Drop built in commands documentation

Most of the commands drafted there are no longer as they are described.
It's better to rewrite it.

1 files changed, 0 insertions, 107 deletions

diff --git a/docs/builtin_commands.md b/docs/builtin_commands.md
deleted file mode 100644
index 48f5a5b..0000000
--- a/docs/builtin_commands.md
+++ /dev/null
@@ -1,107 +0,0 @@
-Built-in commands
-=================
-Here is full list of all build in commands including its description and sometime
-usage examples. For more information see syntax documentation.
-
-All build in commands are defined in lover case as they are presented here, but
-also in upper case. Also you can change initial character, we use here default one
-(`$`).
-
-###	$include(PATH)
-Includes file content to its place. `PATH` is system path relative to current file
-folder or absolute path.
-
-With this command you can nest any other file content and this content. Note that
-because of evaluation principles, content can be evaluated multiple times. If it
-is not what you want, common idiom would be use:
-```
-$limit(0)$include(file)$endlimit
-```
-
-### $load(...)
-This loads additional modules. Geml searches with precedence for modules in file
-directory and in paths defined by environment variable `GEMLMODULES`. `NAME` is in
-such case relative path to module, but also absolute path can be used.
-
-Be aware that modules stays loaded even after current file preprocessing is
-finished. They are not unloaded automatically after return from include.
-
-For more information see module documentation.
-
-### $unload(...)
-Serves as opposite to `load` command. It is as it says unloading modules. But it
-is not paired with load.
-
-Without any argument `unload` will unload all loaded modules.
-
-### $limit(NUM)
-This command limits number of evaluation cycles for some text (see evaluation
-documentation).  After this command all text will be evaluated only `NUM` times.
-So `NUM` should be number. Passing empty string results in disabled evaluation
-until end of limit command. Default value if not limit command is used is `inf`,
-that means no limit.  Limit can be ended using `endlimit` command.
-
-Because of how limit works. Most likely you will use limit without any argument or
-with `inf`, or with `1`. Lets see once again what every one does. No argument is
-same as `0` so no evaluation is done until `endlimit` command. `inf` removes any
-limit and allows any number of nested evaluations. `1` specifies that evaluation
-should be done only once.
-
-You can nest limits together. This results to situation when content is evaluated
-limited times but some part of it that is wrapped in another limit block will be
-evaluated few times more without sucking up its root limit.
-
-### $endlimit
-This ends previous evaluation limit. Text after this command is not limited by
-that.
-
-### $"
-### $'
-This is almost same command as `$"`. It has same behavior as if you would write:
-```
-$"$limit $Text $endlimit$"
-```
-Where result would be:
-```
- $Text 
-```
-So its also limits evaluation.
-
-### $set(VAR,VALUE)
-### $define(VAR,...)
-### $enddefine
-### $undefine(VAR)
-### $math(EQ)
-### $if(COND)
-### $ifdef(VAR)
-### $ifndef(VAR)
-### $elif(COND)
-### $else
-### $endif
-### $for(VAR,COND,EQ)
-### $endfor
-### $while(COND)
-### $endwhile
-### $switch(VAR)
-### $case(VAL)
-### $default
-### $break
-### $continue
-### $exec(EXEC,...)
-Calls executable `EXEC` with rest of arguments as arguments for executed program.
-Standard output from this program is than included to same place as `exec`.
-
-### $shell(CMD)
-This is same as exec, except that instead of defining executable and command line
-arguments separately they are defined together in `CMD` argument. In fact you can
-specify any shell command in `CMD`.
-
-### $error(TEXT)
-`TEXT` is printed to error output and spg is terminated.
-
-### $warning(TEXT)
-`TEXT` is printed to error output, but geml continuous preprocessing text.
-
-### $info(TEXT)
-Simply prints `TEXT` to standard output. If standard output is used as output of
-result, info is printed to error output.