Returns the sum of the numbers val1 , val2 , …, val9 .

$(+, val1 [, val2, …, val9])

If the current thickness is set to 5, the following DIESEL string returns 15.

$(+, $(getvar, thickness), 10)

Returns the result of multiplying the numbers val1 , val2 , …, val9 .

$(*, val1 [, val2, …, val9])

If the numbers val1 and val2 are equal, the string returns 1; otherwise, it returns 0.

$(=, val1, val2)

If the number val1 is greater than val2 , the string returns 1; otherwise, it returns 0.

$(, val1, val2)

If the number val1 is less than or equal to val2 , the string returns 1; otherwise, it returns 0.

$(<=, val1, val2)

Returns the bitwise logical AND of the integers val1 through val9 .

$(and, val1 [, val2,…, val9])

Returns a formatted date and time based on a given picture.

$(edtime, time, picture)

Edits the Julian date given by time (obtained, for example, from $(getvar,date) according to the given picture ). The picture consists of format phrases replaced by specific representations of the date and time.
Characters not interpretable as format phrases are copied literally into the result
of $(edtime) . Format phrases are defined as shown in the following table.

For example, assume that the date and time are Saturday, 5 September 1998 4:53:17.506
the corresponding format phrases and output examples for edtime are as follows:

• D – 5
• DD – 05
• DDD – Sat
• DDDD – Saturday
• M – 9
• MO – 09
• MON – Sep
• MONTH – September
• YY – 98
• YYYY – 1998
• H – 4
• HH – 04
• MM – 53
• SS – 17
• MSEC – 506
• AM/PM – AM
• am/pm – am
• A/P – A
• a/p – a

Enter the entire AM/PM phrase as shown in the preceding table; if AM is used alone, the A will be read literally and the M will return the current month.

If any AM/PM phrases appear in the picture, the H and HH phrases edit the time according to the 12-hour civil clock (12:00-12:59 1:00-11:59)
instead of the 24-hour clock (00:00-23:59).

The following example uses the date and time from the preceding table. Notice that
the comma must be enclosed in quotation marks because it is read as an argument separator.

$(edtime, $(getvar,date), DDD"," DD MON YYYY - H:MMam/pm)

It returns the following:

Sat, 5 Sep 1998 – 4:53am

If time is 0, the time and date at the moment that the outermost macro was executed is used.
This avoids lengthy and time-consuming multiple calls on $(getvar,date) and guarantees that strings composed with multiple $(edtime) macros all use the same time.

Passes the string str to the DIESEL evaluator and returns the result of evaluating it.

$(eval, str)

Returns the value of the environment variable varname .

$(getenv, varname)

If no variable with that name is defined, it returns the null string.

Conditionally evaluates expressions.

$(if, expr, dotrue [, dofalse])

If expr is nonzero, it evaluates and returns dotrue . Otherwise, it evaluates and returns dofalse . Note that the branch not chosen by expr is not evaluated.

Evaluates and returns the argument selected by which .

$(nth, which, arg0 [, arg1,…, arg7])

If which is 0, nth returns arg0 , and so on. Note the difference between $(nth) and $(index) ; $(nth) returns one of a series of arguments to the function, while $(index) extracts a value from a comma-delimited string passed as a single argument. Arguments
not selected by which are not evaluated.

Returns the real value in the format and precision specified.

$(rtos, value [, mode, precision])

Edits the given value as a real number in the format specified by mode and precision. If mode and precision are omitted, it uses the current values selected with the UNITS command.

Returns the substring of string , starting at character start and extending for length characters.

$(substr, string, start [, length])

Characters in the string are numbered from 1. If length is omitted, it returns the entire remaining length of the string.

Returns the bitwise logical XOR of the integers val1 through val9 .

$(xor, val1 [, val2,…, val9])