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Aaron Gutierrez
2015-03-29 18:22:30 -04:00
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" Pathname manipulation functions.
"
" Author: Peter Odding <peter@peterodding.com>
" Last Change: July 7, 2014
" URL: http://peterodding.com/code/vim/misc/
let s:windows_compatible = xolox#misc#os#is_win()
function! xolox#misc#path#which(...) " {{{1
" Scan the executable search path (`$PATH`) for one or more external
" programs. Expects one or more string arguments with program names. Returns
" a list with the absolute pathnames of all found programs. Here's an
" example:
"
" :echo xolox#misc#path#which('gvim', 'vim')
" ['/usr/local/bin/gvim',
" '/usr/bin/gvim',
" '/usr/local/bin/vim',
" '/usr/bin/vim']
let extensions = s:windows_compatible ? split($PATHEXT, ';') : ['']
let matches = []
let checked = {}
for program in a:000
for directory in split($PATH, s:windows_compatible ? ';' : ':')
let directory = xolox#misc#path#absolute(directory)
if isdirectory(directory)
let found = 0
for extension in extensions
let path = xolox#misc#path#merge(directory, program . extension)
if executable(path)
call add(matches, path)
let found = 1
endif
endfor
if s:windows_compatible && ! found
" Maybe the extension is already contained in program; try without
" $PATHEXT.
let path = xolox#misc#path#merge(directory, program)
if executable(path)
call add(matches, path)
endif
endif
endif
endfor
endfor
return xolox#misc#list#unique(matches)
endfunction
function! xolox#misc#path#split(path) " {{{1
" Split a pathname (the first and only argument) into a list of pathname
" components.
"
" On Windows, pathnames starting with two slashes or backslashes are UNC
" paths where the leading slashes are significant... In this case we split
" like this:
"
" - Input: `'//server/share/directory'`
" - Result: `['//server', 'share', 'directory']`
"
" Everything except Windows is treated like UNIX until someone has a better
" suggestion :-). In this case we split like this:
"
" - Input: `'/foo/bar/baz'`
" - Result: `['/', 'foo', 'bar', 'baz']`
"
" To join a list of pathname components back into a single pathname string,
" use the `xolox#misc#path#join()` function.
if type(a:path) == type('')
if s:windows_compatible
if a:path =~ '^[\/][\/]'
" UNC pathname.
return split(a:path, '\%>2c[\/]\+')
else
" If it's not a UNC pathname we can simply split on slashes and
" backslashes, although we should preserve a leading slash (which
" denotes a pathname that is 'absolute to the current drive').
let absolute = (a:path =~ '^[\/]')
let segments = split(a:path, '[\/]\+')
return absolute ? insert(segments, a:path[0]) : segments
endif
else
" Everything else is treated as UNIX.
let absolute = (a:path =~ '^/')
let segments = split(a:path, '/\+')
return absolute ? insert(segments, '/') : segments
endif
endif
return []
endfunction
function! xolox#misc#path#join(parts) " {{{1
" Join a list of pathname components (the first and only argument) into a
" single pathname string. This is the counterpart to the
" `xolox#misc#path#split()` function and it expects a list of pathname
" components as returned by `xolox#misc#path#split()`.
if type(a:parts) == type([])
if s:windows_compatible
return join(a:parts, xolox#misc#path#directory_separator())
elseif get(a:parts, 0) == '/'
" Absolute path on UNIX (non-Windows).
return '/' . join(a:parts[1:], '/')
else
" Relative path on UNIX (non-Windows).
return join(a:parts, '/')
endif
endif
return ''
endfunction
function! xolox#misc#path#directory_separator() " {{{1
" Find the preferred directory separator for the platform and settings.
return exists('+shellslash') && &shellslash ? '/' : '\'
endfunction
function! xolox#misc#path#absolute(path) " {{{1
" Canonicalize and resolve a pathname, *regardless of whether it exists*.
" This is intended to support string comparison to determine whether two
" pathnames point to the same directory or file.
if type(a:path) == type('')
let path = a:path
" Make the pathname absolute.
if path =~ '^\~'
" Expand ~ to $HOME.
let path = $HOME . '/' . path[1:]
elseif xolox#misc#path#is_relative(path)
" Make relative pathnames absolute.
let path = getcwd() . '/' . path
endif
" Resolve symbolic links to find the canonical pathname. In my tests this
" also removes all symbolic pathname segments (`.' and `..'), even when
" the pathname does not exist. Also there used to be a bug in resolve()
" where it wouldn't resolve pathnames ending in a directory separator.
