gitcontrib

var AuthorChangesCmd = &Z.Cmd{
	Name:    `authorchanges`,
	Summary: `lists the line changes per author in current branch`,
	Aliases: []string{"ach"},
	Call: func(_ *Z.Cmd, _ ...string) error {

		w := new(tabwriter.Writer)

		w.Init(os.Stdout, 8, 8, 0, '\t', 0)
		defer w.Flush()

		fmt.Fprintf(w, " %s\t%s\t%s\n", "Author", "Additions", "Deletions")
		fmt.Fprintf(w, " %s\t%s\t%s\n", "------", "---------", "---------")
		for k, v := range MapLineChanges() {
			fmt.Fprintf(w, " %s\t%d\t%d\n", k, v.Additions, v.Deletions)
		}

		return nil
	},
	Commands: []*Z.Cmd{help.Cmd},
}

var AuthorCommitsCmd = &Z.Cmd{
	Name:    `authorcommits`,
	Summary: `lists the number of commits per author in current dir`,
	Aliases: []string{"ac"},
	Call: func(_ *Z.Cmd, _ ...string) error {

		w := new(tabwriter.Writer)

		w.Init(os.Stdout, 8, 8, 0, '\t', 0)
		defer w.Flush()

		fmt.Fprintf(w, " %s\t%s\n", "Author", "Commits")
		fmt.Fprintf(w, " %s\t%s\n", "------", "-------")
		for k, v := range AuthorCommits() {
			fmt.Fprintf(w, " %s\t%d\n", k, v)
		}

		return nil
	},
	Commands: []*Z.Cmd{help.Cmd},
}

var Cmd = &Z.Cmd{

	Name:      `gitcontrib`,
	Summary:   `a command tree branch for analysing git author contributions`,
	Version:   `v0.2.0`,
	Copyright: `Copyright 2023 Svein-Kåre Bjørnsen`,
	License:   `Apache-2.0`,
	Source:    `git@git.gvk.idi.ntnu.no:morngrar/gitcontrib.git`,
	Issues:    `https://git.gvk.idi.ntnu.no/morngrar/gitcontrib/-/issues`,

	Commands: []*Z.Cmd{

		help.Cmd,

		AuthorChangesCmd, AuthorCommitsCmd, ContributionSummaryCmd,
		CsvCmd,
	},

	Dynamic: template.FuncMap{
		"uname": func(_ *Z.Cmd) string { return Z.Out("uname", "-a") },
		"dir":   func() string { return Z.Out("dir") },
		"pwd":   func() string { return Z.Out("pwd") },
	},

	Description: `
		The {{aka}} command is a command tree for analysing author
		contributions in git repositories. The most extensive overview is the
		'summary' subcommand, that has the alias 's'. This shows aggregated
		metrics like line change ratio and commit granularity per author.
		Larger numbers means higher contribution for all categories.
		`,
}

var ContributionSummaryCmd = &Z.Cmd{
	Name:    `summary`,
	Summary: `lists commits, line changes and aggregated metrics`,
	Aliases: []string{"s"},
	Call: func(_ *Z.Cmd, _ ...string) error {

		commitMap := AuthorCommits()
		lineChangesMap := MapLineChanges()
		commitRatioMap := make(map[string]float64)
		lineRatioMap := make(map[string]float64)
		granularityMap := make(map[string]float64)

		commitTotal := 0
		for _, v := range commitMap {
			commitTotal += v
		}

		lineTotal := 0
		for _, v := range lineChangesMap {
			lineTotal += v.Sum()
		}

		for k, v := range lineChangesMap {
			linesum := v.Sum()
			lineRatio := float64(linesum) / float64(lineTotal)
			lineRatioMap[k] = lineRatio
			commitRatio := float64(commitMap[k]) / float64(commitTotal)
			commitRatioMap[k] = commitRatio
			granularityMap[k] = 1.0 / (float64(linesum) / float64(commitMap[k]))
		}

		w := new(tabwriter.Writer)

		w.Init(os.Stdout, 8, 8, 0, '\t', 0)

		fmt.Fprintf(w, " %s\t%s\t%s\t%s\t%s\t%s\t%s\n", "Author", "Commits", "Additions", "Deletions", "Line ratio", "Commit ratio", "Granularity")
		fmt.Fprintf(w, " %s\t%s\t%s\t%s\t%s\t%s\t%s\n", "------", "-------", "---------", "---------", "----------", "------------", "-----------")
		for k, v := range MapLineChanges() {
			fmt.Fprintf(w, " %s\t%v\t%v\t%v\t%.3f\t%.3f\t%.3f\n", k, commitMap[k], v.Additions, v.Deletions, lineRatioMap[k], commitRatioMap[k], granularityMap[k])
		}
		err := w.Flush()
		if err != nil {
			return fmt.Errorf("failed to flush output buffer: %w", err)
		}

		fmt.Printf(
			"\n Overall repo commit granularity: %.3f\n",
			1.0/(float64(lineTotal)/float64(commitTotal)),
		)

		return nil
	},
	Commands: []*Z.Cmd{help.Cmd},
}

var CsvAuthorChangesCmd = &Z.Cmd{
	Name:    `authorchanges`,
	Summary: `outputs CSV rows of the line changes per author in current branch`,
	Aliases: []string{"ach"},
	Description: `
		The {{aka}} subcommand gives the same output data as the  root
		subcommand of the same name, however, this one outputs CSV rows instead
		of the human-readable tabulated output of the original command. The
		first field of each row is the name of the repo directory itself, the
		rest follow the same order as the original command. Strings are wrapped
		in double quotes, and the CSV header is not printed to accomodate
		scripting.

