1 files changed, 128 insertions, 0 deletions
diff --git a/pkg/plot/t_gkidir.x b/pkg/plot/t_gkidir.x
new file mode 100644
index 00000000..dd9e8303
--- /dev/null
+++ b/pkg/plot/t_gkidir.x
@@ -0,0 +1,128 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<gki.h>
+
+define	I_OPCODE	Mems[$1+GKI_HDR_OPCODE-1]
+define	WS_MODE		Mems[$1+GKI_OPENWS_M - 1]
+define	SZ_TEXT		(5 * SZ_LINE)
+
+# T_GKIDIR -- print a directory of frames in the named GKI metacode files.
+
+procedure t_gkidir () 
+
+pointer	sp, mc_fname
+int	list, mfd
+int	clpopni(), open(), clgfil()
+
+begin
+	call smark (sp)
+	call salloc (mc_fname, SZ_FNAME, TY_CHAR)
+
+	list = clpopni ("input")
+	while (clgfil (list, Memc[mc_fname], SZ_FNAME) != EOF) {
+	    mfd = open (Memc[mc_fname], READ_ONLY, BINARY_FILE)
+	    call printf ("\nMETAFILE '%s':\n")
+		call pargstr (Memc[mc_fname])
+	    call gkd_read_metacode (mfd)
+	    call close (mfd)
+	}
+
+	call clpcls (list)
+	call sfree (sp)
+end
+
+
+# GKD_READ_METACODE -- reads through a metacode file, printing a directory of
+# the size and title of each frame in the file.
+
+procedure gkd_read_metacode (mf)
+
+int	mf	# Metacode file descriptor
+
+bool	new_frame
+char	tx_string[SZ_TEXT+1]
+pointer	gki
+int	nframe, length, mc_length, seek_text
+int	nchars, nchars_max, op_code
+int	gki_fetch_next_instruction()
+
+errchk	gki_fetch_next_instruction
+
+begin
+	nframe = 0
+	mc_length = 0
+	new_frame = false
+
+	repeat {
+	    length = gki_fetch_next_instruction (mf, gki)
+	    if (length == EOF)
+	        break
+
+	    op_code = I_OPCODE (gki)
+
+	    if ((op_code == GKI_OPENWS && WS_MODE(gki) == NEW_FILE) ||
+	    	(op_code == GKI_CLEAR)) {
+		# New frame encountered, marks end of previous frame.
+
+		if (new_frame) {
+		    # Last instruction was also a new frame.  Just bump length.
+		    mc_length = mc_length + length
+		    next
+		} else
+		    new_frame = true
+
+		if (nframe > 0)
+		    call gkd_print_directory (nframe, mc_length, tx_string)
+
+		nframe = nframe + 1
+		mc_length = length
+		nchars_max = 0
+		call strcpy ("(no title)", tx_string, SZ_LINE)
+		seek_text = YES
+
+	    } else {
+		new_frame = false
+	        mc_length = mc_length + length
+	    }
+
+	    if (op_code == GKI_MFTITLE) {
+		# No need to look at gtext commands any more - found a title.
+		seek_text = NO
+		nchars_max = min (int(Mems[gki+GKI_MFTITLE_N-1]), SZ_TEXT)
+		call achtsc (Mems[gki+GKI_MFTITLE_T-1], tx_string, nchars_max)
+		tx_string[nchars_max+1] = EOS
+	    }
+
+	    if (op_code == GKI_TEXT && seek_text == YES) {
+		# If this is longest string so far, save it as title.
+		nchars = Mems[gki + GKI_TEXT_N - 1]
+		if (nchars > nchars_max) {
+		    nchars_max = min (nchars, SZ_TEXT)
+		    call achtsc (Mems[gki+GKI_TEXT_T-1], tx_string, nchars_max)
+		    tx_string[nchars_max+1] = EOS
+		}
+	    }
+	}
+
+	# Print information from last frame in index, unless last frame is
+	# only a clear instruction.
+
+	if (mc_length > GKI_CLEAR_LEN)
+	    call gkd_print_directory (nframe, mc_length, tx_string)
+end
+
+
+# GKD_PRINT_DIRECTORY -- Print directory information of metacode frame.
+
+procedure gkd_print_directory (nframe, size, title)
+
+int	nframe 		# Frame number
+int	size 		# Length of metacode file
+char    title[ARB]	# Metacode title
+
+begin
+	call printf ("    [%d]  (%d words)  %26t%s\n")
+	    call pargi (nframe)
+	    call pargi (size)
+	    call pargstr (title)
+end