[Batch]Day/Night theme switch for Sumatra PDF

[custard-pi]

Auto Day/Night theme switch for Sumatra PDF (Github)

Sumatra PDF uses a text file(%LOCALAPPDATA%\SumatraPDF\SumatraPDF-settings.txt) to store all its settings.
In the settings file, "Theme = "string defines the theme used by the program, currently three themes are available:
"Theme = Light"
"Theme = Dark"
"Theme = Darker"

This script use FART (Find And Replace Text command line utility) to replace theme settings in the settings file, switching the theme.

1.Save the following batch script as a .bat file (e.g. C:\\Mydir\ThemeSwitch.bat).

REM Assuming your local app data directory is under C: drive
C:
cd  %LOCALAPPDATA%\SumatraPDF
IF "%1"=="-L" GOTO light
IF "%1"=="-D" GOTO dark
GOTO end

:light
"%~dp0\fart.exe" -w -q SumatraPDF-settings.txt "Theme = Darker" "Theme = Light"
GOTO end
:dark
"%~dp0\fart.exe" -w -q SumatraPDF-settings.txt "Theme = Light" "Theme = Darker"
:end

You can use "Theme = Dark" instead of "Theme = Darker" if you prefer the Dark theme as the night theme.
2. Download the latest release of FART, save the fart.exe in the same directory as the bat file(e.g. C:\\Mydir\fart.exe).
3. Paste the following content into scripts.yaml

Enabled: true
Component:
  Scripts:
  - Name: SumatraPDF
    Command: "{Path of the .bat}"
    ArgsLight: [-L]
    ArgsDark: [-D]
    AllowedSources: [Any]

replace{Path of the .bat} to the path of the bat file(e.g. C:\\Mydir\ThemeSwitch.bat).

[custard-pi]

rewrote with pwsh, no longer requires FART.

1. ThemeSwitch.ps1

#SumatraPDF Day/Night Mode Switcher
# Check the argument passed in
$argument = $args[0]

# Read the content of the config file
$configFile = "$env:LOCALAPPDATA\SumatraPDF\SumatraPDF-settings.txt"
$configContent = Get-Content $configFile

$preferedLightTheme = "Light" # Change this to your prefered light theme
$preferedDarkTheme = "Darker" # Change this to your prefered dark theme

# Perform different tasks based on the argument
switch ($argument) {
    "-L" {
        # Switch to dark theme
        # Find and replace the configuration
        $newConfigContent = $configContent -replace "^Theme = $preferedDarkTheme$", "Theme = $preferedLightTheme"
        # Write the updated content back to the config file
        $newConfigContent | Set-Content $configFile
    }
    "-D" {
        # Switch to light theme
        # Find and replace the configuration
        $newConfigContent = $configContent -replace "^Theme = $preferedLightTheme$", "Theme = $preferedDarkTheme"
        # Write the updated content back to the config file
        $newConfigContent | Set-Content $configFile
    }
    default {
        Write-Host "Invalid argument."
    }
}

2.scripts.yaml

Enabled: true
Component:
  Scripts:
  - Name: SumatraPDF
    Command: pwsh
    WorkingDirectory: "{directory where ThemeSwitch.ps1 is stored in}"
    ArgsLight: [./ThemeSwitch.ps1, -L]
    ArgsDark: [./ThemeSwitch.ps1, -D]
    AllowedSources: [Any]