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143 lines
3.0 KiB
143 lines
3.0 KiB
import attributes, dir from require 'lfs'
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import insert, concat from table
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unpack or=table.unpack
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-- min and max of table
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max= (t) ->
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m=t[1]
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for i=2, #t
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v=t[i]
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m=v if v>m
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m
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min= (t) ->
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m=t[1]
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for i=2, #t
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v=t[i]
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m=v if v<m
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m
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-- simpler constructs
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foreach= (tab, fn) ->
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[fn e for e in *tab]
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first= (tab, fn) ->
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for e in *tab
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return e if fn e
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exclude= (tab, ...) ->
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i=1
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while i<=#tab
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removed=false
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for j=1, select '#', ...
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if tab[i]==select j, ...
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table.remove tab, i
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removed=true
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break
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i+=1 unless removed
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tab
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flatten= (tab) ->
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return {tab} if (type tab)!='table'
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out={}
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for e in *tab
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if (type e)=='table' and e[1]
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insert out, v for v in *flatten e
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else
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insert out, e
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out
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-- file functions
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mtime= (f) ->
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a=attributes f
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a and a.modification
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exists= (f) ->
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(attributes f)!=nil
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-- command functions
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escapecmdpart= (p) ->
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if (type p)=='table'
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return p.raw if p.raw
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return concat [escapecmdpart part for part in *p], ' '
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return p if p\match '^[a-zA-Z0-9_./-]+$'
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'"'..p\gsub('\\', '\\\\')\gsub('"', '\\"')..'"'
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escapecmd= (c, args={}) ->
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c=escapecmdpart c
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c..=' '..escapecmdpart a for a in *args
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c
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run= (c, args, params={}) ->
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escaped=escapecmd c, args
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print escaped if params.print
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ret, _, code=os.execute escaped
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ret, code=ret==0, ret if (type ret)=='number'
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error "#{c} failed with code #{code}" if params.error and not ret
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ret, code
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popen= (c, args, mode='r', params={}) ->
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escaped=escapecmd c, args
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print escaped if params.print
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io.popen escaped, mode
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-- file matcher
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wildcard= (pattern) ->
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prefix, suffix=pattern\match '^(.*)%*%*(.*)$'
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if prefix
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fd=popen 'find', {(raw: '*'), '-name', "*#{suffix}"}
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found={}
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for line in fd\lines!
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insert found, line if (line\sub 1, #prefix)==prefix
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fd\close!
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return found
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directory, prefix, suffix=pattern\match '^(.*)/(.*)%*(.*)$'
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if directory
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found={}
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for file in dir directory
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if (file\sub 1, #prefix)==prefix and (file\sub -#suffix)==suffix
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insert found, "#{directory}/#{file}"
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return found
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prefix, suffix=pattern\match '^(.*)%*(.*)$'
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if prefix
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found={}
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for file in dir '.'
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if (file\sub 1, #prefix)==prefix and (file\sub -#suffix)==suffix
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insert found, file
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return found
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error "Invalid wildcard pattern: #{pattern}"
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-- string pattern
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patsubst= (str, pattern, replacement) ->
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return [patsubst s, pattern, replacement for s in *str] if (type str)=='table'
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prefix, suffix=pattern\match '^(.*)%%(.*)$'
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error "Invalid pattern #{pattern}" unless prefix
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reprefix, resuffix=replacement\match '^(.*)%%(.*)$'
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error "Invalid replacement pattern #{pattern}" unless reprefix
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if (str\sub 1, #prefix)==prefix and (str\sub -#suffix)==suffix
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return reprefix..(str\sub #prefix+1, -#suffix-1)..resuffix
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str
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env= (key, def) ->
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(os.getenv key) or def
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{
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-- table functions
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:min, :max
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:foreach
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:first
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:insert, :unpack, :concat
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:exclude
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:flatten
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-- file functions
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:wildcard
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:mtime, :exists
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-- command functions
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:run, :popen
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-- string functions
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:patsubst
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:env
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}
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