Add -F to set-environment and source-file; GitHub issue 2359.

tmux.1

@@ -1407,7 +1407,7 @@ and
 .Fl T
 show debugging information about jobs and terminals.
 .It Xo Ic source-file
-.Op Fl nqv
+.Op Fl Fnqv
 .Ar path
 .Ar ...
 .Xc
@@ -1418,6 +1418,11 @@ Execute commands from one or more files specified by
 .Xr glob 7
 patterns).
 If
+.Fl F
+is present, then
+.Ar path
+is expanded as a format.
+If
 .Fl q
 is given, no error will be returned if
 .Ar path
@@ -5102,7 +5107,7 @@ section).
 Commands to alter and view the environment are:
 .Bl -tag -width Ds
 .It Xo Ic set-environment
-.Op Fl hgru
+.Op Fl Fhgru
 .Op Fl t Ar target-session
 .Ar name Op Ar value
 .Xc
@@ -5113,6 +5118,11 @@ If
 is used, the change is made in the global environment; otherwise, it is applied
 to the session environment for
 .Ar target-session .
+If
+.Fl F
+is present, then
+.Ar value
+is expanded as a format.
 The
 .Fl u
 flag unsets a variable.