dt

duct tape for your unix pipes


dt 1.2.5 standard library

%( x y -- z ) Modulo two numeric values. In standard notation: a % b = c
*( x y -- z ) Multiply two numeric values.
+( x y -- z ) Add two numeric values.
-( x y -- z ) Subtract two numeric values. In standard notation: a - b = c
...( [...] -- ... ) Unpack a quote.
.s( -- ) Print the state of the process: all available values.
/( x y -- z ) Divide two numeric values. In standard notation: a / b = c
:( ... [name] -- ) Bind variables to a quote of names.
abs( x -- y ) Determine the absolute value of a number.
alias( prev new -- ) Alias a new command from another, copying the description of the previous command.
and( a b -- bool ) Determine if two values are both truthy.
any?( [...] predicate -- bool ) Determine whether any value in a quote passes a condition. Stops at the first truthy result.
anything?( -- bool ) True if any value is present.
appendf( contents filename -- ) Write a string to a file. If a file previously existed, the new content will be appended.
args( -- [arg] ) Produce the arguments provided to the process when it was launched.
assert-true( cond message -- ) Naive assertion that requires a condition to be truthy. If falsy, it will print a message to standard error and fail with an exit code of 1.
cd( dirname -- ) Change the process's working directory.
chars( string -- [substring] ) Splits a string into individual characters, where a character is a single byte. (Not friendly to UTF-8 runes.)
concat( [...] [...] -- [...] ) Concatenate two quotes. Values are coerced into quotes. (For String concatenation, see join.)
contains?( haystack needle -- bool ) With Strings, determine if a string contains a substring. With quotes, determine if a quote contains a value.
cwd( -- dirname ) Produce the current working directory.
def( action name -- ) Define a command.
def!( action name -- ) Defines a new command. If nested, any commands or variables defined will be available in the calling scope.
def-usage( name description -- ) Define the usage notes of a given command.
def?( name -- bool ) Determine whether a command is defined.
define( action description name -- ) Define a command with a description.
defs( -- [name] ) Produce a quote of all defined commands.
deq( [a...] -- a [...] ) Dequeue the first value from a quote.
divisor?( a b -- bool ) Determine if a number a is evenly divisible by number b.
do( ... action -- ... ) Execute an action.
do!( ... action -- ... ) Execute an action. If nested, any commands or variables defined will be available in the calling scope.
do!?( ... action condition -- ... ) Conditionally execute an action. If nested, any commands or variables defined will be available in the calling scope.
do?( ... action condition -- ... ) Conditionally execute an action.
doin( context action -- ) Execute an action in a context.
downcase( string -- lower ) Convert a string to its lowercase form.
drop( a -- ) Drop the most recent value.
dup( a -- a a ) Duplicate the most recent value.
each( [...] action -- ) Perform a given action with each value in a quote.
ends-with?( string suffix -- bool ) Determine if a string ends with a suffix.
enl( -- ) Print a newline to standard error.
enq( a [...] -- [a...] ) Enqueue a value into a quote as its new first value.
ep( a -- ) Print the most recent value to standard error.
epl( a -- ) Print the most recent value and a newline to standard error.
epls( [...] -- ) Print the values of the most recent quote, each followed by a newline, to standard error.
eprint( a -- ) Print the most recent value to standard error.
eprintln( a -- ) Print the most recent value and a newline to standard error.
eprintlns( [...] -- ) Print the values of the most recent quote, each followed by a newline, to standard error.
eq?( a b -- bool ) Determine if two values are equal. Works for most types with coercion.
evaleval
even?( a -- bool ) Determine if a number is even.
exec( process -- ) Execute a child process (from a String). When successful, returns stdout as a string. When unsuccessful, prints the child's stderr to stderr, and returns boolean false.
exit( exitcode -- ) Exit with the specified exit code.
filter( [...] predicate -- [...] ) Require some condition of all values in a quote. Truthy results are preserved, and falsy results are not.
first( [a...] -- a ) The first element of a quote.
green( -- ) Print a control character for green and bold (for the colorblind) to standard output and standard error.
gt?( x y -- bool ) Determine if a value is greater than another. In standard notation: a > b
gte?( x y -- bool ) Determine if a value is greater-than/equal-to another. In standard notation: a ≧ b
help( -- ) Print commands and their usage
inspire( -- wisdom ) Get inspiration.
interactive?( -- bool ) Determine if the input mode is interactive (a TTY) or not.
join( [substring] delim -- string ) Join strings with a delimiter.
