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[PATCH] fc: trim range instead of erroring out

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As I use/try/test many shells, I'm in the habit of using POSIX commands 
such as 'fc -l 1' to list the complete history.

If there have been more than $HISTSIZE command, the list is trimmed at 
the beginning without renumbering, and bash errors out:

$ fc -l 1
bash-5.0: fc: history specification out of range

This is different from every other shell, and also looks like it's 
contrary to the POSIX spec:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/fc.html#tag_20_44_05
| When a range of commands is used, it shall not be an error to specify
| first or last values that are not in the history list; fc shall
| substitute the value representing the oldest or newest command in the
| list, as appropriate. For example, if there are only ten commands in
| the history list, numbered 1 to 10:
|
| fc -l
| fc 1 99
|
| shall list and edit, respectively, all ten commands.

The attached patch removes the error and limits the range to available 
commands as specified.

- Martijn

-- 
||	modernish -- harness the shell
||	https://github.com/modernish/modernish
||
||	KornShell lives!
||	https://github.com/ksh93/ksh

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[PATCH] fc: trim range instead of erroring out Martijn Dekker <martijn@inlv.org> - 2020-08-11 16:59 +0100

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