add 'shellflag' option to customize shell flag

cc #597

complete.go

@@ -138,6 +138,7 @@ var (
 		"promptfmt",
 		"ratios",
 		"shell",
+		"shellflag",
 		"shellopts",
 		"sortby",
 		"timefmt",

doc.go

@@ -126,6 +126,7 @@ The following options can be used to customize the behavior of lf:
     reverse        bool      (default off)
     scrolloff      int       (default 0)
     shell          string    (default 'sh' for unix and 'cmd' for windows)
+    shellflag      string    (default '-c' for unix and '/c' for windows)
     shellopts      []string  (default '')
     smartcase      bool      (default on)
     smartdia       bool      (default off)
@@ -641,8 +642,11 @@ A smaller offset can be used when the current file is close to the beginning or
     shell          string    (default 'sh' for unix and 'cmd' for windows)
 
 Shell executable to use for shell commands.
-Shell commands are executed as 'shell shellopts -c command -- arguments'.
-On windows, '/c' is used instead of '-c' which should work in 'cmd' and 'powershell'.
+Shell commands are executed as 'shell shellopts shellflag command -- arguments'.
+
+    shellflag      string    (default '-c' for unix and '/c' for windows)
+
+Command line flag used to pass shell commands.
 
     shellopts      []string  (default '')
 

docstring.go

@@ -129,6 +129,7 @@ The following options can be used to customize the behavior of lf:
     reverse        bool      (default off)
     scrolloff      int       (default 0)
     shell          string    (default 'sh' for unix and 'cmd' for windows)
+    shellflag      string    (default '-c' for unix and '/c' for windows)
     shellopts      []string  (default '')
     smartcase      bool      (default on)
     smartdia       bool      (default off)
@@ -685,8 +686,11 @@ beginning or end of the list to show the maximum number of items.
     shell          string    (default 'sh' for unix and 'cmd' for windows)
 
 Shell executable to use for shell commands. Shell commands are executed as
-'shell shellopts -c command -- arguments'. On windows, '/c' is used instead
-of '-c' which should work in 'cmd' and 'powershell'.
+'shell shellopts shellflag command -- arguments'.
+
+    shellflag      string    (default '-c' for unix and '/c' for windows)
+
+Command line flag used to pass shell commands.
 
     shellopts      []string  (default '')
 

eval.go

@@ -309,6 +309,8 @@ func (e *setExpr) eval(app *app, args []string) {
 		app.ui.loadFile(app.nav, true)
 	case "shell":
 		gOpts.shell = e.val
+	case "shellflag":
+		gOpts.shellflag = e.val
 	case "shellopts":
 		if e.val == "" {
 			gOpts.shellopts = nil

lf.1

@@ -141,6 +141,7 @@ The following options can be used to customize the behavior of lf:
     reverse        bool      (default off)
     scrolloff      int       (default 0)
     shell          string    (default 'sh' for unix and 'cmd' for windows)
+    shellflag      string    (default '-c' for unix and '/c' for windows)
     shellopts      []string  (default '')
     smartcase      bool      (default on)
     smartdia       bool      (default off)
@@ -764,7 +765,13 @@ Minimum number of offset lines shown at all times in the top and the bottom of t
     shell          string    (default 'sh' for unix and 'cmd' for windows)
 .EE
 .PP
-Shell executable to use for shell commands. Shell commands are executed as 'shell shellopts -c command -- arguments'. On windows, '/c' is used instead of '-c' which should work in 'cmd' and 'powershell'.
+Shell executable to use for shell commands. Shell commands are executed as 'shell shellopts shellflag command -- arguments'.
+.PP
+.EX
+    shellflag      string    (default '-c' for unix and '/c' for windows)
+.EE
+.PP
+Command line flag used to pass shell commands.
 .PP
 .EX
     shellopts      []string  (default '')

opts.go

@@ -55,6 +55,7 @@ var gOpts struct {
 	cleaner        string
 	promptfmt      string
 	shell          string
+	shellflag      string
 	timefmt        string
 	truncatechar   string
 	ratios         []int
@@ -95,6 +96,7 @@ func init() {
 	gOpts.cleaner = ""
 	gOpts.promptfmt = "\033[32;1m%u@%h\033[0m:\033[34;1m%d\033[0m\033[1m%f\033[0m"
 	gOpts.shell = gDefaultShell
+	gOpts.shellflag = gDefaultShellFlag
 	gOpts.timefmt = time.ANSIC
 	gOpts.truncatechar = "~"
 	gOpts.ratios = []int{1, 2, 3}

os.go

@@ -23,6 +23,7 @@ var (
 
 var (
 	gDefaultShell      = "sh"
+	gDefaultShellFlag  = "-c"
 	gDefaultSocketProt = "unix"
 	gDefaultSocketPath string
 )
@@ -99,7 +100,7 @@ func shellCommand(s string, args []string) *exec.Cmd {
 		s = fmt.Sprintf("IFS='%s'; %s", gOpts.ifs, s)
 	}
 
-	args = append([]string{"-c", s, "--"}, args...)
+	args = append([]string{gOpts.shellflag, s, "--"}, args...)
 
 	args = append(gOpts.shellopts, args...)
 

os_windows.go

@@ -22,6 +22,7 @@ var envPathExt = os.Getenv("PATHEXT")
 
 var (
 	gDefaultShell      = "cmd"
+	gDefaultShellFlag  = "/c"
 	gDefaultSocketProt = "tcp"
 	gDefaultSocketPath = "127.0.0.1:12345"
 )
@@ -77,7 +78,7 @@ func detachedCommand(name string, arg ...string) *exec.Cmd {
 }
 
 func shellCommand(s string, args []string) *exec.Cmd {
-	args = append([]string{"/c", s}, args...)
+	args = append([]string{gOpts.shellflag, s}, args...)
 
 	args = append(gOpts.shellopts, args...)