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zsh/.oh-my-zsh/plugins/man/man.plugin.zsh

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+# ------------------------------------------------------------------------------
+# Author
+# ------
+#
+# * Jerry Ling<jerryling315@gmail.com>
+#
+# ------------------------------------------------------------------------------
+# Usage
+# -----
+#
+# man will be inserted before the command
+#
+# ------------------------------------------------------------------------------
+
+man-command-line() {
+    # if there is no command typed, use the last command
+    [[ -z "$BUFFER" ]] && zle up-history
+
+    # if typed command begins with man, do nothing
+    [[ "$BUFFER" = man\ * ]] && return
+
+    # get command and possible subcommand
+    # http://zsh.sourceforge.net/Doc/Release/Expansion.html#Parameter-Expansion-Flags
+    local -a args
+    args=(${${(Az)BUFFER}[1]} ${${(Az)BUFFER}[2]})
+
+    # check if man page exists for command and first argument
+    if man "${args[1]}-${args[2]}" >/dev/null 2>&1; then
+        BUFFER="man $args"
+    else
+        BUFFER="man ${args[1]}"
+    fi
+}
+
+zle -N man-command-line
+# Defined shortcut keys: [Esc]man
+bindkey "\e"man man-command-line