build: improve windows installer

1) Automatically update installer version by using dvc.main.VERSION
2) Make build.cmd more verbose and handle errors better

build.cmd

@@ -1,27 +1,45 @@
 @echo OFF
 
+echo ====== Starting to build dvc installer for Windows... ======
+
 rmdir /Q /S dist
 rmdir /Q /S WinPython
 del /Q /S "dvc-*.exe"
 
-if not exist WinPython-64bit-3.6.1.0Zero.exe (echo Error: Couldn't find WinPython installer. Please go to winpython.github.io, download WinPython-64bit-3.6.1.0Zero.exe and place it in project's root directory && goto:eof)
+if not exist WinPython-64bit-3.6.1.0Zero.exe (echo Error: Couldn't find WinPython installer. Please go to winpython.github.io, download WinPython-64bit-3.6.1.0Zero.exe and place it in project's root directory && goto:error)
+
+if not exist "C:\Program Files (x86)\Inno Setup 5\ISCC.exe" (echo Error: Couldn't find Inno Setup compiler. Please go to jrsoftware.org/isinfo.php and install Inno Setup 5 && goto:error)
+
+echo ====== Installing WinPython... ======
+call .\WinPython-64bit-3.6.1.0Zero.exe /S /D=%cd%\WinPython || goto :error
 
-if not exist "C:\Program Files (x86)\Inno Setup 5\ISCC.exe" (echo Error: Couldn't find Inno Setup compiler. Please go to jrsoftware.org/isinfo.php and install Inno Setup 5 && goto:eof)
+echo ====== Copying additional files... ======
+copy innosetup\addSymLinkPermissions.ps1 WinPython\ || goto :error
+mkdir Winpython\bin || goto :error
+copy innosetup\dvc.bat WinPython\bin || goto :error
 
-call .\WinPython-64bit-3.6.1.0Zero.exe /S /D=%cd%\WinPython
+echo ====== Installing requirements... ======
+cd WinPython || goto :error
+call scripts\python -m pip install -r ..\requirements.txt || goto :error
+cd .. || goto :error
 
-copy innosetup\addSymLinkPermissions.ps1 WinPython\
-mkdir Winpython\bin
-copy innosetup\dvc.bat WinPython\bin
+echo ====== Building dvc sdist... ======
+call WinPython\scripts\python setup.py sdist || goto :error
 
-cd WinPython
-call scripts\python -m pip install -r ..\requirements.txt
-cd ..
+echo ====== Installing dvc sdist into WinPython... ======
+cd WinPython || goto :error
+for %%s in ("..\dist\dvc-*.tar.gz") do call scripts\python -m pip install "%%s" || goto :error
+cd .. || goto :error
 
-call WinPython\scripts\python setup.py sdist
+echo ====== Building dvc installer... ======
+cd innosetup || goto :error
+call ..\WinPython\scripts\python config_gen.py || goto :error
+cd .. || goto :error
+call "C:\Program Files (x86)\Inno Setup 5\iscc" innosetup\setup.iss || goto :error
 
-cd WinPython
-call scripts\python -m pip install ..\dist\dvc-0.8.2.tar.gz
-cd ..
+echo ====== DONE ======
+goto :EOF
 
-call "C:\Program Files (x86)\Inno Setup 5\iscc" innosetup\setup.iss
+:error
+echo ====== FAIL ======
+exit /b 1

innosetup/config_gen.py

@@ -0,0 +1,14 @@
+# This script generates config.ini for setup.iss script
+from dvc.main import VERSION
+
+try:
+    import configparser as ConfigParser
+except ImportError:
+    import ConfigParser
+
+config = ConfigParser.ConfigParser()
+config.add_section('Version')
+config.set('Version', 'Version', VERSION)
+
+with open('config.ini', 'w') as f:
+    config.write(f)

innosetup/setup.iss

@@ -1,6 +1,6 @@
 #define MyAppName "Data Version Control"
 ; FIXME: Hardcoded version is not nice, but will do for now.
-#define MyAppVersion "0.8.2"
+#define MyAppVersion ReadIni(".\innosetup\config.ini", "Version", "version", "unknown")
 #define MyAppPublisher "Dmitry Petrov"
 #define MyAppURL "https://dataversioncontrol.com/"
 ;#define MyAppExeName "dvc.exe"