config: add columns based index format

The index-format option comes from mutt and is neither user friendly,
nor intuitive. Introduce a new way of configuring the message list
contents. Replace index-format with multiple settings to make everything
more intuitive. Reuse the table widget added in the previous commit.

index-columns
	Comma-separated list of column names followed by optional
	alignment and width specifiers.

column-separator
	String separator between columns.

column-$name
	One setting for every name defined in index-columns. This
	supports golang text/template syntax and allows access to the
	same message information than before and much more.

When index-format is still defined in aerc.conf (which will most likely
happen when users will update after this patch), convert it to the new
index-columns + column-$name and column-separator system and a warning
is displayed on startup so that users are aware that they need to update
their config.

Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>
Tested-by: Bence Ferdinandy <bence@ferdinandy.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/config/columns.go b/config/columns.go
index 659be2c3..b1c7191b 100644
--- a/config/columns.go
+++ b/config/columns.go
@@ -3,6 +3,7 @@ package config
 import (
 	"bytes"
 	"fmt"
+	"reflect"
 	"regexp"
 	"strconv"
 	"strings"
@@ -118,3 +119,42 @@ func ParseColumnDefs(key *ini.Key, section *ini.Section) ([]*ColumnDef, error) {
 	}
 	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()
+}