Added terminal(), terminals() and splash() functions

src/Gnuplot.jl

@@ -5,7 +5,7 @@ using StatsBase, ColorSchemes, ColorTypes, StructC14N, ReusePatterns
 import Base.reset
 import Base.write
 
-export @gp, @gsp, save, linestyles, palette, contourlines, hist
+export @gp, @gsp, save, linestyles, palette, contourlines, hist, terminal, terminals
 
 # ╭───────────────────────────────────────────────────────────────────╮
 # │                           TYPE DEFINITIONS                        │
@@ -61,6 +61,8 @@ const options = Options()
 # │                         LOW LEVEL FUNCTIONS                       │
 # ╰───────────────────────────────────────────────────────────────────╯
 
+version() = v"1.0-dev"
+
 # ---------------------------------------------------------------------
 """
   # gpversion
@@ -70,6 +72,7 @@ const options = Options()
   blocks).
 """
 function gpversion()
+    options.dry  &&  (return v"0.0.0")
     icmd = `$(options.cmd) --version`
 
     proc = open(`$icmd`, read=true)
@@ -282,7 +285,6 @@ end
 # ╰───────────────────────────────────────────────────────────────────╯
 # ---------------------------------------------------------------------
 function DrySession(sid::Symbol)
-    global options
     (sid in keys(sessions))  &&  error("Gnuplot session $sid is already active")
     out = DrySession(sid, Vector{DataSet}(), [SinglePlot()], 1)
     sessions[sid] = out
@@ -292,7 +294,6 @@ end
 # ---------------------------------------------------------------------
 function GPSession(sid::Symbol)
     function readTask(sid, stream, channel)
-        global options
         saveOutput = false
 
         while isopen(stream)
@@ -326,7 +327,6 @@ function GPSession(sid::Symbol)
         return nothing
     end
 
-    global options
 
     gpversion()
     session = DrySession(sid)
@@ -370,7 +370,6 @@ end
 
 # ---------------------------------------------------------------------
 function getsession(sid::Symbol=options.default)
-    global options
     if !(sid in keys(sessions))
         if options.dry
             DrySession(sid)
@@ -400,7 +399,6 @@ end
 """
 write(gp::DrySession, str::AbstractString) = nothing
 function write(gp::GPSession, str::AbstractString)
-    global options
     if options.verbose
         printstyled(color=:light_yellow, "GNUPLOT ($(gp.sid)) $str\n")
     end
@@ -436,7 +434,6 @@ end
 # ---------------------------------------------------------------------
 writeread(gp::DrySession, str::AbstractString) = [""]
 function writeread(gp::GPSession, str::AbstractString)
-    global options
     verbose = options.verbose
 
     options.verbose = false
@@ -517,7 +514,6 @@ end
 
 # ---------------------------------------------------------------------
 function quit(gp::DrySession)
-    global options
     delete!(sessions, gp.sid)
     return 0
 end
@@ -939,10 +935,7 @@ end
   Quit the session and the associated gnuplot process (if any).
 """
 function quit(sid::Symbol)
-    global options
-    if !(sid in keys(sessions))
-        error("Gnuplot session $sid do not exists")
-    end
+    (sid in keys(sessions))  ||  (return 0)
     return quit(sessions[sid])
 end
 
@@ -952,7 +945,6 @@ end
   Quit all the sessions and the associated gnuplot processes.
 """
 function quitall()
-    global options
     for sid in keys(sessions)
         quit(sid)
     end
@@ -994,11 +986,8 @@ function exec(gp::GPSession, command::String)
 
     return join(answer, "\n")
 end
-function exec(s::String)
-    global options
-    exec(getsession(), s)
-end
 exec(sid::Symbol, s::String) = exec(getsession(sid), s)
+exec(s::String) = exec(getsession(), s)
 
 
 # --------------------------------------------------------------------
@@ -1008,7 +997,6 @@ exec(sid::Symbol, s::String) = exec(getsession(sid), s)
 Set verbose flag to `true` or `false` (default: `false`).
 """
 function setverbose(b::Bool)
-    global options
     options.verbose = b
 end
 
@@ -1084,7 +1072,6 @@ end
 #     return nothing
 # end
 # function repl()
-#     global options
 #     return repl(options.default)
 # end
 
@@ -1301,4 +1288,43 @@ function histo2segments(in_x, counts)
     return (x, y)
 end
 
+
+# --------------------------------------------------------------------
+terminals() = split(exec("print GPVAL_TERMINALS"), " ")
+terminal() = exec("print GPVAL_TERM") * " " * exec("print GPVAL_TERMOPTIONS")
+
+# --------------------------------------------------------------------
+function splash(outputfile="")
+    quit(:splash)
+    gp = getsession(:splash)
+    if outputfile == ""
+        # Try to set a reasonably modern terminal.  Setting the size
+        # is necessary for the text to be properly sized.  The
+        # `noenhanced` option is required to display the "@" character
+        # (alternatively use "\\\\@", but it doesn't work on all
+        # terminals).
+        terms = terminals()
+        if "wxt" in terms
+            exec(gp, "set term wxt  noenhanced size 600,300")
+        elseif "qt" in terms
+            exec(gp, "set term qt   noenhanced size 600,300")
+        elseif "aqua" in terms
+            exec(gp, "set term aqua noenhanced size 600,300")
+        else
+            @warn "None of the `wxt`, `qt` and `aqua` terminals are available.  Output may look strange.."
+        end
+    else
+        exec(gp, "set term unknown")
+    end
+    @gp :- :splash "set margin 0"  "set border 0" "unset tics"
+    @gp :- :splash xr=[-0.3,1.7] yr=[-0.3,1.1]
+    @gp :- :splash "set origin 0,0" "set size 1,1"
+    @gp :- :splash "set label 1 at graph 1,1 right font 'Verdana,20' tc rgb '#4d64ae' ' Ver: " * string(version()) * "' "
+    @gp :- :splash "set arrow 1 from graph 0.05, 0.15 to graph 0.95, 0.15 size 0.2,20,60  noborder  lw 9 lc rgb '#4d64ae'"
+    @gp :- :splash "set arrow 2 from graph 0.15, 0.05 to graph 0.15, 0.95 size 0.2,20,60  noborder  lw 9 lc rgb '#4d64ae'"
+    @gp :- :splash ["0.35 0.65 @ 13253682'", "0.85 0.65 g 3774278", "1.3 0.65 p 9591203"] "w labels notit font 'Mono,160' tc rgb var"
+    (outputfile == "")  ||  save(:splash, term="pngcairo transparent noenhanced size 600,300", output=outputfile)
+    nothing
+end
+
 end #module