diff options
Diffstat (limited to 'lisp/eshell/esh-arg.el')
| -rw-r--r-- | lisp/eshell/esh-arg.el | 62 |
1 files changed, 53 insertions, 9 deletions
diff --git a/lisp/eshell/esh-arg.el b/lisp/eshell/esh-arg.el index 395aa87ff0e..459487f4358 100644 --- a/lisp/eshell/esh-arg.el +++ b/lisp/eshell/esh-arg.el @@ -180,19 +180,63 @@ treated as a literal character." (add-text-properties 0 (length string) '(escaped t) string)) string) +(defun eshell-concat (quoted &rest rest) + "Concatenate all the arguments in REST and return the result. +If QUOTED is nil, the resulting value(s) may be converted to +numbers (see `eshell-concat-1'). + +If each argument in REST is a non-list value, the result will be +a single value, as if (mapconcat #'eshell-stringify REST) had been +called, possibly converted to a number. + +If there is at least one (non-nil) list argument, the result will +be a list, with \"adjacent\" elements of consecutive arguments +concatenated as strings (again, possibly converted to numbers). +For example, concatenating \"a\", (\"b\"), and (\"c\" \"d\") +would produce (\"abc\" \"d\")." + (let (result) + (dolist (i rest result) + (when i + (cond + ((null result) + (setq result i)) + ((listp result) + (let (curr-head curr-tail) + (if (listp i) + (setq curr-head (car i) + curr-tail (cdr i)) + (setq curr-head i + curr-tail nil)) + (setq result + (append + (butlast result 1) + (list (eshell-concat-1 quoted (car (last result)) + curr-head)) + curr-tail)))) + ((listp i) + (setq result + (cons (eshell-concat-1 quoted result (car i)) + (cdr i)))) + (t + (setq result (eshell-concat-1 quoted result i)))))))) + +(defun eshell-concat-1 (quoted first second) + "Concatenate FIRST and SECOND. +If QUOTED is nil and either FIRST or SECOND are numbers, try to +convert the result to a number as well." + (let ((result (concat (eshell-stringify first) (eshell-stringify second)))) + (if (and (not quoted) + (or (numberp first) (numberp second))) + (eshell-convert-to-number result) + result))) + (defun eshell-resolve-current-argument () "If there are pending modifications to be made, make them now." (when eshell-current-argument (when eshell-arg-listified - (let ((parts eshell-current-argument)) - (while parts - (unless (stringp (car parts)) - (setcar parts - (list 'eshell-to-flat-string (car parts)))) - (setq parts (cdr parts))) - (setq eshell-current-argument - (list 'eshell-convert - (append (list 'concat) eshell-current-argument)))) + (setq eshell-current-argument + (append (list 'eshell-concat eshell-current-quoted) + eshell-current-argument)) (setq eshell-arg-listified nil)) (while eshell-current-modifiers (setq eshell-current-argument |