Added percol plugin

plugins/percol/README.md

@@ -0,0 +1,31 @@
+## percol
+
+**Maintainer:** [@robturtle](https://github.com/robturtle)
+
+It provides two functionalities that allow you search history and resume
+background jobs with interactively incremental searching utility powered by
+[Percol](https://github.com/mooz/percol).
+
+### Usage
+
+1. Use `Ctrl-R` to search the history.
+
+  ![interactively search history](https://www.dropbox.com/s/2ke80q5uswz7sqf/percol.plugin1.gif?raw=1)
+
+2. Use `Ctrl-Q` to resume background jobs.
+
+  ![interactively resume background jobs](https://www.dropbox.com/s/u5t5l7jeznv06y8/percol.plugin2.gif?raw=1)
+
+### Installation
+
+1. [Install percol](https://github.com/mooz/percol) from pip:
+
+  ```
+  pip install percol
+  ```
+
+2. Enable the plugin by adding it to your `plugins` definition in `~/.zshrc`:
+
+  ```
+  plugins=(percol)
+  ```

plugins/percol/percol.plugin.zsh

@@ -0,0 +1,38 @@
+#!/bin/zsh
+
+function exists {
+    which $1 &> /dev/null
+}
+
+if exists percol; then
+    ## Searching zsh history
+    function percol_select_history() {
+        local tac
+        exists gtac && tac="gtac" || { exists tac && tac="tac" || { tac="tail -r" } }
+        BUFFER=$(fc -l -n 1 | eval $tac | percol --query "$LBUFFER")
+        CURSOR=$#BUFFER         # move cursor
+        zle -R -c               # refresh
+    }
+    zle -N percol_select_history
+    bindkey '^R' percol_select_history
+
+    ## use `fg 1` just like under BASH, no need to type `fg %1`
+    fg() {
+        if [[ $# -eq 1 && $1 = - ]]; then
+            builtin fg %-
+        else
+            builtin fg %"$@"
+        fi
+    }
+
+    ## Interactively resume background jobs
+    function percol_resume_job {
+        ID=$(jobs | grep '\[\d\d*\]' | percol | sed -E 's/\[([0-9]+)\].*/\1/')
+        if [[ -n ${ID} ]]; then
+            fg ${ID}
+        fi
+        zle -R -c
+    }
+    zle -N percol_resume_job
+    bindkey '^Q' percol_resume_job
+fi