dyn2py-installer.iss

[Setup]
AppId={{E924F481-6909-43F8-8469-11155A5EB9A2}
AppName=dyn2py
AppVersion=x.x.x
AppPublisher=infeeeee
AppPublisherURL=https://github.com/infeeeee/dyn2py
AppSupportURL=https://github.com/infeeeee/dyn2py/issues
AppUpdatesURL=https://github.com/infeeeee/dyn2py/releases/latest
DefaultDirName={autopf}\dyn2py
DisableProgramGroupPage=auto
DefaultGroupName=dyn2py
LicenseFile=LICENSE
PrivilegesRequired=admin
OutputBaseFilename=dyn2py-installer
Compression=lzma
SolidCompression=yes
WizardStyle=modern
ChangesEnvironment=yes

[Languages]
Name: "english"; MessagesFile: "compiler:Default.isl"

[Files]
Source: "dyn2py.exe"; DestDir: "{app}"; Flags: ignoreversion

[Icons]
Name: "{group}\dyn2py (cmd)"; Filename: "{cmd}"; WorkingDir: "{userdocs}"; Parameters: "/k dyn2py -h"
Name: "{group}\dyn2py (powershell)"; Filename: "powershell"; WorkingDir: "{userdocs}"; Parameters: "-noexit -command dyn2py -h"

[Code]
const EnvironmentKey = 'SYSTEM\CurrentControlSet\Control\Session Manager\Environment';

procedure EnvAddPath(Path: string);
var
    Paths: string;
begin
    { Retrieve current path (use empty string if entry not exists) }
    if not RegQueryStringValue(HKEY_LOCAL_MACHINE, EnvironmentKey, 'Path', Paths)
    then Paths := '';

    { Skip if string already found in path }
    if Pos(';' + Uppercase(Path) + ';', ';' + Uppercase(Paths) + ';') > 0 then exit;

    { App string to the end of the path variable }
    Paths := Paths + ';'+ Path +';'

    { Overwrite (or create if missing) path environment variable }
    if RegWriteStringValue(HKEY_LOCAL_MACHINE, EnvironmentKey, 'Path', Paths)
    then Log(Format('The [%s] added to PATH: [%s]', [Path, Paths]))
    else Log(Format('Error while adding the [%s] to PATH: [%s]', [Path, Paths]));
end;

procedure EnvRemovePath(Path: string);
var
    Paths: string;
    P: Integer;
begin
    { Skip if registry entry not exists }
    if not RegQueryStringValue(HKEY_LOCAL_MACHINE, EnvironmentKey, 'Path', Paths) then
        exit;

    { Skip if string not found in path }
    P := Pos(';' + Uppercase(Path) + ';', ';' + Uppercase(Paths) + ';');
    if P = 0 then exit;

    { Update path variable }
    Delete(Paths, P - 1, Length(Path) + 1);

    { Overwrite path environment variable }
    if RegWriteStringValue(HKEY_LOCAL_MACHINE, EnvironmentKey, 'Path', Paths)
    then Log(Format('The [%s] removed from PATH: [%s]', [Path, Paths]))
    else Log(Format('Error while removing the [%s] from PATH: [%s]', [Path, Paths]));
end;


procedure CurStepChanged(CurStep: TSetupStep);
begin
    if CurStep = ssPostInstall 
     then EnvAddPath(ExpandConstant('{app}'));
end;

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
begin
    if CurUninstallStep = usPostUninstall
    then EnvRemovePath(ExpandConstant('{app}'));
end;