linux-kernel - [PATCH 6/7] perf completion: strip dependency on bash-completion

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Date:	Thu,  4 Jul 2013 18:11:30 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Namhyung Kim <namhyung.kim@....com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 6/7] perf completion: strip dependency on bash-completion

The bash-completion package defines the _get_comp_words_by_ref
function.  There is no need to depend on it, as we can reimplement it
like git.git has.

Cc: Namhyung Kim <namhyung.kim@....com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@...il.com>
---
 tools/perf/bash_completion | 83 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 77 insertions(+), 6 deletions(-)

diff --git a/tools/perf/bash_completion b/tools/perf/bash_completion
index 852d444..765fb2f 100644
--- a/tools/perf/bash_completion
+++ b/tools/perf/bash_completion
@@ -1,5 +1,81 @@
 # perf completion
 
+# Taken from git.git's completion script.
+__my_reassemble_comp_words_by_ref ()
+{
+	local exclude i j first
+	# Which word separators to exclude?
+	exclude="${1//[^$COMP_WORDBREAKS]}"
+	cword_=$COMP_CWORD
+	if [ -z "$exclude" ]; then
+		words_=("${COMP_WORDS[@]}")
+		return
+	fi
+	# List of word completion separators has shrunk;
+	# re-assemble words to complete.
+	for ((i=0, j=0; i < ${#COMP_WORDS[@]}; i++, j++)); do
+		# Append each nonempty word consisting of just
+		# word separator characters to the current word.
+		first=t
+		while
+			[ $i -gt 0 ] &&
+			[ -n "${COMP_WORDS[$i]}" ] &&
+			# word consists of excluded word separators
+			[ "${COMP_WORDS[$i]//[^$exclude]}" = "${COMP_WORDS[$i]}" ]
+		do
+			# Attach to the previous token,
+			# unless the previous token is the command name.
+			if [ $j -ge 2 ] && [ -n "$first" ]; then
+				((j--))
+			fi
+			first=
+			words_[$j]=${words_[j]}${COMP_WORDS[i]}
+			if [ $i = $COMP_CWORD ]; then
+				cword_=$j
+			fi
+			if (($i < ${#COMP_WORDS[@]} - 1)); then
+				((i++))
+			else
+				# Done.
+				return
+			fi
+		done
+		words_[$j]=${words_[j]}${COMP_WORDS[i]}
+		if [ $i = $COMP_CWORD ]; then
+			cword_=$j
+		fi
+	done
+}
+
+type _get_comp_words_by_ref &>/dev/null ||
+_get_comp_words_by_ref ()
+{
+	local exclude cur_ words_ cword_
+	if [ "$1" = "-n" ]; then
+		exclude=$2
+		shift 2
+	fi
+	__my_reassemble_comp_words_by_ref "$exclude"
+	cur_=${words_[cword_]}
+	while [ $# -gt 0 ]; do
+		case "$1" in
+		cur)
+			cur=$cur_
+			;;
+		prev)
+			prev=${words_[$cword_-1]}
+			;;
+		words)
+			words=("${words_[@]}")
+			;;
+		cword)
+			cword=$cword_
+			;;
+		esac
+		shift
+	done
+}
+
 type __ltrim_colon_completions &>/dev/null ||
 __ltrim_colon_completions ()
 {
@@ -19,12 +95,7 @@ _perf ()
 	local cur prev cmd
 
 	COMPREPLY=()
-	if function_exists _get_comp_words_by_ref; then
-		_get_comp_words_by_ref -n : cur prev
-	else
-		cur=$(_get_cword :)
-		prev=${COMP_WORDS[COMP_CWORD-1]}
-	fi
+	_get_comp_words_by_ref -n : cur prev
 
 	cmd=${COMP_WORDS[0]}
 
-- 
1.8.3.1.643.gebeea52.dirty

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