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June 10, 2013 18:48
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#!/bin/bash | |
shopt -s extglob nullglob | |
nc=0 | |
cron=0 | |
edit=0 | |
fullshebang=0 | |
lang=bash | |
user_editor=0 | |
editor= | |
toedit=() | |
names=() | |
# add a PATH assignment and export to the script, based on the curent PATH | |
# splits on colons so that the lines are truncated to 80 chars | |
add_path() { | |
local q=\' IFS=: cur=0 path len i elements | |
# split PATH (with escaped single quotes) into array on ":" | |
IFS=: read -ra path <<<"${PATH//$q/\\$q}" | |
elements=${#path[@]} | |
# iterate over array elements, adding the lengths until the line is too long | |
for ((i=0, len=0; i<=elements && len<=74; i++)); do | |
((len += ${#path[i]} + 1)) | |
done | |
((i--)) | |
# if a single element is too long, use it anyway | |
if ((cur < elements && cur == i)); then | |
((i++)) | |
fi | |
# print the assignment, with all of the elements up to "i" | |
printf "PATH='%s'\n" "${path[*]:cur:i-cur}" | |
# cur is the element at which the line becomes too long | |
cur=$i | |
# continue looping over the indices, doing the same, until PATH is exhausted | |
until ((cur >= elements)); do | |
for ((i=cur, len=0; len<=72 && i<=elements; i++)); do | |
((len += ${#path[i]} + 1)) | |
done | |
((i--)) | |
if ((cur < elements && cur == i)); then | |
((i++)) | |
fi | |
printf "PATH+=':%s'\n" "${path[*]:cur:i-cur}" | |
cur=$i | |
done | |
# print the export line | |
printf "%s\n\n" 'export PATH' | |
} | |
# usage: die MESSAGE | |
# print error and exit | |
die() { | |
printf '%s\n' "$@" >&2 | |
exit 1 | |
} | |
# usage: err MESSAGE | |
# print error, do not exit | |
err() { | |
printf '%s\n' "$@" >&2 | |
} | |
# usage: editor FILE ... | |
# exec editor (if user supplied), VISUAL, EDITOR, or "vi", in that order | |
editor() { | |
if ((user_editor)); then | |
exec $editor "$@" | |
elif [[ $VISUAL ]]; then | |
exec $VISUAL "$@" | |
else | |
exec ${EDITOR:-vi} "$@" | |
fi | |
} | |
# usage: get_names IS_NUL | |
# reads stdin, appending each name within to the targets array. if IS_NUL is | |
# unset or empty, reads one name per line. otherwise, reads NUL-delimited names | |
get_names() { | |
local cmd=(read -r) name | |
if [[ $1 ]]; then | |
cmd+=(-d '') | |
fi | |
while IFS= "${cmd[@]}" name; do | |
names+=("$name") | |
done | |
} | |
# usage: noclobber FILE | |
# adds '.N' to a filename, sans extension, until it doesn't exist | |
noclobber() { | |
local out=$1 i=0 | |
if [[ $1 = *+([^/]).*([^/]) ]]; then | |
local base=${1%.*} ext=${1##*.} | |
while [[ -e $out ]]; do | |
out=$base.$((++i)).$ext | |
done | |
else | |
while [[ -e $out ]]; do | |
out=$1.$((++i)) | |
done | |
fi | |
printf '%s\n' "$out" | |
} | |
# usage: usage | |
# ...heh | |
usage() { | |
cat <<'EOF' | |
newscript [OPTIONS] NAME [...] | |
Creates a new script for each NAME, in the current working directory | |
Options: | |
-h, --help display this help and exit | |
-l, --language LANG specify the language LANG, default is bash | |
-s, --shebang SHEBANG provide the entire shebang as an arg, SHEBANG | |
-c, --cron add a your current PATH to the beginning of the | |
script. only available with -l bash (default), or sh | |
-n, --no-clobber prepends a number to the end of each existing NAME | |
instead of erring | |
-e, --edit open created files in a text editor | |
-p, --editor PROG use PROG instead of the default editor. by default, | |
VISUAL, EDITOR, or vi will be used, in that order. | |
implies -e (--edit) | |
-t, --files-from FILE get a list of NAMEs from FILE, one per line (if NAMEs | |
are also provided, both will be used) | |
-T, --files-from0 FILE same as --files-from, but uses NUL-delimited NAMEs | |
Available languages for LANG are: | |
bash, sh, awk, sed, perl, python | |
EOF | |
} | |
# iterate over options breaking -ab into -a -b when needed and | |
# --foo=bar into --foo bar | |
optstring=hl:s:cnep:t:T: | |
unset options | |
while (($#)); do | |
case $1 in | |
# if option is of type -ab | |
-[!-]?*) | |
# loop over each character starting with the second | |
for ((i=1; i<${#1}; i++)); do | |
c=${1:i:1} | |
# add current char to options | |
options+=("-$c") | |
# if option takes a required argument, and it's not the last char | |
# make the rest of the string its argument | |
if [[ $optstring = *"$c:"* && ${1:i+1} ]]; then | |
