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builtins.adb.orig
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builtins.adb.orig
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------------------------------------------------------------------------------
-- Built-in Shell Commands --
-- --
-- Part of SparForte --
------------------------------------------------------------------------------
-- --
-- Copyright (C) 2001-2024 Free Software Foundation --
-- --
-- This is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. This is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with this; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- This is maintained at http://www.pegasoft.ca --
-- --
------------------------------------------------------------------------------
with ada.text_io,
--ada.strings.unbounded.text_io,
ada.strings.fixed,
gnat.source_info,
#if POSTGRES
APQ,
#else
#if MYSQL
APQ,
#end if;
#end if;
spar_os,
pegasoft.strings,
pegasoft.user_io,
world.utf8,
scanner.communications,
jobs,
--parser_aux,
parser_db,
parser_mysql;
use ada.text_io,
ada.strings,
--ada.strings.unbounded.text_io,
ada.strings.fixed,
#if POSTGRES
APQ,
#else
#if MYSQL
APQ,
#end if;
#end if;
pegasoft,
pegasoft.strings,
jobs,
pegasoft.user_io,
--world,
world.utf8,
scanner,
scanner.communications,
--parser_aux,
parser_db,
parser_mysql;
package body builtins is
-----------------------------------------------------------------------------
-- FIND PWD
--
-- Assign the current working directory to the current_working_directory
-- variable.
-- Determine current working directory and assign it to the current_working_
-- directory variable, else assign it a null string.
-- loosely modelled on bash/builtins/cd.def
-- cmd is the command asking for the pwd, or eof_t for the interpreter on
-- startup.
-----------------------------------------------------------------------------
buffer : string( 1..4096 );
procedure findPwd( cmd : identifier := eof_t ) is
begin
C_reset_errno;
getcwd( buffer, buffer'length );
if C_errno = ENOENT then
if cmd = eof_t then
err(
subjectNotes => subjectInterpreter,
reason => +"cannot read your current directory because",
obstructorNotes => em("it was deleted"),
remedy => pl( "use " ) & em( "cd" ) & pl(" to select another known directory " ) &
pl( "or use the " ) & em( "OLDPWD" ) & pl( " variable to see what your pwd was" )
);
else
err(
subject => cmd,
reason => +"cannot read your current directory because",
obstructorNotes => em("it was deleted"),
remedy => pl( "use " ) & em( "cd" ) & pl(" to select another known directory " ) &
pl( "or use the " ) & em( "OLDPWD" ) & pl( " variable to see what your pwd was" )
);
end if;
elsif C_errno = EACCES then
if cmd = eof_t then
err(
subjectNotes => subjectInterpreter,
reason => +"cannot read your current directory because",
obstructorNotes => em("you don't have or no longer have permission")
);
else
err(
subject => cmd,
reason => +"cannot read your current directory because",
obstructorNotes => em("you don't have or no longer have permission")
);
end if;
elsif C_errno /= 0 then
-- other possibilities are out of range, too long, etc.
err(
contextNotes => pl( "At " & gnat.source_info.source_location &
" while finding the current working directory" ),
subjectNotes => subjectInterpreter,
reason => +"had an internal error because syscall getcwd() returned",
obstructorNotes => getEmOSError
);
current_working_directory := null_unbounded_string;
end if;
current_working_directory := to_unbounded_string(
buffer( 1..index( buffer, ASCII.NUL & "" ) - 1 ) ) ;
end findPwd;
-----------------------------------------------------------------------------
-- BIND PWD
--
-- Assign the current working directory to the current_working_directory
-- variable.
-- loosely modelled on bash/builtins/cd.def
-----------------------------------------------------------------------------
procedure bindPwd( cmd : identifier ) is
-- procedure bindPwd( cmd : identifier; symlinks : boolean := false ) is
begin
findPwd( cmd );
if current_working_directory /= null_unbounded_string then
-- SYMBOLIC LINKS TO BE HANDLED HERE LATER
--findIdent( to_unbounded_string( "PWD" ), pwd );
--findIdent( to_unbounded_string( "OLDPWD" ), oldpwd );
--if identifiers( pwd ).kind = string_t then
-- if identifiers( oldpwd ).kind = string_t then
-- identifiers( oldpwd ).value := identifiers( pwd ).value;
-- end if;
-- identifiers( pwd ).value := current_working_directory;
--end if;
null;
end if;
end bindPwd;
-----------------------------------------------------------------------------
-- OLD_PWD
--
-- Old version of the builtin pwd command used in previous versions of Bush.
