From 255c624b733e44e39392dd565da55d6f2350076f Mon Sep 17 00:00:00 2001
From: Özgür Kesim <oec@kesim.org>
Date: Thu, 28 Nov 2024 18:27:59 +0100
Subject: parallel rendering of WP Totals

---
 zeitgeist.go | 125 ++++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 103 insertions(+), 22 deletions(-)

(limited to 'zeitgeist.go')

diff --git a/zeitgeist.go b/zeitgeist.go
index 643f0e2..9dc6e67 100644
--- a/zeitgeist.go
+++ b/zeitgeist.go
@@ -15,6 +15,7 @@ import (
 	"slices"
 	"strconv"
 	"strings"
+	"sync"
 	"text/template"
 	"time"
 )
@@ -593,25 +594,28 @@ func (p *Project) readTimelogs(dir string) error {
 
 //go:embed templates/*.t
 var embedFS embed.FS
+var once sync.Once
+var templates *template.Template
 
 func (p *Project) printReport(name string) {
-	var tmp *template.Template
 	var e error
 
-	if *fl_templates != "" {
-		tmp, e = template.ParseGlob(*fl_templates + "/*.t")
-	} else {
-		tmp, e = template.ParseFS(embedFS, "templates/*.t")
-	}
-	if e != nil {
-		log.Fatalf("Couldn't parse templates: %v\n", e)
-	}
+	once.Do(func() {
+		if *fl_templates != "" {
+			templates, e = template.ParseGlob(*fl_templates + "/*.t")
+		} else {
+			templates, e = template.ParseFS(embedFS, "templates/*.t")
+		}
+		if e != nil {
+			log.Fatalf("Couldn't parse templates: %v\n", e)
+		}
+	})
 
-	if nil == tmp.Lookup(name) {
+	if nil == templates.Lookup(name) {
 		log.Fatalf("Couldn't find template %q\n", name)
 	}
 
-	e = tmp.ExecuteTemplate(os.Stdout, name, p)
+	e = templates.ExecuteTemplate(os.Stdout, name, p)
 	if e != nil {
 		log.Fatalf("Couldn't execute template %q: %v\n", name, e)
 	}
@@ -815,7 +819,7 @@ type Totals struct {
 }
 
 type WPTotals struct {
-	*Totals
+	Totals
 	Tasks map[string]*Totals
 }
 
@@ -854,23 +858,100 @@ func (p *Project) TotalWPTask(wp, task string) (to *Totals, e error) {
 	return to, nil
 }
 
-func (p *Project) TotalWP(name string) (t *Totals, e error) {
+func (p *Project) TotalWP(name string) (tot *WPTotals, e error) {
 	wp, ok := p.Workpackages[name]
 	if !ok {
 		return nil, fmt.Errorf("no such workpackage handle: %q", name)
 	}
-	t = &Totals{
-		Budgeted: wp.TotalBudget(),
-		Planned:  p.Planned.FilterWP(name).Total(),
-		Done:     p.Timeline.FilterWP(name).Total(),
+	tot = &WPTotals{
+		Totals: Totals{
+			Budgeted: wp.TotalBudget(),
+			Planned:  p.Planned.FilterWP(name).Total(),
+			Done:     p.Timeline.FilterWP(name).Total(),
+		},
+		Tasks: make(map[string]*Totals),
+	}
+	for tn, t := range wp.Tasks {
+		tot.Tasks[tn] = &Totals{
+			Budgeted: t.Budget,
+			Planned:  p.Planned.FilterWPTask(name, tn).Total(),
+			Done:     p.Timeline.FilterWPTask(name, tn).Total(),
+		}
 	}
-	return t, nil
+	return tot, nil
 }
 
-func (p *Project) Totals() (t map[string]*Totals) {
-	t = make(map[string]*Totals)
+type AllTotals struct {
+	Totals
+	WP map[string]*WPTotals
+}
+
+func (p *Project) Totals() (at *AllTotals) {
+	at = &AllTotals{
+		// TODO: fill in totals here, too
+		WP: make(map[string]*WPTotals),
+	}
 	for n := range p.Workpackages {
-		t[n], _ = p.TotalWP(n)
+		at.WP[n], _ = p.TotalWP(n)
+	}
+	return at
+}
+
+func renderParallel(content ...[]string) []string {
+	maxh := 0
+	maxw := make([]int, len(content))
+
+	for i, c := range content {
+		h := len(c)
+		if maxh < h {
+			maxh = h
+		}
+		for _, l := range c {
+			w := len(l)
+			if maxw[i] < w {
+				maxw[i] = w
+			}
+		}
+	}
+	output := []string{}
+
+	for r := range maxh {
+		parts := []string{}
+		for c := range len(content) {
+			var snip string
+			if r < len(content[c]) {
+				snip = content[c][r]
+			}
+			parts = append(parts, fmt.Sprintf("%-[1]*s", maxw[c], snip))
+		}
+		output = append(output, strings.Join(parts, " | "))
+	}
+
+	return output
+}
+
+func (p *Project) ParallelWPTotals(tmpl ...string) ([]string, error) {
+	tm := "wp-total.t"
+	if len(tmpl) > 0 {
+		tm = tmpl[0]
+	}
+	if nil == templates.Lookup(tm) {
+		return nil, fmt.Errorf("template %q not found", tm)
+	}
+
+	totals := p.Totals()
+	content := [][]string{}
+	for name, wpt := range totals.WP {
+		buf := &bytes.Buffer{}
+		data := struct {
+			WP string
+			*WPTotals
+		}{name, wpt}
+		e := templates.ExecuteTemplate(buf, tm, data)
+		if e != nil {
+			return nil, fmt.Errorf("while rendering totals for %s with template %s: %w", name, tm, e)
+		}
+		content = append(content, strings.Split(buf.String(), "\n"))
 	}
-	return t
+	return renderParallel(content...), nil
 }
-- 
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