CODEWITHSUNDEEP
bash
Matt - sanemat
Matt - sanemat

Reputation: 5618

Bash alias and bash function with several arguments

I want to use both bash alias and bash function with several arguments. I emulate svn sub commands.

$ svngrep -nr 'Foo' .
$ svn grep -nr 'Foo' .

My expectation is both act as below:

grep --exclude='*.svn-*' --exclude='entries' -nr 'Foo' .

But actual, only alias ('svngrep') does well, function ('svn grep') causes invalid option error. How to write my .bashrc?

#~/.bashrc

alias svngrep="grep --exclude='*.svn-*' --exclude='entries'"

svn() {
  if [[ $1 == grep ]]
then
  local remains=$(echo $@ | sed -e 's/grep//')
  command "$svngrep $remains"
else
  command svn "$@"
fi
}

Upvotes: 0

Views: 1786

Answers (3)

Matt - sanemat
Matt - sanemat

Reputation: 5618

I re-factor this by myself. And work fine! Thanks! 

#~/.bashrc
alias svngrep="svn grep"
svn() {
if [[ $1 == grep ]]
then
    local remains=$(echo $* | sed -e 's/grep//')
    command grep --exclude='*.svn-*' --exclude='entries' $remains
else
  command svn $*
fi
}

I choice I keep alias simple. And I use $* instead of $@.

Edited: 2012-06-11

#~/.bashrc
alias svngrep="svn grep"
svn() {
  if [[ $1 = grep ]]
  then
    shift
    command grep --exclude='*.svn-*' --exclude='entries' "$@"
  else
    command svn "$@"
  fi
}

Upvotes: 0

glenn jackman
glenn jackman

Reputation: 246774

You want shift to remove the first word from the positional parameters: this preserves the array-like nature of "$@".

svn() {
  if [[ $1 = grep ]]; then
    shift
    svngrep "$@"
  else
    command svn "$@"
  fi
}

With bash's [[ builtin, single = is used for string equality and double == is used for pattern matching -- you only need the former in this case.

Upvotes: 2

Fatih Arslan
Fatih Arslan

Reputation: 17117

svngrep is not a variable. It's an alias used by bash. Therefore have to create a new variable like:

svngrep_var="grep --exclude='*.svn-*' --exclude='entries'"

And use it in your snippet:

...
command "$svngrep_var $remains"
...

Upvotes: 0

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