Add :next and :prev for cycling though grep results

rc/grep.kak

@@ -1,5 +1,6 @@
 decl str grepcmd 'grep -RHn'
 decl str toolsclient
+decl -hidden int _grep_current_line 0
 
 def -shell-params -file-completion \
     grep %{ %sh{
@@ -14,6 +15,7 @@ def -shell-params -file-completion \
      echo "eval -try-client '$kak_opt_toolsclient' %{
                edit! -fifo ${output} -scroll *grep*
                set buffer filetype grep
+               set buffer _grep_current_line 0
                hook buffer BufCloseFifo .* %{ nop %sh{ rm -r $(dirname ${output}) } }
            }"
 }}
@@ -21,6 +23,7 @@ def -shell-params -file-completion \
 hook global WinSetOption filetype=grep %{
     addhl group grep
     addhl -group grep regex "^([^:]+):(\d+):(\d+)?" 1:cyan 2:green 3:green
+    addhl -group grep line_option _grep_current_line default,blue
     hook buffer -group grep-hooks NormalKey <c-m> jump
 }
 
@@ -30,6 +33,23 @@ decl str jumpclient
 
 def jump %{
     exec 'xs^([^:]+):(\d+):(\d+)?<ret>'
+    set buffer _grep_current_line %val{cursor_line}
     eval -try-client %opt{jumpclient} edit %reg{1} %reg{2} %reg{3}
     try %{ focus %opt{jumpclient} }
 }
+
+def next -docstring 'Jump to next grep match' %{
+    eval -try-client %opt{jumpclient} %{
+        buffer '*grep*'
+        exec %rec{%opt{_grep_current_line}ggl/^[^:]+:\d+:<ret>}
+        jump
+    }
+}
+
+def prev -docstring 'Jump to previous grep match' %{
+    eval -try-client %opt{jumpclient} %{
+        buffer '*grep*'
+        exec %rec{%opt{_grep_current_line}g<a-/>^[^:]+:\d+:<ret>}
+        jump
+    }
+}