My Visual Studio settings/scripts for adding TortoiseGit Diff, Log, and Blame buttons.

AddTgitButtonsToVs.md

Adding TortoiseGit Buttons to Visual Studio

NoShell.vbs

If WScript.Arguments.Count >= 1 Then
    ReDim arr(WScript.Arguments.Count-1)
    For i = 0 To WScript.Arguments.Count-1
        Arg = WScript.Arguments(i)
        If InStr(Arg, " ") > 0 Then Arg = """" & Arg & """"
      arr(i) = Arg
    Next

    RunCmd = Join(arr)
    CreateObject("Wscript.Shell").Run RunCmd, 0, True
End If

tgit.bat

@echo off

setlocal
set CMD=%1

shift

if "%1"=="" GOTO NOPATH
rem Ensure casing of path parameter is correct & fully-qualified
pushd .
cd %~dp0
set TGPATH=%~f1
popd

shift
GOTO EXEC

:NOPATH
set TGPATH=.

:EXEC

set "args="
:parse
if "%~1" neq "" (
  set args=%args% %1
  shift
  goto :parse
)
if defined args set args=%args:~1%

"c:\Program Files\TortoiseGit\bin\TortoiseGitProc.exe" /command:%CMD% /path:"%TGPATH%" %args%

Toolbar.vssettings

<?xml version="1.0" encoding="UTF-8"?>
<UserSettings>
  <ApplicationIdentity version="15.0" />
  <ToolsOptions />
  <Category name="Environment_Group" RegisteredName="Environment_Group">
    <Category name="Environment_CommandBars" Category="{B9D9C123-B500-4202-B887-57C829CBD08F}" Package="{DA9FB551-C724-11d0-AE1F-00A0C90FFFC3}" RegisteredName="Environment_CommandBars" PackageName="Visual Studio Environment Package">
      <CommandBars Version="05072811">
        <UserCustomizations>
          <add Cmd="{5EFC7975-14BC-11CF-9B2B-00AA00573819}:00000276" CmdPri="00120001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" />
          <add Cmd="{5EFC7975-14BC-11CF-9B2B-00AA00573819}:00000277" CmdPri="00240001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" />
          <add Cmd="{5EFC7975-14BC-11CF-9B2B-00AA00573819}:00000278" CmdPri="005a0001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" />
          <add Cmd="{1496A755-94DE-11D0-8C3F-00C04FC2AAE2}:0000008f" CmdPri="00900001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" />
          <modify Cmd="{5EFC7975-14BC-11CF-9B2B-00AA00573819}:00000276" CmdPri="00120001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" Name="TGit Log" />
          <modify Cmd="{5EFC7975-14BC-11CF-9B2B-00AA00573819}:00000277" CmdPri="00240001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" Name="TGit Diff" />
          <modify Cmd="{5EFC7975-14BC-11CF-9B2B-00AA00573819}:00000278" CmdPri="005a0001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" Name="TGit Blame" />
          <modify Cmd="{1496A755-94DE-11D0-8C3F-00C04FC2AAE2}:0000008f" CmdPri="00900001" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" Name="Format" Style="3" BeginGroup="true" />
          <modify Cmd="{1496A755-94DE-11D0-8C3F-00C04FC2AAE2}:00000074" CmdPri="01200000" Group="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:00000550" GroupPri="01000000" Menu="{9ADF33D0-8AAD-11D0-B606-00A0C922E851}:0000000e" BeginGroup="true" />
        </UserCustomizations>
      </CommandBars>
    </Category>
  </Category>
</UserSettings>

VsExternalToolsTgit.vssettings

<UserSettings>
  <ApplicationIdentity version="14.0" />
  <ToolsOptions />
  <Category name="Environment_Group" RegisteredName="Environment_Group">
    <Category name="Environment_ExternalTools" Category="{E8FAE9E8-FBA2-4474-B134-AB0FFCFB291D}" Package="{DA9FB551-C724-11d0-AE1F-00A0C90FFFC3}" RegisteredName="Environment_ExternalTools" PackageName="Visual Studio Environment Package">
      <ExternalTools>
        <UserCreatedTool>
          <Arguments>c:\tools\NoShell.vbs c:\tools\tgit.bat log $(ItemPath)</Arguments>
          <CloseOnExit>false</CloseOnExit>
          <Command>%vsspv_windows_sdk_dir%C:\Windows\System32\wscript.exe</Command>
          <Index>0</Index>
          <InitialDirectory>%vsspv_windows_sdk_dir%$(ItemDir)</InitialDirectory>
          <IsGUIapp>true</IsGUIapp>
          <NameID>0</NameID>
          <Package>{00000000-0000-0000-0000-000000000000}</Package>
          <PromptForArguments>false</PromptForArguments>
          <SaveAllDocs>true</SaveAllDocs>
          <Title>TGit Log</Title>
          <Unicode>false</Unicode>
          <UseOutputWindow>false</UseOutputWindow>
          <UseTaskList>false</UseTaskList>
        </UserCreatedTool>
        <UserCreatedTool>
          <Arguments>c:\tools\NoShell.vbs c:\tools\tgit.bat diff $(ItemPath)</Arguments>
          <CloseOnExit>false</CloseOnExit>
          <Command>%vsspv_windows_sdk_dir%C:\Windows\System32\wscript.exe</Command>
          <Index>1</Index>
          <InitialDirectory>%vsspv_windows_sdk_dir%</InitialDirectory>
          <IsGUIapp>true</IsGUIapp>
          <NameID>0</NameID>
          <Package>{00000000-0000-0000-0000-000000000000}</Package>
          <PromptForArguments>false</PromptForArguments>
          <SaveAllDocs>true</SaveAllDocs>
          <Title>TGit Diff</Title>
          <Unicode>false</Unicode>
          <UseOutputWindow>false</UseOutputWindow>
          <UseTaskList>false</UseTaskList>
        </UserCreatedTool>
        <UserCreatedTool>
          <Arguments>c:\tools\NoShell.vbs c:\tools\tgit.bat blame $(ItemPath)</Arguments>
          <CloseOnExit>false</CloseOnExit>
          <Command>%vsspv_windows_sdk_dir%C:\Windows\System32\wscript.exe</Command>
          <Index>2</Index>
          <InitialDirectory>%vsspv_windows_sdk_dir%</InitialDirectory>
          <IsGUIapp>true</IsGUIapp>
          <NameID>0</NameID>
          <Package>{00000000-0000-0000-0000-000000000000}</Package>
          <PromptForArguments>false</PromptForArguments>
          <SaveAllDocs>true</SaveAllDocs>
          <Title>Tgit Blame</Title>
          <Unicode>false</Unicode>
          <UseOutputWindow>false</UseOutputWindow>
          <UseTaskList>false</UseTaskList>
        </UserCreatedTool>
        <ExcludeRegisteredTool SourceKeyName="Error Loo&amp;kup" />
        <ExcludeRegisteredTool SourceKeyName="Create GUID" />
        <ExcludeRegisteredTool SourceKeyName="PreEmptive Protection - Dot&amp;fuscator" />
      </ExternalTools>
    </Category>
  </Category>
</UserSettings>

The VsExternalToolsTgit.vssettings gets imported into Visual Studio; the scripts go in a directory at c:\tools.