Fix: Respect config file width values including width: 0

[gitpushoriginmaster]

Problem

The width setting in glow.yml is being ignored. When users set width: 0 to disable word wrapping, glow overrides it with auto-detected terminal width or defaults to 80. This forces users to pass -w 0 on every command invocation.

Current vs Expected Behavior

Input	Expected	Actual
glow -w 0	No wrapping	No wrapping (works)
width: 0 in glow.yml	No wrapping	80 or auto-detected (broken)
width: 100 in glow.yml	100 chars	80 or auto-detected (broken)

Root Cause

The validateOptions() function checks if the CLI flag was set, but not if the config file specified a value:

if !cmd.Flags().Changed("width") {
    // Runs auto-detection even when config file has width: 0
    if width == 0 {
        width = 80  // Overrides user's config
    }
}

This causes auto-detection to run and override explicit config file values.

Solution

Add one condition to skip auto-detection when config file sets width:

-if !cmd.Flags().Changed("width") { //nolint:nestif
+if !cmd.Flags().Changed("width") && !viper.IsSet("width") { //nolint:nestif

The viper.IsSet("width") check returns true when the key exists in the config file (even if set to 0), allowing us to distinguish between "user set it to 0" vs "uninitialized default of 0".

Why This Is Minimal

Single line change - only adds && !viper.IsSet("width") to existing condition.

Preserves all functionality:

• Auto-detection still works when nothing configured
• CLI flag remains highest priority
• Terminal width capping at 120 unchanged
• Default fallback to 80 unchanged

No breaking changes - users relying on auto-detection or CLI flags see no difference.

Correct Priority After Fix

1. CLI flag (highest)
2. Config file
3. Auto-detection (terminal width, capped at 120)
4. Default (80)

Test Scenarios

Scenario	Result
glow -w 0 file.md	No wrapping
width: 0 in config	No wrapping
width: 150 in config	150 chars (no capping)
Nothing configured, 80-col terminal	80 (auto-detected)
Nothing configured, 200-col terminal	120 (auto-detected, capped)
Nothing configured, no terminal	80 (default)
-w 50 with width: 100 in config	50 (CLI wins)