feat: .NET appsettings files in repos

appsettings.json and appsettings.<Environment>.json tracked by git are
listed under Repos, keys named as .NET names them (ConnectionStrings:Default).

- The secret patterns pick the keys, the rest hidden, with
  dotnet.secretPatterns for .NET files' own.
- An App Service Key Vault reference, @Microsoft.KeyVault(…), is marked
  as a reference; a BOM at the start is fine.
- A .NET icon, themeable with dotnetColor.

internal/ui/app/favourites.go

@@ -145,8 +145,8 @@ func (m Model) objectRender() func(styles.Styles, provider.Object, int) string {
 }
 
 // fileIcon is a repo file's icon, in its colour: a lock for an encrypted
-// one, a leaf for Spring config, a whale for compose, a file in the
-// warning colour for plain text; "" for other vaults, or without icons.
+// one, a leaf for Spring config, a whale for compose, .NET's for
+// appsettings, a file in the warning colour for plain text; "" for other vaults, or without icons.
 func (m Model) fileIcon(sty styles.Styles, c provider.Container) string {
 	if c.Source.Kind != provider.KindRepo {
 		return ""
@@ -157,6 +157,8 @@ func (m Model) fileIcon(sty styles.Styles, c provider.Container) string {
 		icon, style = m.icons.Spring, sty.Spring
 	case strings.HasPrefix(c.Detail, "compose"):
 		icon, style = m.icons.Compose, sty.Compose
+	case strings.HasPrefix(c.Detail, "dotnet"):
+		icon, style = m.icons.Dotnet, sty.Dotnet
 	case !strings.HasPrefix(c.Detail, "sops"):
 		icon, style = m.icons.PlainFile, sty.Warning
 	}

internal/ui/icons/icons.go

@@ -13,6 +13,7 @@ type Set struct {
 	PlainFile  string // a plain text secrets file (.env)
 	Spring     string // a Spring Boot config file
 	Compose    string // a Docker Compose file
+	Dotnet     string // a .NET appsettings file
 	Note       string // has a note (lazysecrets list)
 }
 
@@ -29,6 +30,7 @@ var NerdFont = Set{
 	PlainFile:  "\U000F0214", // md-file
 	Spring:     "\U000F032A", // md-leaf
 	Compose:    "\U000F0868", // md-docker
+	Dotnet:     "\U000F0AAE", // md-dot_net
 	Note:       "\U000F09ED",
 }
 

internal/ui/keys/keys.go

@@ -103,7 +103,7 @@ func (m *Map) Actions() []Action {
 		a(Lists, "prevTab", &m.PrevTab, "prev tab", "lists", "Previous tab of the focused pane: Sources and Favourites in Sources; Secrets, Keys, Certs in Secrets."),
 		a(Lists, "nextTab", &m.NextTab, "next tab", "lists", "Next tab of the focused pane."),
 		a(Lists, "sourcesView", &m.SourcesView, "grouped/flat sources", "lists", "Switch the Sources pane between grouped by provider and a flat list."),
-		a(Lists, "toggleHidden", &m.ToggleHidden, "show/hide hidden", "lists", "Show or hide what's hidden: Spring and compose keys that don't look like secrets, example files (.env.example), and files and repos with only those. Shown, they're dimmed; Go to finds them too."),
+		a(Lists, "toggleHidden", &m.ToggleHidden, "show/hide hidden", "lists", "Show or hide what's hidden: config file keys (Spring, compose, .NET) that don't look like secrets, example files (.env.example), and files and repos with only those. Shown, they're dimmed; Go to finds them too."),
 		a(Lists, "star", &m.Favourite, "star", "lists", "Star or unstar the selected subscription, vault or secret, for the account showing it. Starred items get a ★ and sort first."),
 		a(Lists, "goTo", &m.Search, "search", "lists", "Go to anything: search every vault and secret loaded and jump to one. Again in Go to: only the source or group you're in, and back to all. On the left, the scope: All, an account (or Databricks, or Repos), or one source (○ ◐ ● for how much of it is loaded)."),
 		a(Lists, "favourites", &m.Favourites, "favourites", "lists", "Go to, on Favourites: everything you've starred, to search and jump to."),

internal/ui/styles/styles.go

@@ -36,6 +36,7 @@ type Styles struct {
 	KindRepo       lipgloss.Style
 	Spring         lipgloss.Style // Spring Boot config files
 	Compose        lipgloss.Style // Docker Compose files
+	Dotnet         lipgloss.Style // .NET appsettings files
 
 	// themed marks the selection colours as set by the theme, so
 	// OnBackground leaves them.
@@ -74,6 +75,7 @@ func Default() Styles {
 		KindRepo:       lipgloss.NewStyle().Foreground(lipgloss.Magenta),
 		Spring:         lipgloss.NewStyle().Foreground(lipgloss.Green),
 		Compose:        lipgloss.NewStyle().Foreground(lipgloss.Blue),
+		Dotnet:         lipgloss.NewStyle().Foreground(lipgloss.BrightMagenta),
 	}
 }
 

internal/ui/styles/theme.go

@@ -44,6 +44,7 @@ var Roles = map[string]string{
 	"repoColor":                       "repos and their secret files (SOPS)",
 	"springColor":                     "Spring Boot config files",
 	"composeColor":                    "Docker Compose files",
+	"dotnetColor":                     ".NET appsettings files",
 }
 
 // FromTheme returns the default styles with the theme's roles applied, and
@@ -105,6 +106,8 @@ func FromTheme(theme map[string][]string) (Styles, color.Color, error) {
 			st.Spring = v.fg(lipgloss.NewStyle())
 		case "composeColor":
 			st.Compose = v.fg(lipgloss.NewStyle())
+		case "dotnetColor":
+			st.Dotnet = v.fg(lipgloss.NewStyle())
 		}
 	}
 	return st, fg, nil