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Changelog range expansion change, expand docs

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Fabian Homborg 2018-06-25 17:57:06 +02:00
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CHANGELOG.md
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@ -16,6 +16,7 @@ This section is for changes merged to the `major` branch that are not also merge
- Successive commas in brace expansions are handled in less surprising manner (`{,,,}` expands to four empty strings rather than an empty string, a comma and an empty string again). (#3002, #4632).
- `%` is no longer used for process and job expansion. `$fish_pid` and `$last_pid` have taken the place of `%self` and `%last` respectively. (#4230, #1202)
- The new `math` builtin (see below) does not support logical expressions; `test` should be used instead (#4777).
- Range expansion (`$foo[1..5]`) will now always go forward if only the end is negative, and in reverse if just the start is. This is to enable clamping to the last valid index without changing direction if the list has fewer elements than expected.
## Notable fixes and improvements
- A new feature flags mechanism is added for staging deprecations and breaking changes. Feature flags may be specified at launch with `fish --features ...` or by setting the universal `fish_features` variable. (#4940)

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doc_src/index.hdr.in
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@ -631,7 +631,7 @@ Examples:
Both command substitution and shell variable expansion support accessing only specific items by providing a set of indices in square brackets. It's often needed to access a sequence of elements. To do this, use the range operator '`..`' for this. A range '`a..b`', where range limits 'a' and 'b' are integer numbers, is expanded into a sequence of indices '`a a+1 a+2 ... b`' or '`a a-1 a-2 ... b`' depending on which of 'a' or 'b' is higher. The negative range limits are calculated from the end of the array or command substitution. Note that invalid indexes for either end are silently clamped to one or the size of the array as appropriate.
Range expansion will go in reverse if the end element is earlier in the list than the start, unless exactly one of the given indices is negative. This is to enable clamping without changing direction if the list has fewer elements than expected.
Range expansion will go in reverse if the end element is earlier in the list than the start and forward if the end is later than the start, unless exactly one of the given indices is negative. This is to enable clamping without changing direction if the list has fewer elements than expected.
Some examples: