Add /f for fast init. (#1942)

The below enables Cmder Fast Init mode for `cmd.exe` sessions.  This is more like the Cmder 1.3.5 init process.  See issue #1821 

Cmder Fast Init mode bypasses or disables the following Cmder 1.3.6+ features:

* Git root and version detection.  Defaults to `%cmder_root%\vendor\git-for-windows` if it exists.
* Path enhance validation before path modify so `%Path%` enhancements are forced.
* Recursive path add for `"%CMDER_ROOT%\bin"`
* Recursive path add for `"%CMDER_USER_BIN%\bin"` if `/c [user_config_folder` is specified.
* `/d` switch to enable debug output.
* `/v` switch to enable debug output.

Add `/f` to Cmder task as shown below t enable fast init:

_Note 1: This setting is invalid in Cmder `Powershell` and `Bash` sessions~_

_Note 2: Add `/t` also to see init timer output_

![image](https://user-images.githubusercontent.com/7318053/47957637-052e3880-df90-11e8-93ef-91e1ab696d82.png)

Cuts ~2.4 seconds off of init time.

![image](https://user-images.githubusercontent.com/7318053/47957795-45db8100-df93-11e8-8ae0-551d12c4e2dc.png)

README.md

@@ -138,17 +138,18 @@ You may find some Monokai color schemes for mintty to match Cmder [here](https:/
 
 ##### Command Line Arguments for `init.bat`
 
-| Argument                        | Description                                                                                      | Default                               |
+| Argument                        | Description                                                                                                                                        | Default                                |
-| -----------------------------   | ----------------------------------------------------------------------------------------------   | ------------------------------------- |
+| -----------------------------   | ----------------------------------------------------------------------------------------------                                                     | -------------------------------------  |
-| `/c [user cmder root]`          | Enables user bin and config folders for 'Cmder as admin' sessions due to non-shared environment. | not set                               |
+| `/c [user cmder root]`          | Enables user bin and config folders for 'Cmder as admin' sessions due to non-shared environment.                                                   | not set                                |
-| `/d`                            | Enables debug output.                                                                            | not set                               |
+| `/d`                            | Enables debug output.                                                                                                                              | not set                                |
-| `/git_install_root [file path]` | User specified Git installation root path.                                                       | `%CMDER_ROOT%\vendor\Git-for-Windows` |
+| `/f`                            | Enables Cmder Fast Init Mode. This disables some features, see pull request [#1492](https://github.com/cmderdev/cmder/pull/1942) for more details. | not set                                |
-| `/home [home folder]`           | User specified folder path to set `%HOME%` environment variable.                                 | `%userprofile%`                       |
+| `/git_install_root [file path]` | User specified Git installation root path.                                                                                                         | `%CMDER_ROOT%\vendor\Git-for-Windows`  |
-| `/max_depth [1-5]`              | Define max recurse depth when adding to the path for `%cmder_root%\bin` and `%cmder_user_bin%`   | 1                                     |
+| `/home [home folder]`           | User specified folder path to set `%HOME%` environment variable.                                                                                   | `%userprofile%`                        |
-| `/svn_ssh [path to ssh.exe]`    | Define `%SVN_SSH%` so we can use git svn with ssh svn repositories.                              | `%GIT_INSTALL_ROOT%\bin\ssh.exe`      |
+| `/max_depth [1-5]`              | Define max recurse depth when adding to the path for `%cmder_root%\bin` and `%cmder_user_bin%`                                                     | 1                                      |
-| `/user_aliases [file path]`     | File path pointing to user aliases.                                                              | `%CMDER_ROOT%\config\user-aliases.cmd` |
+| `/svn_ssh [path to ssh.exe]`    | Define `%SVN_SSH%` so we can use git svn with ssh svn repositories.                                                                                | `%GIT_INSTALL_ROOT%\bin\ssh.exe`       |
-| `/v`                            | Enables verbose output.                                                                          | not set                               |
+| `/user_aliases [file path]`     | File path pointing to user aliases.                                                                                                                | `%CMDER_ROOT%\config\user-aliases.cmd` |
-| (custom arguments)              | User defined arguments processed by `cexec`. Type `cexec /?` for more useage.                    | not set                               |
+| `/v`                            | Enables verbose output.                                                                                                                            | not set                                |
+| (custom arguments)              | User defined arguments processed by `cexec`. Type `cexec /?` for more useage.                                                                      | not set                                |
 
