Fix #494 - _fzf_complete hangs on zsh when not using tmux pane

shell/completion.zsh

@@ -79,8 +79,15 @@ _fzf_dir_completion() {
     "" "/" ""
 }
 
+_fzf_feed_fifo() (
+  rm -f "$fifo"
+  mkfifo "$fifo"
+  cat <&0 > "$fifo" &
+)
+
 _fzf_complete() {
-  local fzf_opts lbuf fzf matches post
+  local fifo fzf_opts lbuf fzf matches post
+  fifo="${TMPDIR:-/tmp}/fzf-complete-fifo-$$"
   fzf_opts=$1
   lbuf=$2
   post="${funcstack[2]}_post"
@@ -88,11 +95,13 @@ _fzf_complete() {
 
   [ ${FZF_TMUX:-1} -eq 1 ] && fzf="fzf-tmux -d ${FZF_TMUX_HEIGHT:-40%}" || fzf="fzf"
 
-  matches=$(cat | ${=fzf} ${=FZF_COMPLETION_OPTS} ${=fzf_opts} -q "${(Q)prefix}" | $post | tr '\n' ' ')
+  _fzf_feed_fifo "$fifo"
+  matches=$(cat "$fifo" | ${=fzf} ${=FZF_COMPLETION_OPTS} ${=fzf_opts} -q "${(Q)prefix}" | $post | tr '\n' ' ')
   if [ -n "$matches" ]; then
     LBUFFER="$lbuf$matches"
   fi
   zle redisplay
+  rm -f "$fifo"
 }
 
 _fzf_complete_telnet() {

test/test_go.rb

@@ -1140,7 +1140,7 @@ class TestGoFZF < TestBase
 private
   def writelines path, lines
     File.unlink path while File.exists? path
-    File.open(path, 'w') { |f| f << lines.join($/) }
+    File.open(path, 'w') { |f| f << lines.join($/) + $/ }
   end
 end
 
@@ -1355,23 +1355,42 @@ module CompletionTest
       tmux.send_keys 'C-L'
       lines[-1] == "kill #{pid}"
     end
-
-    def test_custom_completion
-      tmux.send_keys '_fzf_compgen_path() { echo "\$1"; seq 10; }', :Enter
-      tmux.prepare
-      tmux.send_keys 'ls /tmp/**', :Tab, pane: 0
-      tmux.until(1) { |lines| lines.item_count == 11 }
-      tmux.send_keys :BTab, :BTab, :BTab
-      tmux.until(1) { |lines| lines[-2].include? '(3)' }
-      tmux.send_keys :Enter
-      tmux.until do |lines|
-        tmux.send_keys 'C-L'
-        lines[-1] == "ls /tmp 1 2"
-      end
-    end
   ensure
     Process.kill 'KILL', pid.to_i rescue nil if pid
   end
+
+  def test_custom_completion
+    tmux.send_keys '_fzf_compgen_path() { echo "\$1"; seq 10; }', :Enter
+    tmux.prepare
+    tmux.send_keys 'ls /tmp/**', :Tab, pane: 0
+    tmux.until(1) { |lines| lines.item_count == 11 }
+    tmux.send_keys :BTab, :BTab, :BTab
+    tmux.until(1) { |lines| lines[-2].include? '(3)' }
+    tmux.send_keys :Enter
+    tmux.until do |lines|
+      tmux.send_keys 'C-L'
+      lines[-1] == "ls /tmp 1 2"
+    end
+  end
+
+  def test_unset_completion
+    tmux.send_keys 'export FOO=BAR', :Enter
+    tmux.prepare
+
+    # Using tmux
+    tmux.send_keys 'unset FOO**', :Tab, pane: 0
+    tmux.until(1) { |lines| lines[-2].include? ' 1/' }
+    tmux.send_keys :Enter
+    tmux.until { |lines| lines[-1] == 'unset FOO' }
+    tmux.send_keys 'C-c'
+
+    # FZF_TMUX=0
+    new_shell
+    tmux.send_keys 'unset FOO**', :Tab
+    tmux.until { |lines| lines[-2].include? ' 1/' }
+    tmux.send_keys :Enter
+    tmux.until { |lines| lines[-1] == 'unset FOO' }
+  end
 end
 
 class TestBash < TestBase