-- Syntax: old_pwd
-- loosely modelled on bash/builtins/cd.def
-----------------------------------------------------------------------------
function old_pwd return unbounded_string is
-- pwd: present working directory
begin
bindPwd( pwd_t );
return current_working_directory;
end old_pwd;
-----------------------------------------------------------------------------
-- OLD_CD
--
-- Old version of the builtin cd command used in previous versions of Bush.
-- Syntax: old_cd s
-- loosely modelled on bash/builtins/cd.def
-----------------------------------------------------------------------------
procedure old_cd( s : unbounded_string ) is
-- APPLY CHANGE
--
-- Change the directory and, if successful, update related environment
-- variables. Return true if change was successful. Does not capture
-- errno value.
----------------------------------------------------------------------------
function apply_change( s : unbounded_string ) return boolean is
pwd, oldpwd : identifier;
result : integer;
begin
result := chdir( to_string( s ) & ASCII.NUL );
if result = 0 then
bindPwd( cd_t );
-- it should also not take into account the nesting (should be global)
findIdent( to_unbounded_string( "PWD" ), pwd );
findIdent( to_unbounded_string( "OLDPWD" ), oldpwd );
if pwd /= eof_t then
if oldpwd /= eof_t then
identifiers( oldpwd ).value.all := identifiers( pwd ).value.all;
end if;
identifiers( pwd ).value.all := current_working_directory;
end if;
end if;
return result = 0;
end apply_change;
path : unbounded_string := s;
newpath : unbounded_string;
showPath : boolean := false;
temp_id : identifier;
obstructorStr : unbounded_string;
remedySuggestion : messageStrings := nullMessageStrings;
errno : integer := 0;
begin
if length( path ) = 0 then -- no path?
path := to_unbounded_string( "$HOME" ); -- then go home
-- Normally, tilde is substituted in a shell word expansion.
-- However, we may end up here if AdaScript parameters are used.
elsif Element( path, 1 ) = '~' then -- leading tilde?
Delete( path, 1, 1 ); -- shortform for
Insert( path, 1, "$HOME" ); -- home
elsif path = "-" then -- minus path?
path := to_unbounded_string( "$OLDPWD" ); -- short for OLDPWD
showPath := inputMode = interactive or inputMode = breakout;
end if;
if head( path, 5 ) = "$HOME" then
findIdent( to_unbounded_string( "HOME" ), temp_id );
Delete( path, 1, 5 );
Insert( path, 1, to_string( identifiers( temp_id ).value.all ) );
elsif head( path, 7 ) = "$OLDPWD" then
findIdent( to_unbounded_string( "OLDPWD" ), temp_id );
Delete( path, 1, 7 );
Insert( path, 1, to_string( identifiers( temp_id ).value.all ) );
end if;
-- CDPATH support not yet implmeneted. Should go HERE, but
-- is CDPATH such a good idea anyway? Not usually!
-- Apply the directory change. If we're in an interactive mode, attempt
-- solutions to common problems. Ignore an error on these solutions
-- and only show original error if the solutions do not help.
-- TODO: if not assumed, an effective solution should be in the error
-- message remedy
if not apply_change( path ) then
errno := c_errno; -- save original error
-- user chose a file rather than a directory
if c_errno = ENOTDIR then -- not a directory?
newpath := dirname( path ); -- try parent directory
if newpath /= "." then -- unless it's current
if inputMode = interactive or inputMode = breakout then
if apply_change( newpath ) then
errno := c_errno; -- should be no error
put_trace( "Assuming directory " & to_string( toCtrlEscaped( newpath ) ) );
end if;
else
remedySuggestion := +"select the parent directory of the file";
end if;
end if;
end if;
-- user has a path with leading or trailing spaces
-- this only checks the path as a whole, not the individual items
if c_errno = ENOENT then -- no such path?
