Added GnuplotInternals submodule to distinguish private and public functions

src/GnuplotInternals.jl

@@ -0,0 +1,240 @@
+######################################################################
+# MODULE GnuplotInternals (private functions and definitions)
+######################################################################
+module _priv_
+
+importall Gnuplot
+const _pub_ = Gnuplot
+
+######################################################################
+# Structure definitions
+######################################################################
+
+"""
+Structure containing the `Pipe` and `Process` objects associated to a
+Gnuplot process.
+"""
+mutable struct GnuplotProc
+    pin::Base.Pipe
+    pout::Base.Pipe
+    perr::Base.Pipe
+    proc::Base.Process
+    channel::Channel{String}
+
+"""
+Start a new gnuplot process using the command given in the `cmd` argument.
+"""
+    function GnuplotProc(cmd::String)
+        this = new()
+        this.pin  = Base.Pipe()
+        this.pout = Base.Pipe()
+        this.perr = Base.Pipe()
+        this.channel = Channel{String}(32)
+
+        # Start gnuplot process
+        this.proc = spawn(`$cmd`, (this.pin, this.pout, this.perr))
+
+        # Close unused sides of the pipes
+        Base.close_pipe_sync(this.pout.in)
+        Base.close_pipe_sync(this.perr.in)
+        Base.close_pipe_sync(this.pin.out)
+        Base.start_reading(this.pout.out)
+        Base.start_reading(this.perr.out)
+
+        return this
+	end
+end
+
+
+#---------------------------------------------------------------------
+""" 
+Structure containing a single plot command and the associated
+multiplot index.
+"""
+mutable struct MultiCmd
+  cmd::String    # command
+  id::Int        # multiplot index
+end
+
+"""
+Structure containing the state of a single gnuplot session.
+"""
+mutable struct GnuplotState
+  blockCnt::Int           # data blocks counter
+  cmds::Vector{MultiCmd}  # gnuplot commands
+  data::Vector{String}    # data blocks
+  plot::Vector{MultiCmd}  # plot specifications associated to each data block
+  splot::Bool             # plot / splot session
+  lastDataName::String    # name of the last data block
+  multiID::Int            # current multiplot index (0 if no multiplot)
+
+  GnuplotState() = new(1, Vector{MultiCmd}(), Vector{String}(), Vector{MultiCmd}(), false, "", 0)
+end
+
+
+#---------------------------------------------------------------------
+"""
+Structure containing the global package state.
+"""
+mutable struct MainState
+  colorOut::Symbol              # gnuplot STDOUT is printed with this color
+  colorIn::Symbol               # gnuplot STDIN is printed with this color
+  verboseLev::Int               # verbosity level (0 - 3), default: 3
+  gnuplotCmd::String            # command used to start the gnuplot process
+  startup::String               # commands automatically sent to each new gnuplot process
+  procs::Vector{GnuplotProc}    # array of currently active gnuplot process and pipes
+  states::Vector{GnuplotState}  # array of gnuplot sessions
+  handles::Vector{Int}          # handles of gnuplot sessions
+  curPos::Int                   # index in the procs, states and handles array of current session
+
+  MainState() = new(:cyan, :yellow, 1,
+                    "", "",
+                    Vector{GnuplotProc}(), Vector{GnuplotState}(), Vector{Int}(),
+                    0)
+end
+
+
+######################################################################
+# Functions
+######################################################################
+
+"""
