 deletions

diff --git a/xmake/core/base/log.lua b/xmake/core/base/log.lua
new file mode 100644
index 000000000..57f2dc1a2
--- /dev/null
+++ b/xmake/core/base/log.lua
@@ -0,0 +1,109 @@
+--!A cross-platform build utility based on Lua
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements.  See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership.  The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License.  You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+-- 
+-- Copyright (C) 2015 - 2017, TBOOX Open Source Group.
+--o
+-- @author      ruki
+-- @file        log.lua
+--
+
+-- define module: log
+local log = log or {}
+
+-- get the log file
+function log.file()
+    if log._FILE == nil then
+        local outputfile = log.outputfile()
+        if outputfile and os.isfile(outputfile) then
+            log._FILE = io.open(outputfile, 'w')
+        end
+        log._FILE = log._FILE or false
+    end
+    return log._FILE
+end
+
+-- get the output file
+function log.outputfile()
+    if log._LOGFILE == nil then
+        log._LOGFILE = os.getenv("XMAKE_LOGFILE") or false
+    end
+    return log._LOGFILE
+end
+
+-- flush log to file
+function log.flush()
+    local file = log.file()
+    if file then
+        file:flush()
+    end
+end
+
+-- close the log file
+function log.close()
+    local file = log.file()
+    if file then
+        file:close()
+    end
+end
+
+-- print log to the log file
+function log.print(...)
+    local file = log.file()
+    if file then
+        file:write(string.format(...) .. "\n")
+    end
+end
+
+-- print variables to the log file
+function log.printv(...)
+    local file = log.file()
+    if file then
+        local values = {...}
+        for i, v in ipairs(values) do
+            -- dump basic type
+            if type(v) == "string" or type(v) == "boolean" or type(v) == "number" then
+                file:write(tostring(v))
+            else
+                file:write("<" .. tostring(v) .. ">")
+            end
+            if i ~= #values then
+                file:write(" ")
+            end
+        end
+        file:write('\n')
+    end
+end
+
+-- printf log to the log file
+function log.printf(...)
+    local file = log.file()
+    if file then
+        file:write(string.format(...))
+    end
+end
+
+-- write log the log file
+function log:write(...)
+    local file = log.file()
+    if file then
+        file:write(...)
+    end
+end
+
+-- return module: log
+return log