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Diffstat (limited to 'Doc/Zsh')
| -rw-r--r-- | Doc/Zsh/mod_zutil.yo | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Doc/Zsh/mod_zutil.yo b/Doc/Zsh/mod_zutil.yo index e22197ea2..3dc4b25a6 100644 --- a/Doc/Zsh/mod_zutil.yo +++ b/Doc/Zsh/mod_zutil.yo @@ -124,6 +124,31 @@ many characters. After all `tt(%)' sequences for the given var(specs) have been processed, the resulting string is stored in the parameter var(param). +The tt(%)-escapes also understand ternary expressions in the form used by +prompts. The tt(%) is followed by a `tt(LPAR())' and then an ordinary +format specifier character as described above. There may be a set of +digits either before or after the `tt(LPAR())'; these specify a test +number, which defaults to zero. Negative numbers are also allowed. An +arbitrary delimiter character follows the format specifier, which is +followed by a piece of `true' text, the delimiter character again, a piece +of `false' text, and a closing parenthesis. The complete expression +(without the digits) thus looks like +`tt(%LPAR())var(X)tt(.)var(text1)tt(.)var(text2)tt(RPAR())', except that +the `tt(.)' character is arbitrary. The value given for the format +specifier in the var(char)tt(:)var(string) expressions is evaluated as a +mathematical expression, and compared with the test number. If they are +the same, var(text1) is output, else var(text2) is output. A parenthesis +may be escaped in var(text2) as tt(%RPAR()). Either of var(text1) or +var(text2) may contain nested tt(%)-escapes. + +For example: + +example(zformat -f REPLY "The answer is '%3(c.yes.no)'." c:3) + +outputs "The answer is 'yes'." to tt(REPLY) since the value for the format +specifier tt(c) is 3, agreeing with the digit argument to the ternary +expression. + The second form, using the tt(-a) option, can be used for aligning strings. Here, the var(specs) are of the form `var(left)tt(:)var(right)' where `var(left)' and `var(right)' are |