Tickets :: Comment on [#21] Combining VMS and Unix-style paths

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Comment	> The two paths are explained in > :help after-directory > > --------------- > The problem seems to be the difference between so-called "rooted" and > "unrooted" > logical names; it seems that vms_unix_mixed_filespec() does not > recognise this > difference currently. > > An unrooted logical name: ulog:foo.txt (sys$login:foo.txt) > A rooted logical name: rlog:[bar.baz]foo.txt > > A rooted logical is a bit like a logical device; it can be followed by a > directory path in brackets ([bar.baz] or <bar.baz>). An unrooted > logical is NOT > followed by a directory path. Furthermore, it can have multiple > translations (as > described in Ticket #10). > > --------------- > The path SYS$LOGIN:VIMFILES/AFTER uses an unrooted logical. However, > vms_unix_mixed_filespec() translates it to > > SYS$LOGIN:[.VIMFILES]AFTER > > This is wrong, because this path appears to contain a rooted logical. > > Then, decc$translate_vms() fills in the default values (based on the default > directory). So, given that my default directory is > > $ show default > MYDEVICE:[A.B.C.D] > > decc$translate_vms() translates this to > > /sys$login/a/b/c/d/vimfiles/after > > which is wrong (very different from the intention of > SYS$LOGIN:VIMFILES/AFTER). > > --------------- > I think the solution is that vms_unix_mixed_filespec() does the following: > > 1) extract the portion of the path up to the last colon (:) or closing > bracket (] or >) literally (i.e. do not translate the [bar.baz] to > bar/baz yet > 2) let decc$translate_vms() turn this into a Unix path > 3) then append the rest of the path (left after point 1) > 4) let decc$to_vms() turn it into a VMS path again > > (5) put in a comment somewhere, making the assumption (which is > already being > made) that a "mixed unix-vms file specification" means it > starts as VMS > and ends as Unix (i.e. it cannot start Unix-style and end VMS style). > > Obviously, this will make vms_unix_mixed_filespec() much "bigger", possibly > slower. However, I think that vms_unix_mixed_filespec() is NOT able to handle > this correctly, without the help of the decc$...() functions. In > particular, it > cannot know what the decc$...() functions know - the distinction > between rooted > and unrooted logicals, the defaults (of the default directory) etc. > > Consider all these cases that must be handled correctly: > > A) sys$login:vimfiles/after > B) rooted_log:[a.b.c.d]vimfiles/after > C) set def [a.b.c.d] > rooted_log:vimfiles/after (should give the same result as B) > > The solution proposed above solves this, while the current solution fails in > point A. >
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