Add statfmt option (#1288)

* Add `fileinfofmt` option

* echof is now unused

* Use different default for Windows

* Add new line to docs

* Indent placeholders description in documentation

* Change option name to `statfmt`

* Use plain text format for documentation

Author: joelim-work

complete.go

@@ -211,6 +211,7 @@ var (
 		"shellflag",
 		"shellopts",
 		"sortby",
+		"statfmt",
 		"timefmt",
 		"tempmarks",
 		"tagfmt",

doc.go

@@ -166,6 +166,7 @@ The following options can be used to customize the behavior of lf:
 	smartcase        bool      (default true)
 	smartdia         bool      (default false)
 	sortby           string    (default 'natural')
+	statfmt          string    (default "\033[36m%p\033[0m %c %u %g %s %t %L")
 	tabstop          int       (default 8)
 	tagfmt           string    (default "\033[31m")
 	tempmarks        string    (default '')
@@ -909,6 +910,12 @@ This option has no effect when 'ignoredia' is disabled.
 Sort type for directories.
 Currently supported sort types are 'natural', 'name', 'size', 'time', 'ctime', 'atime', and 'ext'.
 
+	statfmt    string    (default "\033[36m%p\033[0m %c %u %g %s %t %L")
+
+Format string of the file info shown in the bottom left corner.
+Special expansions are provided, '%p' as the file permissions, '%c' as the link count, '%u' as the user, '%g' as the group, '%s' as the file size, '%t' as the last modified time, and '%l' as the link target if it exists (otherwise a blank string). '%L' is the same as '%l' but with an arrow '-> ' prepended.
+On Windows, the link count, user and group fields are not supported and will be replaced with a blank string if specified. The default for Windows is "\033[36m%p\033[0m %s %t %L".
+
 	tabstop        int       (default 8)
 
 Number of space characters to show for horizontal tabulation (U+0009) character.

docstring.go

@@ -801,6 +801,8 @@ func (e *setExpr) eval(app *app, args []string) {
 		}
 		app.nav.sort()
 		app.ui.sort()
+	case "statfmt":
+		gOpts.statfmt = e.val
 	case "tabstop":
 		n, err := strconv.Atoi(e.val)
 		if err != nil {

eval.go

@@ -185,6 +185,7 @@ The following options can be used to customize the behavior of lf:
     smartcase        bool      (default true)
     smartdia         bool      (default false)
     sortby           string    (default 'natural')
+    statfmt          string    (default "\e033[36m%p\e033[0m %c %u %g %s %t %L")
     tabstop          int       (default 8)
     tagfmt           string    (default "\e033[31m")
     tempmarks        string    (default '')
@@ -1080,6 +1081,12 @@ Override 'ignoredia' option when the pattern contains a character with diacritic
 .PP
 Sort type for directories. Currently supported sort types are 'natural', 'name', 'size', 'time', 'ctime', 'atime', and 'ext'.
 .PP
+.EX
+    statfmt    string    (default "\e033[36m%p\e033[0m %c %u %g %s %t %L")
+.EE
+.PP
+Format string of the file info shown in the bottom left corner. Special expansions are provided, '%p' as the file permissions, '%c' as the link count, '%u' as the user, '%g' as the group, '%s' as the file size, '%t' as the last modified time, and '%l' as the link target if it exists (otherwise a blank string). '%L' is the same as '%l' but with an arrow '-> ' prepended. On Windows, the link count, user and group fields are not supported and will be replaced with a blank string if specified. The default for Windows is "\e033[36m%p\e033[0m %s %t %L".
+.PP
 .EX
     tabstop        int       (default 8)
 .EE

lf.1

@@ -67,6 +67,7 @@ var gOpts struct {
 	selmode          string
 	shell            string
 	shellflag        string
+	statfmt          string
 	timefmt          string
 	infotimefmtnew   string
 	infotimefmtold   string

opts.go

@@ -10,6 +10,7 @@ import (
 	"os/user"
 	"path/filepath"
 	"runtime"
+	"strconv"
 	"strings"
 	"syscall"
 
