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package config
import (
"bytes"
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
"text/template"
"git.sr.ht/~rjarry/aerc/lib/templates"
"github.com/go-ini/ini"
)
type ColumnFlags uint32
func (f ColumnFlags) Has(o ColumnFlags) bool { return f&o == o }
const (
ALIGN_LEFT ColumnFlags = 1 << iota
ALIGN_CENTER
ALIGN_RIGHT
WIDTH_AUTO // whatever is left
WIDTH_FRACTION // ratio of total width
WIDTH_EXACT // exact number of characters
WIDTH_FIT // fit to column content width
)
type ColumnDef struct {
Name string
Flags ColumnFlags
Width float64
Template *template.Template
}
var columnRe = regexp.MustCompile(`^([\w-]+)(?:([<:>])(=|\*|\d+%?)?)?$`)
func parseColumnDef(col string, section *ini.Section) (*ColumnDef, error) {
col = strings.TrimSpace(col)
match := columnRe.FindStringSubmatch(col)
if match == nil {
return nil, fmt.Errorf("invalid column def: %v", col)
}
name := match[1]
keyName := fmt.Sprintf("column-%s", name)
var flags ColumnFlags
switch match[2] {
case "<", "":
flags |= ALIGN_LEFT
case ":":
flags |= ALIGN_CENTER
case ">":
flags |= ALIGN_RIGHT
}
var width float64 = 0
switch match[3] {
case "=":
flags |= WIDTH_FIT
case "*", "":
flags |= WIDTH_AUTO
default:
s := match[3]
var divider float64 = 1
if strings.HasSuffix(s, "%") {
divider = 100
s = strings.TrimSuffix(s, "%")
flags |= WIDTH_FRACTION
} else {
flags |= WIDTH_EXACT
}
w, err := strconv.ParseFloat(s, 64)
if err != nil {
return nil, fmt.Errorf("%s: %w", keyName, err)
}
if divider == 100 && w > 100 {
return nil, fmt.Errorf("%s: invalid width %.0f%%", keyName, w)
}
width = w / divider
}
key, err := section.GetKey(keyName)
if err != nil {
return nil, err
}
t, err := templates.ParseTemplate(keyName, key.String())
if err != nil {
return nil, err
}
err = templates.Render(t, &bytes.Buffer{}, &dummyData{})
if err != nil {
return nil, err
}
return &ColumnDef{
Name: name,
Flags: flags,
Width: width,
Template: t,
}, nil
}
func ParseColumnDefs(key *ini.Key, section *ini.Section) ([]*ColumnDef, error) {
var columns []*ColumnDef
for _, col := range key.Strings(",") {
c, err := parseColumnDef(col, section)
if err != nil {
return nil, err
}
columns = append(columns, c)
}
if len(columns) == 0 {
return nil, fmt.Errorf("%s cannot be empty", key.Name())
}
return columns, nil
}
func ColumnDefsToIni(defs []*ColumnDef, keyName string) string {
var s strings.Builder
var cols []string
templates := make(map[string]string)
for _, def := range defs {
col := def.Name
switch {
case def.Flags.Has(ALIGN_LEFT):
col += "<"
case def.Flags.Has(ALIGN_CENTER):
col += ":"
case def.Flags.Has(ALIGN_RIGHT):
col += ">"
}
switch {
case def.Flags.Has(WIDTH_FIT):
col += "="
case def.Flags.Has(WIDTH_AUTO):
col += "*"
case def.Flags.Has(WIDTH_FRACTION):
col += fmt.Sprintf("%.0f%%", def.Width*100)
default:
col += fmt.Sprintf("%.0f", def.Width)
}
cols = append(cols, col)
tree := reflect.ValueOf(def.Template.Tree)
text := tree.Elem().FieldByName("text").String()
templates[fmt.Sprintf("column-%s", def.Name)] = text
}
s.WriteString(fmt.Sprintf("%s = %s\n", keyName, strings.Join(cols, ",")))
for name, text := range templates {
s.WriteString(fmt.Sprintf("%s = %s\n", name, text))
}
return s.String()
}
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