options+=("${1:i+1}") | |
break | |
fi | |
done | |
;; | |
# if option is of type --foo=bar, split on first '=' | |
--?*=*) options+=("${1%%=*}" "${1#*=}");; | |
# end of options, stop breaking them up | |
--) | |
options+=(--endopts) | |
shift | |
options+=("$@") | |
break | |
;; | |
# otherwise, nothing special | |
*) options+=("$1");; | |
esac | |
shift | |
done | |
# set new positional parameters to altered options | |
set -- "${options[@]}" | |
unset options | |
# actually read the options and set stuff | |
while [[ $1 = -?* ]]; do | |
case $1 in | |
-h|--help) usage >&2; exit 0;; | |
-c|--cron) cron=1;; | |
-n|--no-clobber) nc=1;; | |
-l|--language) | |
[[ $2 ]] || die "LANG required for $1" | |
lang=$2 | |
shift | |
;; | |
-s|--shebang) | |
[[ $2 ]] || die "SHEBANG required for $1" | |
fullshebang=1 | |
shebang=$2 | |
shift | |
;; | |
-e|--edit) edit=1;; | |
-p|--editor) | |
[[ $2 ]] || die "PROG required for $1" | |
user_editor=1 | |
edit=1 | |
editor=$2 | |
;; | |
-t|--files-from) | |
[[ $2 ]] || die "FILE required for $1" | |
if [[ $2 = - ]]; then | |
get_names | |
elif [[ ! -f $2 || ! -r $2 ]]; then | |
die "$2 does not exist or is not readable" | |
else | |
get_names <"$2" | |
fi | |
shift | |
;; | |
-T|--files-from0) | |
[[ $2 ]] || die "FILE required for $1" | |
if [[ $2 = - ]]; then | |
get_names nul | |
elif [[ ! -f $2 || ! -r $2 ]]; then | |
die "$2 does not exist or is not readable" | |
else | |
get_names nul <"$2" | |
fi | |
shift | |
;; | |
--endopts) shift; break;; | |
*) die "invalid option: $1";; | |
esac | |
shift | |
done | |
# append remaining positional parameters to the names array | |
names+=("$@") | |
# if no names have been passed, either from the command line or if the | |
# --files-from file was empty, die | |
if ((!${#names[@]})); then | |
die "no targets specified" | |
fi | |
# if -s is used, check if the language is bash, sh, or perl, and set lang | |
if ((fullshebang)); then | |
case $shebang in | |
*/bash*([!/]) ) lang=bash;; | |
*/sh*([!/]) ) lang=sh;; | |
*/perl*([!/]) ) lang=perl;; | |
esac | |
# otherwise, validate lang and set the correct shebang | |
else | |
case $lang in | |
bash) shebang='#!/bin/bash';; | |
sh) shebang='#!/bin/sh';; | |
awk) shebang='#!/usr/bin/awk -f';; | |
sed) shebang='#!/usr/bin/sed -f';; | |
perl) shebang='#!/usr/bin/perl';; | |
python) shebang='#!/usr/bin/python';; | |
*) die "$lang is not an available preset language" | |
esac | |
fi | |
# make sure if cron is provided, language is bash or sh | |
if ((cron)) && [[ $lang != ?(ba)sh ]]; then | |
die "cron option is only available for bash or sh" | |
fi | |
# iterate over each target file | |
for file in "${names[@]}"; do | |
# if target exists | |
if [[ -e $file ]]; then | |
# if noclobber is on, set file to the new filename (with .N) | |
if ((nc)); then | |
file=$(noclobber "$file") | |
# otherwise, don't create the file, but try to add it to be edited for -e | |
else | |
err "$file already exists" | |
if [[ -f $file && -r $file ]]; then | |
toedit+=("$file") | |
fi | |
continue | |
fi | |
fi | |
# write the shebang, and possibly other stuff, to the new file | |
{ | |
printf '%s\n\n' "$shebang" | |
case $lang in | |
bash) | |
printf '%s\n\n' 'shopt -s extglob nullglob' | |
((cron)) && add_path | |
;; | |
sh) | |
((cron)) && add_path | |
;; | |
perl) | |
printf '%s\n%s\n\n' 'use warnings;' 'use strict;' | |
;; | |
esac | |
} > "$file" | |
# make file executable | |
chmod +x -- "$file" || err "error making $file executable" | |
# add file to list of files to edit | |
toedit+=("$file") | |
done | |
# if -e is used, open the file(s) in the preferred editor | |
if ((edit));then | |
editor "${toedit[@]}" | |
fi | |
# Copyright Daniel Mills <dm@e36freak.com> | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a copy | |
# of this software and associated documentation files (the "Software"), to | |
# deal in the Software without restriction, including without limitation the | |
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
# sell copies of the Software, and to permit persons to whom the Software is | |
# furnished to do so, subject to the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in | |
# all copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
# IN THE SOFTWARE. |
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