 ### Cmder Shell User Config
 Single user portable configuration is possible using the cmder specific shell config files.  Edit the below files to add your own configuration:

vendor/init.bat

@@ -12,6 +12,7 @@ set cmder_init_start=%time%
 set verbose_output=0
 set debug_output=0
 set time_init=0
+set fast_init=0
 set max_depth=1
 set "CMDER_USER_FLAGS= "
 
@@ -41,7 +42,9 @@ call "%cmder_root%\vendor\lib\lib_profile"
 :var_loop
     if "%~1" == "" (
         goto :start
-    ) else if /i "%1"=="/t" (
+    ) else if /i "%1" == "/f" (
+        set fast_init=1
+    ) else if /i "%1" == "/t" (
         set time_init=1
     ) else if /i "%1"=="/v" (
         set verbose_output=1
@@ -147,6 +150,11 @@ if not defined TERM set TERM=cygwin
 setlocal enabledelayedexpansion
 if defined GIT_INSTALL_ROOT (
     if exist "%GIT_INSTALL_ROOT%\cmd\git.exe" goto :SPECIFIED_GIT
+) else if "%fast_init%" == "1" (
+    if exist "%CMDER_ROOT%\vendor\git-for-windows\cmd\git.exe" (
+      %lib_console% debug_output "Skipping Git Auto-Detect!"
+      goto :VENDORED_GIT
+    )
 )
 
 %lib_console% debug_output init.bat "Looking for Git install root..."
@@ -208,7 +216,6 @@ for /F "delims=" %%F in ('where git.exe 2^>nul') do (
 if exist "%CMDER_ROOT%\vendor\git-for-windows" (
     set "GIT_INSTALL_ROOT=%CMDER_ROOT%\vendor\git-for-windows"
     %lib_console% debug_output "Using vendored Git from '!GIT_INSTALL_ROOT!..."
-    %lib_path% enhance_path "!GIT_INSTALL_ROOT!\cmd"
     goto :CONFIGURE_GIT
 ) else (
     goto :NO_GIT

vendor/lib/lib_console.cmd

@@ -1,6 +1,6 @@
 @echo off
 
-rem set args=%*
+if "%fast_init%" == "1" exit /b
 
 call "%~dp0lib_base.cmd"
 set lib_console=call "%~dp0lib_console.cmd"

vendor/lib/lib_git.cmd

@@ -1,11 +1,9 @@
 @echo off
 
-
 call "%~dp0lib_base.cmd"
 call "%%~dp0lib_console.cmd"
 set lib_git=call "%~dp0lib_git.cmd"
 
-
 if "%~1" == "/h" (
     %lib_base% help "%~0"
 ) else if "%1" neq "" (

vendor/lib/lib_path.cmd

@@ -52,6 +52,15 @@ exit /b
         set "position="
     )
 
+    if "%fast_init%" == "1" (
+      if "%position%" == "append" (
+        set "PATH=%PATH%;%add_path%"
+      ) else (
+        set "PATH=%add_path%;%PATH%"
+      )
+      goto :end_enhance_path
+    )
+
     set found=0
     set "find_query=%add_path%"
     set "find_query=%find_query:\=\\%"
@@ -85,6 +94,7 @@ exit /b
         %lib_console% debug_output  :enhance_path "AFTER Env Var - PATH=!path!"
     )
 
+    :end_enhance_path
     endlocal & set "PATH=%PATH:;;=;%"
     exit /b
 
@@ -115,7 +125,6 @@ exit /b
 :::.
 :::  path       <out> Sets the path env variable if required.
 :::-------------------------------------------------------------------------------
-
     setlocal enabledelayedexpansion
     if "%~1" neq "" (
         set "add_path=%~1"
@@ -136,6 +145,11 @@ exit /b
         set "position="
     )
 
+    if "%fast_init%" == "1" (
+      call :enhance_path "%add_path%" %position%
+      goto :end_enhance_path_recursive
+    )
+
     if "%depth%" == "" set depth=0
 
     %lib_console% debug_output  :enhance_path_recursive "Env Var - add_path=%add_path%"
@@ -155,5 +169,6 @@ exit /b
         )
     )
 
+    :end_enhance_path_recursive
     endlocal & set "PATH=%PATH%"
     exit /b

vendor/lib/lib_profile.cmd

@@ -1,6 +1,5 @@
 @echo off
 
-
 call "%~dp0lib_base.cmd"
 call "%%~dp0lib_console"
 set lib_profile=call "%~dp0lib_profile.cmd"