" Since it's not much trouble to work around, that's what we do.
let path = resolve(substitute(path, s:windows_compatible ? '[\/]\+$' : '/\+$', '', ''))
" Normalize directory separators (especially relevant on Windows).
let parts = xolox#misc#path#split(path)
if s:windows_compatible && parts[0] =~ '^[\/][\/]'
" Also normalize the two leading "directory separators" (I'm not
" sure what else to call them :-) in Windows UNC pathnames.
let parts[0] = repeat(xolox#misc#path#directory_separator(), 2) . parts[0][2:]
elseif s:windows_compatible && parts[0] =~ '^[\/]$'
" If a pathname is relative to the current drive we should add
" the drive letter in order to make the pathname absolute.
let parts[0] = matchstr(getcwd(), '^\a:')
endif
return xolox#misc#path#join(parts)
endif
return ''
endfunction
function! xolox#misc#path#relative(path, base) " {{{1
" Make an absolute pathname (the first argument) relative to a directory
" (the second argument).
let path = xolox#misc#path#split(a:path)
let base = xolox#misc#path#split(a:base)
while path != [] && base != [] && path[0] == base[0]
call remove(path, 0)
call remove(base, 0)
endwhile
let distance = repeat(['..'], len(base))
return xolox#misc#path#join(distance + path)
endfunction
function! xolox#misc#path#merge(parent, child, ...) " {{{1
" Join a directory pathname and filename into a single pathname.
if type(a:parent) == type('') && type(a:child) == type('')
" TODO Use xolox#misc#path#is_relative()?
if s:windows_compatible
let parent = substitute(a:parent, '[\\/]\+$', '', '')
let child = substitute(a:child, '^[\\/]\+', '', '')
return parent . '\' . child
else
let parent = substitute(a:parent, '/\+$', '', '')
let child = substitute(a:child, '^/\+', '', '')
return parent . '/' . child
endif
endif
return ''
endfunction
function! xolox#misc#path#commonprefix(paths) " {{{1
" Find the common prefix of path components in a list of pathnames.
let common = xolox#misc#path#split(a:paths[0])
for path in a:paths
let index = 0
for segment in xolox#misc#path#split(path)
if len(common) <= index
break
elseif common[index] != segment
call remove(common, index, -1)
break
endif
let index += 1
endfor
endfor
return xolox#misc#path#join(common)
endfunction
function! xolox#misc#path#starts_with(a, b) " {{{1
" Check whether the first pathname starts with the second pathname (expected
" to be a directory). This does not perform a regular string comparison;
" first it normalizes both pathnames, then it splits them into their
" pathname segments and then it compares the segments.
let a = xolox#misc#path#split(xolox#misc#path#absolute(a:a))
let b = xolox#misc#path#split(xolox#misc#path#absolute(a:b))
return a[0 : len(b) - 1] == b
endfunction
function! xolox#misc#path#encode(path) " {{{1
" Encode a pathname so it can be used as a filename. This uses URL encoding
" to encode special characters.
if s:windows_compatible
let mask = '[*|\\/:"<>?%]'
elseif xolox#misc#os#is_mac()
let mask = '[\\/%:]'
else
let mask = '[\\/%]'
endif
return substitute(a:path, mask, '\=printf("%%%x", char2nr(submatch(0)))', 'g')
endfunction
function! xolox#misc#path#decode(encoded_path) " {{{1
" Decode a pathname previously encoded with `xolox#misc#path#encode()`.
return substitute(a:encoded_path, '%\(\x\x\?\)', '\=nr2char("0x" . submatch(1))', 'g')
endfunction
" xolox#misc#path#equals(a, b) - Check whether two pathnames point to the same file. {{{1
if s:windows_compatible
function! xolox#misc#path#equals(a, b)
return a:a ==? a:b || xolox#misc#path#absolute(a:a) ==? xolox#misc#path#absolute(a:b)
endfunction
else
function! xolox#misc#path#equals(a, b)
return a:a ==# a:b || xolox#misc#path#absolute(a:a) ==# xolox#misc#path#absolute(a:b)
endfunction
endif
function! xolox#misc#path#is_relative(path) " {{{1
" Returns true (1) when the pathname given as the first argument is
" relative, false (0) otherwise.
if a:path =~ '^\w\+://'
return 0
elseif s:windows_compatible
return a:path !~ '^\(\w:\|[\\/]\)'
else
return a:path !~ '^/'
endif
endfunction
function! xolox#misc#path#tempdir() " {{{1
" Create a temporary directory and return the pathname of the directory.
if !exists('s:tempdir_counter')
let s:tempdir_counter = 1
endif
if exists('*mkdir')
if s:windows_compatible
let template = $TMP . '\vim_tempdir_'
elseif filewritable('/tmp') == 2
let template = '/tmp/vim_tempdir_'
endif
endif
if !exists('template')
throw "xolox#misc#path#tempdir() hasn't been implemented on your platform!"
endif
while 1
let directory = template . s:tempdir_counter
try
call mkdir(directory, '', 0700)
return directory
catch /^Vim\%((\a\+)\)\=:E739/
" Keep looking for a non-existing directory.
endtry
let s:tempdir_counter += 1
endwhile
endfunction
" vim: ts=2 sw=2 et