newpath := trim( path, both ); -- try trimming space
if newpath /= path then -- unless no difference
if inputMode = interactive or inputMode = breakout then
if apply_change( newpath ) then
errno := c_errno; -- should be no error
put_trace( "Assuming leading or trailing spaces should be trimmed" );
end if;
else
remedySuggestion := +"trim leading or trailing spaces";
end if;
end if;
end if;
-- user has wrong directory delimiter
if c_errno = ENOENT then
if index( path, "\" ) > 0 and directory_delimiter = '/' then
newpath := replaceAll( path, to_unbounded_string( "\" ),
to_unbounded_string( "/" ), false );
if inputMode = interactive or inputMode = breakout then
if apply_change( newpath ) then
errno := c_errno; -- should be no error
put_trace( "Assuming directory delimiter should be a forward slash" );
end if;
else
remedySuggestion := +"directory delimiter is a forward slash";
end if;
end if;
end if;
if c_errno = ENOENT then
if index( path, "/" ) > 0 and directory_delimiter = '\' then
newpath := replaceAll( path, to_unbounded_string( "/" ),
to_unbounded_string( "\" ), false );
if inputMode = interactive or inputMode = breakout then
if apply_change( newpath ) then
errno := c_errno; -- should be no error
put_trace( "Assuming directory delimiter should be a backslash" );
end if;
else
remedySuggestion := +"directory delimiter is a backslash";
end if;
end if;
end if;
end if;
if errno /= 0 then
-- better messages for common cd use cases
if errno = ENOENT then
obstructorStr := to_unbounded_string( "the directory does not exist" );
elsif errno = ENOTDIR then
obstructorStr := to_unbounded_string( "it is not a directory" );
elsif errno = EACCES or c_errno = EFAULT then
obstructorStr := to_unbounded_string( "it is not accessible" );
else
obstructorStr := to_unbounded_string( "syscall chdir returned " & OSerror( c_errno ) );
end if;
err(
contextNotes => pl( "in " ) & unb_pl( current_working_directory ),
subjectNotes => em_value( path ),
reason => +"could not be selected because",
obstructorNotes => unb_em( obstructorStr ),
remedy => remedySuggestion
);
end if;
if showPath then
put_line_retry( current_working_directory );
end if;
end old_cd;
-----------------------------------------------------------------------------
-- ALTER (SQL COMMAND)
--
-- alter : SQL alter - change database configuration
-- Syntax: alter shell_word
-----------------------------------------------------------------------------
procedure alter( ap : argumentListPtr ) is
-- alter : SQL alter
tempStr : unbounded_string;
begin
if ap'length /= 1 then
err(
contextNotes => contextInSQL,
subjectNotes => em( "alter" ),
reason => +"expects arguments but",
obstructorNotes => em( "there are no arguments" ),
seeAlso => +"doc/ref_db.html"
);
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
if not engineOpen then
err(
contextNotes => contextInSQL,
subjectNotes => em( "alter" ),
reason => +"needs a database connection but",
obstructorNotes => em( "no connection is open" ),
remedy => +"open a connection with the mysql or db package"
);
elsif currentEngine = Engine_PostgreSQL then
#if POSTGRES
DoSQLStatement( "alter " & tempStr );
#else
err( +"postgresql support not configured" );
#end if;
elsif currentEngine = Engine_MySQL then
#if MYSQL
DoMySQLSQLStatement( "alter " & tempStr );
#else
err( +"mysql support not configured" );
#end if;
else
err(
contextNotes => pl( "At " & gnat.source_info.source_location &
" in the SQL statement" ),
subjectNotes => subjectInterpreter,
reason => +"had an internal error because it did not expect",
obstructorNotes => pl( "database engine " & currentEngine'img )
);
end if;
end if;
end alter;
-----------------------------------------------------------------------------
-- CLEAR (POSIX SHELL COMMAND)
--
-- clear : clear the screen / reset the terminal screen
-- Syntax: clear
-----------------------------------------------------------------------------
procedure clear( ap : argumentListPtr ) is
term_id : identifier;
begin
if ap'length /= 0 then
