SYSTEM SUBROUTINES - APPENDIX C [Revelation On-Line Wiki]

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====== SYSTEM SUBROUTINES - APPENDIX C=====

^Published By^Date^Version^Knowledge Level^Keywords^
|Revelation Technologies|14 NOV 1989|2.X|EXPERT|Appendix|

==== Appendix 3 ====

=== The Status Line ===

The Advanced Revelation status line consists of 10 cells 
divided into upper and lower 
sections.  The upper section displays cells 1 to 3; the 
lower section, cells 7 to 10 (cell 10 is reserved for the 
system).  Each cell has a fixed length.
For Help level 2 in Advanced Revelation, cells 4-10 become a 
single cell containing Help 
information.  This cell is protected.

=== Advanced Revelation Status Line Layout ===


By convention, certain cells tend to be used for specific 
functions:


^Cell^Length^Conventional Usage^
|1|6|Name of current process (e.g. Paint).|
|2|6|Current function (e.g. Enter, Roam).|
|3|64|Dynamic information (program-specific).|
|4|6|Editor status.|
|5|6|(Varies).|
|6|11|(Usually Row indicator).|
|7|8|(Varies).|
|8|15|User name.|
|9|18|Updating Indexes indicator.|
|10|8|Level indicator.|

=== Adding New Status Lines ===

The SYS.TEXT_PARMS file contains templates for Advanced 
Revelation status lines.  A template must be added to this 
file for user-defined status lines.

To add a template, add a record in the SYS.TEXT_PARMS file 
with a key of status_linen*STATUS.  Where status_line is the 
name of your status line and n is the user Help level for 
the status line.  For Help level 0 status lines, do not 
specify n.

The status line record has the following format:

^Field^Description^
|<1>|Name of template (must be unique)|
|<2>|The data to display in a specific cell.  The values for individual cells are delimited by value marks.|
|<3>|Columnar formatting information for dynamic updates to cell 3. This field determines which column(s) within cell 3 are updated and the format of the update data. The specification must be an integer indicating the display column within cell 3 (1 is the first column in the cell), and two format values indicating the justification and length of display data (delimited by #).  The column and format data are delimited by a subvalue mark.  The justification and length format is:\\ just#n\\ where just may be L, R,or C and n is an integer.\\ \\ Multiple cell 3 column specifications are delimited by value marks (used by a MULTI.MODAL$ operation in STATUP).\\ The complete format is:\\ <column_n>just#length{@VM<column_n>just#length...}|

=== The STATUS.LIST Record ===

The STATUS.LIST record in the SYS.TEXT_PARMS file contains a 
list of status lines to be loaded at system initialization.  
Status lines that are not part of this list will be loaded 
as needed.

The system buffers as many status lines as are provided in 
STATUS.LIST.  If a status line is required that is not in 
memory, the least recently used status line is removed from 
memory to make room for the new status line.