Merge pull request #483 from awvwgk/working-directory

Allow fpm to change the working directory

3 files changed, 137 insertions, 10 deletions

diff --git a/src/fpm_command_line.f90 b/src/fpm_command_line.f90
index 2a2ecf5..f44bcd0 100644
--- a/src/fpm_command_line.f90
+++ b/src/fpm_command_line.f90
@@ -46,6 +46,7 @@ public :: fpm_cmd_settings, &
           get_command_line_settings
 
 type, abstract :: fpm_cmd_settings
+    character(len=:), allocatable :: working_dir
     logical                      :: verbose=.true.
 end type
 
@@ -119,6 +120,7 @@ contains
         integer                       :: i
         integer                       :: widest
         type(fpm_install_settings), allocatable :: install_settings
+        character(len=:), allocatable :: common_args, working_dir
 
         call set_help()
         ! text for --version switch,
@@ -148,12 +150,14 @@ contains
            if(adjustl(cmdarg(1:1)) .ne. '-')exit
         enddo
 
+        common_args = '--directory:C " " '
+
         ! now set subcommand-specific help text and process commandline
         ! arguments. Then call subcommand routine
         select case(trim(cmdarg))
 
         case('run')
-            call set_args('&
+            call set_args(common_args //'&
             & --target " " &
             & --list F &
             & --all F &
@@ -206,7 +210,7 @@ contains
             & verbose=lget('verbose') )
 
         case('build')
-            call set_args( '&
+            call set_args(common_args // '&
             & --profile " " &
             & --list F &
             & --show-model F &
@@ -228,7 +232,7 @@ contains
             & verbose=lget('verbose') )
 
         case('new')
-            call set_args('&
+            call set_args(common_args // '&
             & --src F &
             & --lib F &
             & --app F &
@@ -298,7 +302,7 @@ contains
             endif
 
         case('help','manual')
-            call set_args('&
+            call set_args(common_args // '&
             & --verbose F &
             & ',help_help,version_text)
             if(size(unnamed).lt.2)then
@@ -346,7 +350,8 @@ contains
             call printhelp(help_text)
 
         case('install')
-            call set_args('--profile " " --no-rebuild F --verbose F --prefix " " &
+            call set_args(common_args // '&
+                & --profile " " --no-rebuild F --verbose F --prefix " " &
                 & --list F &
                 & --compiler "'//get_env('FPM_COMPILER','gfortran')//'" &
                 & --flag:: " "&
@@ -371,7 +376,7 @@ contains
             call move_alloc(install_settings, cmd_settings)
 
         case('list')
-            call set_args('&
+            call set_args(common_args // '&
             & --list F&
             & --verbose F&
             &', help_list, version_text)
@@ -380,7 +385,7 @@ contains
                call printhelp(help_list_dash)
             endif
         case('test')
-            call set_args('&
+            call set_args(common_args // '&
             & --target " " &
             & --list F&
             & --profile " "&
@@ -425,7 +430,7 @@ contains
             & verbose=lget('verbose') )
 
         case('update')
-            call set_args('--fetch-only F --verbose F --clean F', &
+            call set_args(common_args // ' --fetch-only F --verbose F --clean F', &
                 help_update, version_text)
 
             if( size(unnamed) .gt. 1 )then
@@ -441,7 +446,7 @@ contains
 
         case default
 
-            call set_args('&
+            call set_args(common_args // '&
             & --list F&
             & --verbose F&
             &', help_fpm, version_text)
@@ -462,6 +467,12 @@ contains
             call printhelp(help_text)
 
         end select
+
+        if (allocated(cmd_settings)) then
+            working_dir = sget("directory")
+            call move_alloc(working_dir, cmd_settings%working_dir)
+        end if
+
     contains
 
     subroutine check_build_vals()
@@ -674,6 +685,8 @@ contains
     '    install [--profile PROF] [--flag FFLAGS] [--no-rebuild] [--prefix PATH] [options]', &
     '                                                                       ', &
     'SUBCOMMAND OPTIONS                                                     ', &
+    ' -C, --directory PATH', &
+    '             Change working directory to PATH before running any command', &
     ' --profile PROF    selects the compilation profile for the build.',&
     '                   Currently available profiles are "release" for',&
     '                   high optimization and "debug" for full debug options.',&
diff --git a/src/fpm_filesystem.f90 b/src/fpm_filesystem.f90
index 28c3b33..c9c97dd 100644
--- a/src/fpm_filesystem.f90
+++ b/src/fpm_filesystem.f90
@@ -10,7 +10,7 @@ use,intrinsic :: iso_fortran_env, only : stdin=>input_unit, stdout=>output_unit,
     private
     public :: basename, canon_path, dirname, is_dir, join_path, number_of_rows, read_lines, list_files, env_variable, &
             mkdir, exists, get_temp_filename, windows_path, unix_path, getline, delete_file, to_fortran_name
-    public :: fileopen, fileclose, filewrite, warnwrite
+    public :: fileopen, fileclose, filewrite, warnwrite, parent_dir
 
