Added some tech-documentation.

README.technical-documentation.md

@@ -0,0 +1,75 @@
+### Options for cursestext
+
+NOTE: VERBOSE is only available for builds from the 'devel' branch
+
+In addition to `SCROLL_TEXT` and `SCROLL_LINE` variables, the submodule cursestext
+understands the variables `VERBOSE` and `SCROLL_BOX`.
+
+Setting `VERBOSE=1` will create a logfile: 'cursesscroller.log' in the
+current directory.
+
+Here is an example:
+
+    SCROLL_BOX=1 SCROLL_LINE=-1 VERBOSE=1 scrolltext cursestext
+
+The box is enabled by default.
+
+In order to not draw the box, you can switch it off by defining the variable
+`SCROLL_TEXT` with an empty value or 0, e.g. use
+
+    SCROLL_BOX= SCROLL_LINE=-1 scrolltext cursestext
+
+or
+
+    SCROLL_BOX=0 SCROLL_LINE=-1 scrolltext cursestext
+
+
+### Options for both interfaces
+
+You can select the line via `SCROLL_LINE` variable. Negative values are counting
+from bottom to top, e.g. the following selects the 2nd last line in the current
+terminal:
+
+    SCROLL_TEXT="Hello, world." SCROLL_LINE=-2 scrolltext
+
+
+### Using a different scrolling speed
+
+The scrolling speed can be altered by setting the environment variable `SCROLL_SPEED`
+There are 10 different speeds available. These can be selected by choosing a
+number between 0 and 9.
+
+Slow scrolling speed (default, if not set)
+
+    SCROLL_SPEED=0 scrolltext
+
+
+Fastest scrolling speed.
+
+    SCROLL_SPEED=10 scrolltext
+
+
+## Bugs and quirks
+
+ - attempts to detect term-resize, and clumsily adjusts some things
+ - documentation (even in this readme) is vague
+
+
+## Changes
+
+### v0.0.10
+
+ - added config option for color (only linescroller)
+
+### v0.0.9
+
+ - attempt to handle term resizes
+ - added config-option: endless  (see newly generated config-file)
+ - removed logging from main branch (you may find it on the devel branch)
+
+### v0.0.8
+
+ - doc-comments have never been generated, nor are those validated. (TODO)
+ - renamed log-file to "scrolltext.log"
+ - uses config file "scrolltextrc"
+   \*NIX uses "~/.config/scrolltextrc", windows uses "scrolltextrc" in current directory