@@ -164,6 +165,8 @@ func setDefaults() {
 
 	gOpts.cmds["doc"] = &execExpr{"$", `"$lf" -doc | $PAGER`}
 	gOpts.keys["<f-1>"] = &callExpr{"doc", nil, 1}
+
+	gOpts.statfmt = "\033[36m%p\033[0m %c %u %g %s %t %L"
 }
 
 func setUserUmask() {
@@ -190,7 +193,7 @@ func isHidden(f os.FileInfo, path string, hiddenfiles []string) bool {
 func userName(f os.FileInfo) string {
 	if stat, ok := f.Sys().(*syscall.Stat_t); ok {
 		if u, err := user.LookupId(fmt.Sprint(stat.Uid)); err == nil {
-			return fmt.Sprintf("%v ", u.Username)
+			return u.Username
 		}
 	}
 	return ""
@@ -199,15 +202,15 @@ func userName(f os.FileInfo) string {
 func groupName(f os.FileInfo) string {
 	if stat, ok := f.Sys().(*syscall.Stat_t); ok {
 		if g, err := user.LookupGroupId(fmt.Sprint(stat.Gid)); err == nil {
-			return fmt.Sprintf("%v ", g.Name)
+			return g.Name
 		}
 	}
 	return ""
 }
 
 func linkCount(f os.FileInfo) string {
 	if stat, ok := f.Sys().(*syscall.Stat_t); ok {
-		return fmt.Sprintf("%v ", stat.Nlink)
+		return strconv.FormatUint(stat.Nlink, 10)
 	}
 	return ""
 }

os.go

@@ -123,6 +123,8 @@ func setDefaults() {
 
 	gOpts.cmds["doc"] = &execExpr{"!", "%lf% -doc | %PAGER%"}
 	gOpts.keys["<f-1>"] = &callExpr{"doc", nil, 1}
+
+	gOpts.statfmt = "\033[36m%p\033[0m %s %t %L"
 }
 
 func setUserUmask() {}

os_windows.go

@@ -648,10 +648,6 @@ func (ui *ui) echo(msg string) {
 	ui.msg = msg
 }
 
-func (ui *ui) echof(format string, a ...interface{}) {
-	ui.echo(fmt.Sprintf(format, a...))
-}
-
 func (ui *ui) echomsg(msg string) {
 	ui.msg = msg
 	log.Print(msg)
@@ -722,19 +718,21 @@ func (ui *ui) loadFileInfo(nav *nav) {
 		return
 	}
 
-	var linkTarget string
+	linkTargetArrow := ""
 	if curr.linkTarget != "" {
-		linkTarget = " -> " + curr.linkTarget
-	}
-
-	ui.echof("%v %v%v%v%4s %v%s",
-		curr.Mode(),
-		linkCount(curr), // optional
-		userName(curr),  // optional
-		groupName(curr), // optional
-		humanize(curr.Size()),
-		curr.ModTime().Format(gOpts.timefmt),
-		linkTarget)
+		linkTargetArrow = "-> " + curr.linkTarget
+	}
+
+	fileInfo := gOpts.statfmt
+	fileInfo = strings.Replace(fileInfo, "%p", curr.Mode().String(), -1)
+	fileInfo = strings.Replace(fileInfo, "%c", linkCount(curr), -1)
+	fileInfo = strings.Replace(fileInfo, "%u", userName(curr), -1)
+	fileInfo = strings.Replace(fileInfo, "%g", groupName(curr), -1)
+	fileInfo = strings.Replace(fileInfo, "%s", humanize(curr.Size()), -1)
+	fileInfo = strings.Replace(fileInfo, "%t", curr.ModTime().Format(gOpts.timefmt), -1)
+	fileInfo = strings.Replace(fileInfo, "%l", curr.linkTarget, -1)
+	fileInfo = strings.Replace(fileInfo, "%L", linkTargetArrow, -1)
+	ui.echo(fileInfo)
 }
 
 func (ui *ui) drawPromptLine(nav *nav) {