+Check gnuplot is runnable with the command given in `main.gnuplotCmd`.
+Also check that gnuplot version is >= 4.7 (required to use data
+blocks).
+"""
+function checkGnuplotVersion()
+    cmd = `$(main.gnuplotCmd) --version`
+    out, procs = open(`$cmd`, "r")
+    s = String(read(out))
+    if !success(procs)
+        error("An error occurred while running: " * string(cmd))
+    end
+
+    s = split(s, " ")
+    ver = ""
+    for token in s
+        try
+            ver = VersionNumber("$token")
+            break
+        catch
+        end
+    end
+
+    if ver < v"4.7"
+        error("gnuplot ver. >= 4.7 is required, but " * string(ver) * " was found.")
+    end
+    log(1, "Found gnuplot version: " * string(ver))
+    return ver
+end
+
+
+#---------------------------------------------------------------------
+"""
+Logging facility (each line is prefixed with the session handle.)
+
+Printing occur only if the logging level is >= current verbosity
+level.
+"""
+function log(level::Int, s::String; id=nothing, color=nothing)
+    if (main.verboseLev < level)
+        return
+    end
+
+    color == nothing  &&  (color = main.colorOut)
+
+    prefix = ""
+    if (id == nothing)  &&  (main.curPos > 0)
+        id = main.handles[main.curPos]
+    end
+    prefix = string("GP(", id, ")")
+
+    a = split(s, "\n")
+    for v in a
+        print_with_color(color, "$prefix $v\n")
+    end
+    return nothing
+end
+
+
+#---------------------------------------------------------------------
+"""
+Read gnuplot outputs, and optionally redirect to a `Channel`.
+
+This fuction is supposed to be run in a `Task`.
+"""
+function readTask(sIN, channel; kw...)
+    saveOutput::Bool = false
+    while isopen(sIN)
+        line = convert(String, readline(sIN))
+
+        if line == "GNUPLOT_JL_SAVE_OUTPUT"
+            saveOutput = true
+            log(4, "|start of captured data =========================")
+        else
+            if saveOutput
+                put!(channel, line)
+            end
+
+            if line == "GNUPLOT_JL_SAVE_OUTPUT_END"
+                saveOutput = false
+                log(4, "|end of captured data ===========================")
+            elseif line != ""
+                if saveOutput
+                    log(3, "|  " * line; kw...)
+                else
+                    log(2, "   " * line; kw...)
+                end
+            end
+        end
+    end
+
+    log(1, "pipe closed"; kw...)
+    return nothing
+end
+
+
+#---------------------------------------------------------------------
+"""
+Return a unique data block name
+"""
+function mkBlockName(;prefix::Union{Void,String}=nothing)
+    if prefix == nothing
+        prefix = string("d", _pub_.current())
+    end
+
+    cur = main.states[main.curPos]
+    name = string(prefix, "_", cur.blockCnt)
+    cur.blockCnt += 1
+
+    return name
+end
+
+
+#---------------------------------------------------------------------
+"""
+Return the GnuplotProc structure of current session, or start a new
+gnuplot process if none is running.
+"""
+function getProcOrStartIt()
+    if main.curPos == 0
+        log(1, "Starting a new gnuplot process...")
+        id = _pub_.session()
+    end
+
+    p = main.procs[main.curPos]
+
+    if !Base.process_running(p.proc)
+        error("The current gnuplot process is no longer running.")
+    end
+
+    return p
+end
+
+
+######################################################################
+# Module initialization
+######################################################################
+const main = MainState()
+
+end #module

