statusline: Provide overwrite mode indicator

Author: JoeKar

internal/config/settings.go

@@ -93,7 +93,7 @@ var defaultCommonSettings = map[string]interface{}{
 	"softwrap":        false,
 	"splitbottom":     true,
 	"splitright":      true,
-	"statusformatl":   "$(filename) $(modified)($(line),$(col)) $(status.paste)| ft:$(opt:filetype) | $(opt:fileformat) | $(opt:encoding)",
+	"statusformatl":   "$(filename) $(modified)$(overwrite)($(line),$(col)) $(status.paste)| ft:$(opt:filetype) | $(opt:fileformat) | $(opt:encoding)",
 	"statusformatr":   "$(bind:ToggleKeyMenu): bindings, $(bind:ToggleHelp): help",
 	"statusline":      true,
 	"syntax":          true,

internal/display/statusline.go

@@ -47,6 +47,12 @@ var statusInfo = map[string]func(*buffer.Buffer) string{
 		}
 		return ""
 	},
+	"overwrite": func(b *buffer.Buffer) string {
+		if b.OverwriteMode && !b.Type.Readonly {
+			return "[ovwr] "
+		}
+		return ""
+	},
 	"lines": func(b *buffer.Buffer) string {
 		return strconv.Itoa(b.LinesNum())
 	},

runtime/help/options.md

@@ -415,11 +415,11 @@ Here are the available options:
 * `statusformatl`: format string definition for the left-justified part of the
    statusline. Special directives should be placed inside `$()`. Special
    directives include: `filename`, `modified`, `line`, `col`, `lines`,
-   `percentage`, `opt`, `bind`.
+   `percentage`, `opt`, `overwrite`, `bind`.
    The `opt` and `bind` directives take either an option or an action afterward
    and fill in the value of the option or the key bound to the action.
 
-    default value: `$(filename) $(modified)($(line),$(col)) $(status.paste)|
+    default value: `$(filename) $(modified)$(overwrite)($(line),$(col)) $(status.paste)|
                     ft:$(opt:filetype) | $(opt:fileformat) | $(opt:encoding)`
 
 * `statusformatr`: format string definition for the right-justified part of the
@@ -578,7 +578,7 @@ so that you can see what the formatting should look like.
     "splitbottom": true,
     "splitright": true,
     "status": true,
-    "statusformatl": "$(filename) $(modified)($(line),$(col)) $(status.paste)| ft:$(opt:filetype) | $(opt:fileformat) | $(opt:encoding)",
+    "statusformatl": "$(filename) $(modified)$(overwrite)($(line),$(col)) $(status.paste)| ft:$(opt:filetype) | $(opt:fileformat) | $(opt:encoding)",
     "statusformatr": "$(bind:ToggleKeyMenu): bindings, $(bind:ToggleHelp): help",
     "statusline": true,
     "sucmd": "sudo",