go(report): rework gen.go,report.tmpl

make report include `report_base.tex` file verbatim and save it in
`out/tex/report.tex` as a base file of the report.

currently, this is done when running `go generate ./report` but there
are plans to switch from that to emitting the file during runtime, as is
done with all other templates.

report/gen.go

@@ -7,64 +7,41 @@
 package main
 
 import (
+	_ "embed"
 	"log"
 	"os"
 	"text/template"
 	"time"
 )
 
+var (
+	//go:embed report_base.tex
+	reportBase []byte
+
+	//go:embed report.tmpl
+	tmplReportFile []byte
+)
+
 func main() {
-	// colAlign sets the alignment of latex table columns.
-	colAlign := []string{
-		"l",
-		"c",
-		"c",
-		"c",
-		"c",
-		"c",
-	}
-	results := []float64{
-		161.032187,
-		125.03484,
-		80321,
-		85.0362432,
-		-4.466,
-		66.0008,
-	}
-	colNames := []string{
-		"func name",
-		"min",
-		"max",
-		"mean",
-		"median",
-		"stdDev",
-	}
-
-	fName := "report.tex"
-	paths := []string{
-		"report.tmpl",
-	}
+	fName := "../out/tex/report.tex"
 	f, err := os.Create(fName)
-
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	defer f.Close()
 
-	reportTemplate := template.Must(template.ParseFiles(paths...))
+	tmplReport := template.New("report")
+	tmplReport = template.Must(tmplReport.Parse(string(tmplReportFile)))
 
-	err = reportTemplate.Execute(f, struct {
+	err = tmplReport.Execute(f, struct {
+		ReportBase string
 		Timestamp  time.Time
-		ColNames  []string
-		Results   []float64
-		ColAlign  []string
 	}{
+		ReportBase: string(reportBase),
 		Timestamp:  time.Now(),
-		ColNames:  colNames,
-		Results:   results,
-		ColAlign:  colAlign,
 	})
+
 	if err != nil {
 		log.Println(err)
 	}

report/report.tmpl

@@ -6,11 +6,6 @@
 % This file is a part of the math-optim project.
 % project homepage: https://git.dotya.ml/wanderer/math-optim/
 
-\begin{tabular}{ ||{{- range $i, $v := .ColAlign }}{{$v}}| {{- end}}| }
-  {{ range $i, $v := .ColNames }}{{$v }} & {{ end}}\\
-{{- range .Results }}
-  {{ printf "%f &" . }} \\
-{{- end }}
-\end{tabular}
+{{- .ReportBase -}}
 
-% vim: ft=gotexttmpl.tex ts=2 bs=2
+% vim: ft=gotexttmpl ts=2 bs=2 expandtab