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SiBoRG/libraries/relativepath.m
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relativepath.m
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function rel_path = relativepath( tgt_path, act_path )
%RELATIVEPATH returns the relative path from an actual path to the target path.
% Both arguments must be strings with absolute paths.
% The actual path is optional, if omitted the current dir is used instead.
% In case the volume drive letters don't match, an absolute path will be returned.
% If a relative path is returned, it always starts with '.\' or '..\'
%
% Syntax:
% rel_path = RELATIVEPATH( target_path, actual_path )
%
% Parameters:
% target_path - Path which is targetted
% actual_path - Start for relative path (optional, default = current dir)
%
% Examples:
% relativepath( 'C:\local\data\matlab' , 'C:\local' ) = '.\data\matlab\'
% relativepath( 'A:\MyProject\' , 'C:\local' ) = 'a:\myproject\'
%
% relativepath( 'C:\local\data\matlab' , cd ) is the same as
% relativepath( 'C:\local\data\matlab' )
%
% See also: ABSOLUTEPATH PATH
% Modified by Simon Blanchoud, 2014
% - Added support for filenames
% - Removed the case insensitivity
% Jochen Lenz
if isempty(tgt_path) | isequal(tgt_path(1), '.')
rel_path = tgt_path;
return;
else
[file_path, name, ext] = fileparts(tgt_path);
if (~isempty(ext))
tgt_path = file_path;
name = [name ext];
else
name = [];
end
end
% 2nd parameter is optional:
if nargin < 2
act_path = cd;
end
% Predefine return string:
rel_path = '';
% Make sure strings end by a filesep character:
if length(act_path) == 0 | ~isequal(act_path(end),filesep)
act_path = [act_path filesep];
end
if length(tgt_path) == 0 | ~isequal(tgt_path(end),filesep)
tgt_path = [tgt_path filesep];
end
% Convert to all lowercase:
%[act_path] = fileparts( lower(act_path) );
%[tgt_path] = fileparts( lower(tgt_path) );
[act_path] = fileparts(act_path);
[tgt_path] = fileparts(tgt_path);
% Create a cell-array containing the directory levels:
act_path_cell = pathparts(act_path);
tgt_path_cell = pathparts(tgt_path);
% If volumes are different, return absolute path:
if length(act_path_cell) == 0 | length(tgt_path_cell) == 0
return % rel_path = ''
else
if ~isequal( act_path_cell{1} , tgt_path_cell{1} )
rel_path = tgt_path;
return
end
end
% Remove level by level, as long as both are equal:
while length(act_path_cell) > 0 & length(tgt_path_cell) > 0
if isequal( act_path_cell{1}, tgt_path_cell{1} )
act_path_cell(1) = [];
tgt_path_cell(1) = [];
else
break
end
end
% As much levels down ('..\') as levels are remaining in "act_path":
for i = 1 : length(act_path_cell)
rel_path = ['..' filesep rel_path];
end
% Relative directory levels to target directory:
for i = 1 : length(tgt_path_cell)
rel_path = [rel_path tgt_path_cell{i} filesep];
end
% Start with '.' or '..' :
if isempty(rel_path)
rel_path = ['.' filesep];
elseif ~isequal(rel_path(1),'.')
rel_path = ['.' filesep rel_path];
end
if (~isempty(name))
rel_path = [rel_path name];
end
return
% -------------------------------------------------
function path_cell = pathparts(path_str)
path_str = [filesep path_str filesep];
path_cell = {};
sep_pos = findstr( path_str, filesep );
for i = 1 : length(sep_pos)-1
path_cell{i} = path_str( sep_pos(i)+1 : sep_pos(i+1)-1 );
end
return
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