last( [...a] -- a ) The last element of a quote.
len( [...] -- x ) The length of a string or quote. (Always 1 for single values.)
lines( string -- [substring] ) Splits a string on newlines.
loop( ... action -- ... ) Execute an action forever until it fails.
ls( -- [filename] ) Produce a quote of files and directories in the process's working directory.
lt?( x y -- bool ) Determine if a value is less than another. In standard notation: a < b
lte?( x y -- bool ) Determine if a value is less-than/equal-to another. In standard notation: a ≦ b
map( [...] command -- [...] ) Apply an action to all values in a quote.
nand( a b -- bool ) Determine if two values are not both truthy.
neq?( a b -- bool ) Determine if two values are unequal.
nl( -- ) Print a newline to standard output.
nor( a b -- bool ) Determine if neither of two values are truthy.
norm( -- ) Print a control character to reset any styling to standard output and standard error.
not( a -- bool ) Determine the inverse truthiness of a value.
odd?( a -- bool ) Determine if a number is odd.
or( a b -- bool ) Determine if either of two values are truthy.
p( a -- ) Print the most recent value to standard output.
parse-csv( string -- [[...]] ) Naive conversion of a raw string in comma-separated value (CSV) format to a quote of lines of cells
pl( a -- ) Print the most recent value and a newline to standard output.
pls( [...] -- ) Print the values of the most recent quote, each followed by a newline, to standard output.
pop( [...a] -- [...] a ) Pop the last value from a quote.
print( a -- ) Print the most recent value to standard output.
println( a -- ) Print the most recent value and a newline to standard output.
printlns( [...] -- ) Print the values of the most recent quote, each followed by a newline, to standard output.
procname( -- name ) Produce the name of the current process. This can be used, for example, to get the name of a shebang script.
push( [...] a -- [...a] ) Push a value into a quote as its new last value.
pwd( -- ) Print the current working directory to standard output.
quit( -- ) Quit. Prints a warning if there are any values left on stack.
quote( a -- [a] ) Quote a value.
quote-all( ... -- [...] ) Quote all current context.
rand( -- x ) Produces a random integer.
read-line( -- line ) Read a string from standard input until newline.
read-lines( -- [line] ) Read strings, separated by newlines, from standard input until EOF. (For example: until ctrl+d in a Unix-like system, or until a pipe is closed.)
readf( filename -- contents ) Read a file's contents as a string.
readln( -- line ) Read a string from standard input until newline.
readlns( -- [line] ) Read strings, separated by newlines, from standard input until EOF. (For example: until ctrl+d in a Unix-like system, or until a pipe is closed.)
red( -- ) Print a control character for red to standard output and standard error.
replrepl
rev( [...] -- [...] ) Reverse a quote or string. Other types are unmodified.
rl( -- line ) Read a string from standard input until newline.
rls( -- [line] ) Read strings, separated by newlines, from standard input until EOF. (For example: until ctrl+d in a Unix-like system, or until a pipe is closed.)
rot( a b c -- c a b ) Rotate the three most recent values.
shebang-argsshebang-args
sort( [...] -- [...] ) Sort a list of values. When values are of different type, they are sorted in the following order: bool, int, float, string, command, deferred command, quote.
split( string delim -- [substring] ) Split a string on all occurrences of a delimiter.
starts-with?( string prefix -- bool ) Determine if a string starts with a prefix.
status( -- ) Print the state of the process: all available values.
swap( a b -- b a ) Swap the two most recent values.
times( ... action n -- ... ) Perform a given action n times.
to-bool( a -- bool ) Coerce a value to a boolean.
to-cmd( a -- command ) Coerce a value to a command.
to-def( a -- deferred ) Coerce a value to a deferred command. (Read as "definition" or "deferred".)
to-float( a -- float ) Coerce a value to a floating-point number.
to-int( a -- int ) Coerce a value to an integer.
to-quote( a -- [...] ) Coerce value to a quote. To quote a quote, use quote.
to-string( a -- string ) Coerce a value to a string.
undef?( name -- bool ) Determine whether a command is undefined.
unlines( [substring] -- string ) Joins strings with newlines.
unquote( [...] -- ... ) Unpack a quote.
unwords( [substring] -- string ) Joins strings with spaces.
upcase( string -- upper ) Convert a string to its uppercase form.
usage( name -- description ) Print the usage notes of a given command.
version( -- version ) Produce the version of dt in use.
while( ... action cond -- ... ) Perform an action while the condition is truthy.
words( string -- [substring] ) Splits a string on spaces.
writef( contents filename -- ) Write a string as a file. If a file previously existed, it will be overwritten.