Installation Instructions
-------------------------

Please follow the instructions below to build and install tasksh from source.


Dependencies
------------

You will need the CMake build system installed in order to build tasksh from
source.  Information on cmake can be obtained at http://cmake.org

Additionally, you will need:

  libreadline


Basic Installation
------------------

Briefly, these shell commands will unpack, build and install Tasksh:

  $ tar xzf tasksh-X.Y.Z.tar.gz                   [1]
  $ cd tasksh-X.Y.Z                               [2]
  $ cmake -DCMAKE_BUILD_TYPE=release .            [3]
  $ make                                          [4]
  $ sudo make install                             [5]
  $ cd .. ; rm -r tasksh-X.Y.Z                    [6]

These commands are explained below:

  1. Unpacks the source tarball.  This creates the directory tasksh-X.Y.Z,
     containing all the code.

  2. Change directory to the root of the distribution.

  3. Invokes CMake to scan for dependencies and machine-specific details, then
     generate the makefiles.  Requests an optimized build, which will run faster
     and be more compact.  This may take a minute.

  4. Builds tasksh.  This may take a minute.

  5. Installs the program, documentation and other data files.

  6. Removes the temporary directory.


Build and configurations options
--------------------------------

You can customize the configuration run with cmake variables. This will modify
the installation process:

To change the installation directory you use the following configuration
variable:

  $ cmake -DCMAKE_INSTALL_PREFIX=<path-to-installation-dir> .

cmake configuration variables are applied with the -D option and consist of a
<name> and a <value>:

  $ cmake -D<name>=<value> .

Four more variables can customize the installation process. The following table
lists them and their defaults plus the CMAKE_INSTALL_PREFIX:

  CMAKE_INSTALL_PREFIX  /usr/local
  TASKSH_BINDIR         bin
  TASKSH_DOCDIR         share/doc/tasksh
  TASKSH_MAN1DIR        share/man/man1

The corresponding TASKSH_* variables will be combined with CMAKE_INSTALL_PREFIX to
get absolute installation directories:

  CMAKE_INSTALL_PREFIX/TASKSH_BINDIR   /usr/local/bin
  CMAKE_INSTALL_PREFIX/TASKSH_DOCDIR   /usr/local/share/doc/tasksh
  CMAKE_INSTALL_PREFIX/TASKSH_MAN1DIR  /usr/local/share/man/man1


Uninstallation
--------------

There is no uninstall option in CMake makefiles. This is a manual process.

To uninstall Tasksh, remove the files listed in the install_manifest.txt file
that was generated when you built Tasksh.


Tasksh Build Notes
-----------------------

Tasksh has dependencies that are detected by CMake in almost all cases, but
there are situations and operating systems that mean you will need to offer a
little help.

If Tasksh will not build on your system, first take a look at the Operating
System notes below.  If this doesn't help, then go to the Troubleshooting
section, which includes instructions on how to contact us for help.


Operating System Notes
----------------------

Cygwin
  If 'make install' fails when writing to the /usr/local/share/ directory,
  this may be because your current login doesn't have permission to write
  to the Windows directory containing your Cygwin installation. Either
  login to Windows as an Administrator and try the 'make install' process
  again, or reinstall Cygwin under your normal Windows login.


Troubleshooting
---------------

If you've recently made changes to dependencies (by reinstalling them, for
example) be sure to rerun 'cmake .' before trying to execute 'make' again.

CMake will run and locate all the necessary pieces for the build, and create
a Makefile.  There may be errors and warnings when running CMake, or there
may be compiler errors and warnings when running 'make'.  Sometimes you will run
CMake with no reported problems, and the build will fail later.  This is
almost always because CMake is mistaken about some assumption.

If a build does not succeed, please send the contents of the 'CMakeCache.txt'
and 'CMakeFiles/CMakeOutput.log' files to support@taskwarrior.org.

If CMake runs but tasksh does not build, please send the contents of the above
files as well as a transcript from the build, which is not written to a file
and must be captured from the terminal.

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