Full path of current file

Question

This question led to a new package:
currfile-abspath (subpackage to currfile)

How can I display the full path of the tex file that I compile? It is a simple file, no include or input present.

Edit: I use MiKTeX 2.9 on a Windows 7 64-bit.

Less demanding: If not possible, then I will be satisfied with a partial path (at least one or two folders up + the filename).

Answer 1

The full path is written into the .fls file generated by the -recorder option with TeXLive (MikTeX should have a similar option, maybe --recorder). This file seems to be flushed every line while it is being written, so that it is possible to read the paths of all files accessed so far in the current compiler run.

I wrote the following code to search for a INPUT <path><jobname>.tex line in the .fls file. It also read the first PWD <parent directory> line which is used if the jobname is local. This was actually the easy part and should cover 99.99% of all cases. I just added the remaining parsing code to allow for situations like pdflatex /direct/path/to/document.tex. This should cover usages of -output-directory as well.

I might add this code in my currfile package.

\documentclass{article}

\makeatletter
\def\thepwd@default{./}
\let\thepwd\thepwd@default
\let\theabspath\@empty
\newcommand\getabspath{%
    \begingroup
    \edef\filename{\jobname.tex}%
    \@onelevel@sanitize\filename%
    \let\thepwd\thepwd@default
    \let\theabspath\@empty
    \IfFileExists{\jobname.fls}{%
        \openin\@inputcheck=\jobname.fls\relax
        \endlinechar\m@ne
        \readline\@inputcheck to \line
        \expandafter\getabspath@extr\line\relax\relax\relax\relax\relax
        \expandafter\getabspath@defs\expandafter{\filename}%
        \loop
            \readline\@inputcheck to \line
            \@onelevel@sanitize\line
            \expandafter\getabspath@path\expandafter{\line}%
            \ifeof\@inputcheck
                \let\iterate\relax
            \fi
            \ifx\theabspath\@empty
        \repeat
        \closein\@inputcheck
    }{%
        \PackageWarning{getabspath}
            {The required recorder file (.fls) was not found.\MessageBreak
             Please compile with the '-recorder' option.\MessageBreak
             Occurred}%
    }%
    \ifx\theabspath\@empty
        \let\theabspath\thepwd
    \fi
    \edef\@tempa{%
        \def\noexpand\thepwd{\thepwd}%
        \def\noexpand\theabspath{\theabspath}%
    }%
    \expandafter
    \endgroup
    \@tempa
}
\def\getabspath@extr#1#2#3#4#5\relax{%
    \edef\@tempa{\detokenize{#1#2#3}}%
    \edef\@tempb{\detokenize{PWD}}%
    \ifx\@tempa\@tempb
       \edef\thepwd{\detokenize{#4#5/}}%
    \fi
}

\begingroup
\catcode`I=12
\catcode`N=12
\catcode`P=12
\catcode`U=12
\catcode`T=12
\gdef\getabspath@defs#1{%
    \def\getabspath@@path ##1INPUT ##2#1\relax##3\relax##4\@nnil{%
        \ifx\@empty##4\@empty\else
            \def\theabspath{##2}%
        \fi
    }%
    \def\getabspath@path##1{%
        \getabspath@@path##1\relax INPUT \@empty#1\relax{}\relax\@nnil
    }%
}
\endgroup
\makeatother

\getabspath
\message{Absolute path: \theabspath^^J}
\message{PWD: \thepwd^^J}
\begin{document}
This file has the absolute path \texttt{\theabspath\jobname.tex}.

PWD: \texttt{\thepwd}
\end{document}

---

Update 2011/05/05:

I have now made this functionality part of my currfile package. It is provided as a sub-package currfile-abspath, which can also be used on its own. It provides \getmainfile, \getabspath{<file>} and \getpwd which set \themainfile, \theabspath and \thepwd to the main file name (which might be different from \jobname.tex), the absolute path of the given file and the parent working directory of the compiler run.

This new version of currfilej has now been released as v0.6 2011/05/06.

Answer 2

Martin suggested me to write a LuaTeX version, so here it is. :)

Run with lualatex:

\documentclass{article}

\usepackage{luacode}
\usepackage[T1]{fontenc}

\begin{luacode}
-- we need the LuaFileSystem
-- library
require 'lfs'

-- builds path according to the system
-- path separator, as I used in this answer:
-- http://tex.stackexchange.com/a/48241/3094
function buildPath(...)

    -- get the system path separator
    local pathseparator = package.config:sub(1,1)

    -- get the arguments
    local elements = {...}

    -- return the elements with the path separator
    return table.concat(elements, pathseparator)
end

-- get the current path plus the file name.
function getPath(filename)

    -- print the input command. According to the
    -- documentation, if -2 is used, then the strings
    -- are read as if the result of detokenize: all
    -- characters have catcode 12 except space, which
    -- has catcode 10.
    tex.print(-2, buildPath(lfs.currentdir(), filename))

end
\end{luacode}

\newcommand\fullpath[1]{\luadirect{getPath(\luastring{#1})}}

\begin{document}

\fullpath{\jobname.tex}

\end{document}

The output when in my Windows machine:

And when in my Linux box:

Hope it helps. :)

Answer 3

Here's a solution that works on Unix systems and pdflatex -shell-escape:

\makeatletter
\def\fullpath{\begingroup\everyeof{\noexpand}\@sanitize
  \edef\x{\@@input|"find `pwd` -name \jobname.tex" }%
  \edef\x{\endgroup\noexpand\zap@space\x\noexpand\@empty}\x}
\makeatother

Then \fullpath will print the full path of the file you're typesetting.

There's really no way to get the full path from inside TeX, so an escape to the operating system is necessary.

Answer 4

This is now standard LaTeX functionality: \CurrentFilePath gives the directory that this file lives on (relative or absolute depending on how it was imported).

This is documented here: Internal Package ltfilehook