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Add preview window option for setting the initial scroll offset

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Close #1057
Close #2120

  # Initial scroll offset is set to the line number of each line of
  # git grep output *minus* 5 lines
  git grep --line-number '' |
    fzf --delimiter : --preview 'nl {1}' --preview-window +{2}-5
This commit is contained in:
Junegunn Choi
2020-07-27 00:15:25 +09:00
parent c0a83b27eb
commit 0f9cb5590e
5 changed files with 97 additions and 17 deletions
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21
man/man1/fzf.1
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@@ -21,7 +21,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
..
.TH fzf 1 "Jun 2020" "fzf 0.22.0" "fzf - a command-line fuzzy finder"
.TH fzf 1 "Jul 2020" "fzf 0.22.0" "fzf - a command-line fuzzy finder"
.SH NAME
fzf - a command-line fuzzy finder
@@ -381,7 +381,7 @@ Preview window will be updated even when there is no match for the current
query if any of the placeholder expressions evaluates to a non-empty string.
.RE
.TP
.BI "--preview-window=" "[POSITION][:SIZE[%]][:noborder][:wrap][:hidden]"
.BI "--preview-window=" "[POSITION][:SIZE[%]][:noborder][:wrap][:hidden][:+SCROLL[-OFFSET]]"
Determines the layout of the preview window. If the argument contains
\fB:hidden\fR, the preview window will be hidden by default until
\fBtoggle-preview\fR action is triggered. Long lines are truncated by default.
@@ -390,6 +390,12 @@ Line wrap can be enabled with \fB:wrap\fR flag.
If size is given as 0, preview window will not be visible, but fzf will still
execute the command in the background.
\fB+SCROLL[-OFFSET]\fR determines the initial scroll offset of the preview
window. \fBSCROLL\fR can be either a numeric integer or a single-field index
expression that refers to a numeric integer. The optional \fB-OFFSET\fR part is
for adjusting the base offset so that you can see the text above it. It should
be given as a numeric integer.
.RS
.B POSITION: (default: right)
\fBup
@@ -400,8 +406,15 @@ execute the command in the background.
.RS
e.g.
\fBfzf --preview="head {}" --preview-window=up:30%
fzf --preview="file {}" --preview-window=down:1\fR
\fB# Non-default scroll window positions and sizes
fzf --preview="head {}" --preview-window=up:30%
fzf --preview="file {}" --preview-window=down:1
# Initial scroll offset is set to the line number of each line of
# git grep output *minus* 5 lines
git grep --line-number '' |
fzf --delimiter : --preview 'nl {1}' --preview-window +{2}-5\fR
.RE
.SS Scripting
.TP