Libris Britannia 4/science library(b).zip/science library(b)/PROGRAMM/OTHER_LA/0289.ZIP/LIST.LST

File List | 1986-11-23 | 6KB | 123 lines

        *
        -PLUSOPS 1
        *
        *    LIST
        *       This is a Datapoint DOS-style LIST program.  It lists input files,
        *     either text or print files.  It can number output (default), or not.
        *     It generates page headings with page numbers.  Page length can be
        *     specified on the command line.  Tab characters can be expanded to
        *     any desired number of columns.  Output may either write a new or
        *     append to an existing file.  Default is to output to the printer PRN:.
        *    Parameter descriptions for LIST are described in the accompanying
        *     file UTILSDOC.TXT.
        *       The program was written in July 1986 by Gordon E. Peterson II,
        *     P.O. Box 40476, San Antonio, Texas  78229 (U.S.A.).  The program
        *     may be freely distributed.  If you find it to be useful, a five or
        *     ten dollar contribution sent to the author at the above address would
        *     be appreciated.  This will also make it possible to notify you of
        *     periodic improvements to this program;  and to let you know of
        *     some of the many other useful utilities also available.
        *
1             &FULLSCAN = &TRIM = 1
        *
2             SCREEN = "LIST 1.00  File Listing Utility" CHAR(13) CHAR(10)
2       +      "  Copyright 1986, Gordon E. Peterson II" CHAR(13) CHAR(10)
        *
        *  Next define some standard character sets and patterns we will use to
        *  scan off the file names and such on the command line, and to use for
        *  tab character expansion.
        *
3            ALPHNUM = (ALPHA = &UCASE &LCASE) (DECDIGS = "0123456789")
4            PATH_CHRS = (PATHCHRS2 = "!#$%&'()*^@_`~{}-" DECDIGS) "."
5           OB = (WHITE = SPAN(' ' CHAR(9))) | NULL
6            NAMEPAT = SPAN(ALPHA PATHCHRS2)
7           INTEGER = SPAN(DECDIGS)
8            FILENMP = NAMEPAT $ TEMPX *LE(SIZE(TEMPX),8)
9            FILEXTP2 = (NAMEPAT | NULL) $ TEMPX *LE(SIZE(TEMPX),3)
10          PATHP = (((ANY(ALPHA) ':') | NULL)
10      +     ARBNO((SPAN(ALPHA PATH_CHRS) | NULL) "\") SPAN(ALPHA PATH_CHRS)) |
10      +     (SPAN(ALPHNUM) ":")
11          OPTSEP = ANY(":=") | NULL
12            INFPAT = ";" OB PATHP $ FIN ((((OB "," OB) | WHITE)
12      +     (PATHP . FOUT)) | (NULL . FOUT))
13            RTCPAT = CHAR(9) @TCPOS
        *
        *  Program Main Code begins here.
        *     First, process the options.
        *
14            UPARM = REPLACE((&PARM ? ";" REM),&LCASE,&UCASE) " " :F(NOPT)
        *
        *  Get input file name & output file spec if any.
        *
15            UPARM INFPAT ANY("/ ")
16            SCREEN = IDENT(FIN) "No valid input file was specified." :S(END)
17            SCREEN = ~INPUT("INREC",1,150,FIN) "I cannot find input file "
17      +      FIN :S(END)
        *
        *  Check if we are supposed to write an output file.  If so, and if there
        *  was no output file spec given, we will default the file name to the same
        *  as the name of the input file.
        *
18            FOUT = ?(UPARM ? "/P") IDENT(FOUT) :F(NODEFONM)
19            FOUT = ((FIN ? "." FILEXTP2 RPOS(0) = ), FIN)
        *
        *  If an output file was specified but no extension, default the extension
        *  to .LST.
        *
20      NODEFONM  FOUT FILENMP RPOS(0) = FOUT ".LST"
21            &FULLSCAN = 0
        *
        *  The following six statements could be trivially reduced to a single
        *  statement but are being left separate for clarity.
        *
        *  Check if we are to suppress line numbers.  (SLNO = NULL if not)
        *
22            UPARM "/X" . SLNO
        *
        *  Check if number of blanks per tabulation has been specified.     Default to
        *  eight if not.
        *
23            NBT = 8
24            UPARM "/T" OPTSEP INTEGER . NBT
        *
        *  Check if number of lines per page has been specified.  Default to 55.
        *
25            NLP = 55
26            UPARM "/N" OPTSEP INTEGER . NLP
        *
        *  Check if we are listing an already-formatted file.  (IFAF = NULL if not)
        *
27            UPARM "/F" . IFAF
        *
        *  Check if appending to disk output file.  Also, if no output file has been
        *  specified, here is where we will default the output to the printer.  Open
        *  the output file and give an error message if we can't.  Exit in that case.
        *
28            SCREEN = ~OUTPUT("OUTREC",2,"W,131" ( ?(UPARM ? "/Q") ",E",NULL),
28      +      (FOUT = (DIFFER(FOUT) FOUT, "PRN:")))
28      +      "Sorry, I cannot open " FOUT " for output." :S(END)
        *
        *  Read an input line
        *
29      LOOP      LINE = INREC :F(END)
30             OUTREC = DIFFER(IFAF) LINE :S(LOOP)
        *
        *  Replace any tab characters with blanks as necessary.
        *
31      TXPLOOP LINE RTCPAT = DUPL(" ",NBT - REMDR(TCPOS - 1,NBT))
31      +      :S(TXPLOOP)
        *
        *  Output the line as requested.
        *
32             IDENT(LNO,0) :S(PAGEHDR)
33             IDENT(REMDR(LNO,NLP),0) :F(OUTIT)
34      PAGEHDR OUTREC = CHAR(12) CHAR(10) "Page " RPAD((PGNO = PGNO + 1),6)
34      +        DATE() "    " FIN DUPL(CHAR(10),2)
35      OUTIT      OUTREC = ?(LNO = LNO + 1) (IDENT(SLNO) LPAD(LNO,6) ". ", NULL)
35      +      LINE :(LOOP)
        *
        *  Error handling statements
        *
36      NOPT  SCREEN = "Options must follow the semicolon on the command line." :(END)
37      END