     integer, parameter :: LINE_BUFFER_LEN = 1000
 
@@ -184,6 +184,15 @@ function dirname(path) result (dir)
 
 end function dirname
 
+!> Extract dirname from path
+function parent_dir(path) result (dir)
+    character(*), intent(in) :: path
+    character(:), allocatable :: dir
+
+    dir = path(1:scan(path,'/\',back=.true.)-1)
+
+end function parent_dir
+
 
 !> test if a name matches an existing directory path
 logical function is_dir(dir)
diff --git a/src/fpm_os.F90 b/src/fpm_os.F90
new file mode 100644
index 0000000..71663fe
--- /dev/null
+++ b/src/fpm_os.F90
@@ -0,0 +1,105 @@
+module fpm_os
+    use, intrinsic :: iso_c_binding, only : c_char, c_int, c_null_char, c_ptr, c_associated
+    use fpm_error, only : error_t, fatal_error
+    implicit none
+    private
+    public :: change_directory, get_current_directory
+
+#ifndef _WIN32
+    character(len=*), parameter :: pwd_env = "PWD"
+#else
+    character(len=*), parameter :: pwd_env = "CD"
+#endif
+
+    interface
+        function chdir(path) result(stat) &
+#ifndef _WIN32
+                bind(C, name="chdir")
+#else
+                bind(C, name="_chdir")
+#endif
+            import :: c_char, c_int
+            character(kind=c_char, len=1), intent(in) :: path(*)
+            integer(c_int) :: stat
+        end function chdir
+
+        function getcwd(buf, bufsize) result(path) &
+#ifndef _WIN32
+                bind(C, name="getcwd")
+#else
+                bind(C, name="_getcwd")
+#endif
+            import :: c_char, c_int, c_ptr
+            character(kind=c_char, len=1), intent(in) :: buf(*)
+            integer(c_int), value, intent(in) :: bufsize
+            type(c_ptr) :: path
+        end function getcwd
+    end interface
+
+contains
+
+    subroutine change_directory(path, error)
+        character(len=*), intent(in) :: path
+        type(error_t), allocatable, intent(out) :: error
+
+        character(kind=c_char, len=1), allocatable :: cpath(:)
+        integer :: stat
+
+        allocate(cpath(len(path)+1))
+        call f_c_character(path, cpath, len(path)+1)
+
+        stat = chdir(cpath)
+
+        if (stat /= 0) then
+            call fatal_error(error, "Failed to change directory to '"//path//"'")
+        end if
+    end subroutine change_directory
+
+    subroutine get_current_directory(path, error)
+        character(len=:), allocatable, intent(out) :: path
+        type(error_t), allocatable, intent(out) :: error
+
+        character(kind=c_char, len=1), allocatable :: cpath(:)
+        integer(c_int), parameter :: buffersize = 1000_c_int
+        type(c_ptr) :: tmp
+
+        allocate(cpath(buffersize))
+
+        tmp = getcwd(cpath, buffersize)
+        if (c_associated(tmp)) then
+            call c_f_character(cpath, path)
+        else
+            call fatal_error(error, "Failed to retrieve current directory")
+        end if
+
+    end subroutine get_current_directory
+
+    subroutine f_c_character(rhs, lhs, len)
+        character(kind=c_char), intent(out) :: lhs(*)
+        character(len=*), intent(in) :: rhs
+        integer, intent(in) :: len
+        integer :: length
+        length = min(len-1, len_trim(rhs))
+
+        lhs(1:length) = transfer(rhs(1:length), lhs(1:length))
+        lhs(length+1:length+1) = c_null_char
+
+    end subroutine f_c_character
+
+    subroutine c_f_character(rhs, lhs)
+        character(kind=c_char), intent(in) :: rhs(*)
+        character(len=:), allocatable, intent(out) :: lhs
+
+        integer :: ii
+
+        do ii = 1, huge(ii) - 1
+            if (rhs(ii) == c_null_char) then
+                exit
+            end if
+        end do
+        allocate(character(len=ii-1) :: lhs)
+        lhs = transfer(rhs(1:ii-1), lhs)
+
+    end subroutine c_f_character
+
+end module fpm_os