feat: Adding slog support and handlers

[NucleoFusion]

resolves #717

Adding support for log/slog with flag based checking on output format or verbosity.

Changes

• Added Slog level based logging
  • By Default only WARN and ERROR levels will be shown.
  • On adding the --verbose flag shows INFO and DEBUG level as well.
• Removed dependency on cobra on handling errors, now logged via slog
• lipgloss based formatting for levels

EDIT

Changes

• No logs show for non-verbose
• Modified styles
• Flag logging in PersistentPreRunE

Added better formatting and color codes

[codecov]

Codecov Report

❌ Patch coverage is 2.02020% with 97 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.99%. Comparing base (60ad0bd) to head (29c6189).
⚠️ Report is 131 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/logger/handler.go	0.00%	76 Missing ⚠️
pkg/logger/logger.go	0.00%	11 Missing ⚠️
cmd/harbor/root/cmd.go	16.66%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #722      +/-   ##
=========================================
- Coverage   10.99%   7.99%   -3.00%     
=========================================
  Files         173     272      +99     
  Lines        8671   13256    +4585     
=========================================
+ Hits          953    1060     +107     
- Misses       7612   12082    +4470     
- Partials      106     114       +8     

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[NucleoFusion]

@bupd Did the stuff we discussed in the meet
Its under the EDIT section in the PR description

[Copilot]

Pull request overview

Adds a log/slog-based logging setup for the Harbor CLI, including a custom “pretty” handler with lipgloss-styled level rendering and initialization from the root command’s PersistentPreRunE.

Changes:

• Introduces a new pkg/logger package with Setup() and a custom PrettyHandler for slog output.
• Wires logger initialization into cmd/harbor/root/cmd.go and logs CLI flags at debug level.
• Supports JSON logging when the selected format is "json".

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
cmd/harbor/root/cmd.go	Initializes slog logging during CLI startup and emits a debug log of flags.
pkg/logger/logger.go	Adds a centralized slog setup function selecting JSON vs pretty handler.
pkg/logger/handler.go	Implements a custom pretty slog handler with colored level formatting and attribute printing.

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[bupd]

@NucleoFusion please address and mark reviews as resolved. I have also added my thoughts too.

hope it helps. thanks

[NucleoFusion]

@bupd changes have been made, you can take a look if you have time

[bupd]

@NucleoFusion looks like lint is failing.

[Copilot]

Pull request overview

This PR adds structured logging support to the Harbor CLI by migrating from logrus to Go's standard library log/slog. The changes introduce a custom pretty-print handler for text output, JSON handler support, and integrates logging setup into the root command initialization with a new --log-format flag to control output format.

Changes:

• Created new pkg/logger package with Setup function to initialize slog with custom handlers and a PrettyHandler for formatted text output with colored log levels via lipgloss
• Replaced logrus-based logging in cmd/harbor/root/cmd.go with slog-based setup, added --log-format flag with "text" and "json" options, and integrated flag logging in PersistentPreRunE
• Removed dependencies on logrus, io, and time imports where no longer needed

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pkg/logger/logger.go	New file establishing slog Setup function with format-based handler selection
pkg/logger/handler.go	New file implementing PrettyHandler for colored, formatted text logging output
cmd/harbor/root/cmd.go	Updated to use new slog-based logging with dedicated --log-format flag and flag logging in PersistentPreRunE

---

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[Copilot]

The --log-format flag does not validate that the format value is one of the supported options ("json" or "text"). Currently, any invalid value silently defaults to the text handler. Consider adding explicit validation in the Setup function to reject unsupported formats, or document this fallback behavior more clearly. According to the PR discussion, only "json" and "text" should be accepted values.

Suggested change

	if format == "json" {
	handler = slog.NewJSONHandler(outp, &slog.HandlerOptions{Level: slog.LevelDebug})
	} else {
	// Custom Text Handler
	handler = NewPrettyHandler(outp, slog.LevelDebug)
	switch format {
	case "json":
	handler = slog.NewJSONHandler(outp, &slog.HandlerOptions{Level: slog.LevelDebug})
	case "text":
	// Custom Text Handler
	handler = NewPrettyHandler(outp, slog.LevelDebug)
	default:
	panic(`unsupported log format: ` + format + `; supported formats are "json" and "text"`)

[NucleoFusion]

@bupd fixed lint