test/runtests.jl

@@ -1,79 +1,80 @@
 using Base.Test
 using Gnuplot
+const gp = Gnuplot
 
 function pressEnter()
     println("Press enter...")
     readline(STDIN)
 end
 
-function gp_test(terminal="unknown")
+function gp_test(terminal="wxt")
-    gp_setOption(verb=1)
+    gp.setOption(verb=1)
-    gp_setOption(startup="set term $terminal")
+    gp.setOption(startup="set term $terminal")
 
-    gp_reset()
+    gp.reset()
     x = collect(1.:100)
 
     #-----------------------------------------------------------------
-    gp_send("plot sin(x)")
+    gp.send("plot sin(x)")
     terminal == "unknown"  ||  pressEnter()
 
     #-----------------------------------------------------------------
-    id1 = gp_current()
+    id1 = gp.current()
-    id2 = gp_new()
+    id2 = gp.session()
-    id3 = gp_new()
+    id3 = gp.session()
 
     for i in 1:10
-        gp_setCurrent(id1)
+        gp.setCurrent(id1)
-        gp_send("plot sin($i*x)")
+        gp.send("plot sin($i*x)")
 
-        gp_setCurrent(id2)
+        gp.setCurrent(id2)
-        gp_send("plot sin($i*x)")
+        gp.send("plot sin($i*x)")
 
-        gp_setCurrent(id3)
+        gp.setCurrent(id3)
-        gp_send("plot sin($i*x)")
+        gp.send("plot sin($i*x)")
 
         sleep(0.3)
     end
     terminal == "unknown"  ||  pressEnter()
-    gp_exitAll()
+    gp.exitAll()
 
     #-----------------------------------------------------------------
-    gp_reset()
+    gp.reset()
-    name = gp_data([1,2,3,5,8,13])
+    name = gp.data([1,2,3,5,8,13])
-    gp_plot("$name w points ps 3")
+    gp.plot("$name w points ps 3")
-    gp_dump()
+    gp.dump()
     terminal == "unknown"  ||  pressEnter()
 
-    gp_plot(last=true, "w l lw 3")
+    gp.plot(last=true, "w l lw 3")
-    gp_dump()
+    gp.dump()
     terminal == "unknown"  ||  pressEnter()
 
     #-----------------------------------------------------------------
-    gp_reset()
+    gp.reset()
 
-    gp_cmd("set format y \"%.1f\"")
+    gp.cmd("set format y \"%.1f\"")
-    gp_cmd("set key box opaque")
+    gp.cmd("set key box opaque")
-    gp_cmd("set xrange [-2*pi:2*pi]")
+    gp.cmd("set xrange [-2*pi:2*pi]")
-    gp_multi("layout 2,2 columnsfirst title \"Multiplot title\"")
+    gp.multi("layout 2,2 columnsfirst title \"Multiplot title\"")
 
-    gp_cmd(ylab="Y label")
+    gp.cmd(ylab="Y label")
-    gp_plot("sin(x) lt 1")
+    gp.plot("sin(x) lt 1")
 
-    gp_next()
+    gp.next()
-    gp_cmd(xlab="X label")
+    gp.cmd(xlab="X label")
-    gp_plot("cos(x) lt 2")
+    gp.plot("cos(x) lt 2")
 
-    gp_next()
+    gp.next()
-    gp_cmd("unset ylabel")
+    gp.cmd("unset ylabel")
-    gp_cmd("unset ytics")
+    gp.cmd("unset ytics")
-    gp_cmd("unset xlabel")
+    gp.cmd("unset xlabel")
-    gp_plot("sin(2*x) lt 3")
+    gp.plot("sin(2*x) lt 3")
 
-    gp_next()
+    gp.next()
-    gp_cmd(xlab="X label")
+    gp.cmd(xlab="X label")
-    gp_plot("cos(2*x) lt 4")
+    gp.plot("cos(2*x) lt 4")
 
-    gp_dump()
+    gp.dump()
     terminal == "unknown"  ||  pressEnter()
 
     #-----------------------------------------------------------------
@@ -98,16 +99,14 @@ function gp_test(terminal="unknown")
     terminal == "unknown"  ||  pressEnter()
 
     #-----------------------------------------------------------------
-    gp_reset()
+    @gpi(:reset, "set key off",
-    @gp_("set key off",
          xr=(1,10), yr=(1,100), xlog=true, ylog=true,
          :multi, "layout 2,2 columnsfirst title \"Multiplot title\"")
-
+    
     for i in 1:4
-        @gp_(x, x.^i, "w l lw 3 lt $i")
+        @gpi(x, x.^i, "w l lw 3 lt $i", :next)
-        @gp_(:next)
     end
-    gp_dump()
+    @gpi()
     terminal == "unknown"  ||  pressEnter()
 
     #-----------------------------------------------------------------
@@ -186,7 +185,7 @@ function gp_test(terminal="unknown")
 	    :plot, "x8, v, (u<0.5) ? -1 : sinc(x8,v) notitle",
 	    :plot, "x9, v, (u<0.5) ? -1 : sinc(x9,v) notitle")
 
-    gp_exitAll()
+    gp.exitAll()
     return true
 end