		The fields of this command is the following, in the given order:

		Repo directory, Author, Additions, Deletions
		`,
	Call: func(_ *Z.Cmd, _ ...string) error {

		reponame, err := getRepoDirName()
		if err != nil {
			return fmt.Errorf("error getting repo name: %w", err)
		}

		for k, v := range MapLineChanges() {
			fmt.Printf(
				"\"%s\",\"%s\",%d,%d\n",
				reponame, k, v.Additions, v.Deletions,
			)
		}

		return nil
	},
	Commands: []*Z.Cmd{help.Cmd},
}

var CsvAuthorCommitsCmd = &Z.Cmd{
	Name:    `authorcommits`,
	Summary: `outputs CSV rows with the number of commits per author in current dir`,
	Aliases: []string{"ac"},
	Description: `
		The {{aka}} subcommand gives the same output data as the  root
		subcommand of the same name, however, this one outputs CSV rows instead
		of the human-readable tabulated output of the original command. The
		first field of each row is the name of the repo directory itself, the
		rest follow the same order as the original command. Strings are wrapped
		in double quotes, and the CSV header is not printed to accomodate
		scripting.

		The fields of this command is the following, in the given order:

		Repo directory, Author, Commits
		`,
	Call: func(_ *Z.Cmd, _ ...string) error {

		reponame, err := getRepoDirName()
		if err != nil {
			return fmt.Errorf("error getting repo name: %w", err)
		}

		for k, v := range AuthorCommits() {
			fmt.Printf("\"%s\",\"%s\",%d\n", reponame, k, v)
		}

		return nil
	},
	Commands: []*Z.Cmd{help.Cmd},
}

var CsvCmd = &Z.Cmd{
	Name:    `csv`,
	Summary: `outputs CSV rows for the various report`,
	Aliases: []string{"c"},
	Commands: []*Z.Cmd{

		help.Cmd,

		CsvAuthorChangesCmd, CsvAuthorCommitsCmd, CsvContributionSummaryCmd,
	},
	Description: `
		The {{aka}} subcommand supplies the same commands as the root command, 
		however, these output CSV rows instead of the human-readable tabulated
		output of the original commands. The first field of each row is the
		name of the repo directory itself, the rest follow the same order as 
		the original command. Strings are wrapped in double quotes.

		Do 'cmd COMMAND help' for further details.
		`,
}

var CsvContributionSummaryCmd = &Z.Cmd{
	Name:    `summary`,
	Summary: `outputs CSV rows for the 'summary' report`,
	Aliases: []string{"s"},
	Description: `

		The {{aka}} subcommand gives the same output data as the  root
		subcommand of the same name, however, this one outputs CSV rows instead
		of the human-readable tabulated output of the original command. The
		first field of each row is the name of the repo directory itself, the
		rest follow the same order as the original command. Strings are wrapped
		in double quotes, and the CSV header is not printed to accomodate
		scripting.

		The fields of this command is the following, in the given order:

		Repo directory, Author, Commits, Additions, Deletions, Line ratio,
		Commit ratio, Granularity.
		`,

	Call: func(_ *Z.Cmd, _ ...string) error {

		commitMap := AuthorCommits()
		lineChangesMap := MapLineChanges()
		commitRatioMap := make(map[string]float64)
		lineRatioMap := make(map[string]float64)
		granularityMap := make(map[string]float64)

		commitTotal := 0
		for _, v := range commitMap {
			commitTotal += v
		}

		lineTotal := 0
		for _, v := range lineChangesMap {
			lineTotal += v.Sum()
		}

		for k, v := range lineChangesMap {
			linesum := v.Sum()
			lineRatio := float64(linesum) / float64(lineTotal)
			lineRatioMap[k] = lineRatio
			commitRatio := float64(commitMap[k]) / float64(commitTotal)
			commitRatioMap[k] = commitRatio
			granularityMap[k] = 1.0 / (float64(linesum) / float64(commitMap[k]))
		}

		reponame, err := getRepoDirName()
		if err != nil {
			return fmt.Errorf("error getting repo name: %w", err)
		}

		for k, v := range MapLineChanges() {
			fmt.Printf("\"%s\",\"%s\",%v,%v,%v,%.3f,%.3f,%.3f\n", reponame, k, commitMap[k], v.Additions, v.Deletions, lineRatioMap[k], commitRatioMap[k], granularityMap[k])
		}

		return nil
	},
	Commands: []*Z.Cmd{help.Cmd},
}