err(
contextNotes => contextInCommand,
subject => clear_t,
reason => +"expects no arguments but",
-- the problem here is is/are for 1+ arguments if the length is used
obstructorNotes => em( "there are arguments" ),
seeAlso => seeShellCmds
);
elsif isExecutingCommand then
findIdent( to_unbounded_string( "TERM" ), term_id );
terminalClear( identifiers( term_id ).value.all );
end if;
end clear;
-----------------------------------------------------------------------------
-- UMASK (POSIX SHELL COMMAND)
--
-- umask : set the umask
-- Syntax: umask
-----------------------------------------------------------------------------
procedure umask( ap : argumentListPtr ) is
tempStr : unbounded_string;
newMask : mode_t;
oldMask : mode_t;
discard : mode_t;
remedySuggestion : unbounded_string;
begin
expectNonRestrictedShell( "umask" );
if ap'length > 1 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "umask" ),
reason => +"expects zero or one arguments but",
obstructorNotes => em( "there are" & ap'length'img & " arguments" ),
remedy => +"read the summary of umask with in help command",
seeAlso => seeShellCmds
);
elsif ap'length = 0 then
if isExecutingCommand then
-- umask never fails
oldMask := spar_os.umask( 0 );
discard := spar_os.umask( oldMask );
put_line_retry( oldMask'img );
-- TODO: we cannot guarantee that put_line will handle redirection
-- properly.
end if;
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
begin
newMask := mode_t'value( to_string( tempStr ) );
-- At the command prompt, give help for suspicious illegal values,
-- This list is some common values and is not exhaustive.
if newMask = 777 then
remedySuggestion := to_unbounded_string( "you mean decimaal 0" );
if inputMode = interactive or inputMode = breakout then
put_trace( "Assuming " & to_string( remedySuggestion ) );
newMask := 0;
end if;
elsif newMask = 775 then
remedySuggestion := to_unbounded_string( "you mean octal 3 / decimaal 3" );
if inputMode = interactive or inputMode = breakout then
put_trace( "Assuming " & to_string( remedySuggestion ) );
newMask := 3;
end if;
elsif newMask = 755 then
remedySuggestion := to_unbounded_string( "you mean octal 22 / decimaal 18" );
if inputMode = interactive or inputMode = breakout then
put_trace( "Assuming " & to_string( remedySuggestion ) );
newMask := 18;
end if;
elsif newMask = 700 then
remedySuggestion := to_unbounded_string( "you mean octal 77 / decimaal 63" );
if inputMode = interactive or inputMode = breakout then
put_trace( "Assuming " & to_string( remedySuggestion ) );
newMask := 63;
end if;
elsif newMask = 644 then
remedySuggestion := to_unbounded_string( "you mean octal 133 / decimaal 91" );
if inputMode = interactive or inputMode = breakout then
put_trace( "Assuming " & to_string( remedySuggestion ) );
newMask := 91;
end if;
elsif newMask = 600 then
remedySuggestion := to_unbounded_string( "you mean octal 177 / decimaal 127" );
if inputMode = interactive or inputMode = breakout then
put_trace( "Assuming " & to_string( remedySuggestion ) );
newMask := 127;
end if;
end if;
-- At least in Linux,the umask can only be the file
-- permission bits (0777 = 511).
if newMask > 511 then
err(
contextNotes => +"in the " & em( "umask" ) & pl( " command" ),
subjectNotes => +"the decimal " & em( "mask value " ) &
em_value( tempStr ),
reason => +"is not in the range of",
obstructorNotes => em( "0..511" ),
remedy => unb_pl( remedySuggestion ),
seeAlso => seeShellCmds
);
-- err( +"value should be in range 0..511" );
else
-- umask never fails
discard := spar_os.umask( newMask );
end if;
exception when constraint_error =>
err(
contextNotes => +"in the " & em( "umask" ) & pl( " command" ),
subjectNotes => +"the decimal " & em( "mask value" ),
reason => +"was expected to be numeric but is",
obstructorNotes => em_value( tempStr ),
seeAlso => seeShellCmds
);
when others =>
err_exception_raised;
end;
end if;
end umask;
-----------------------------------------------------------------------------
-- DELETE (SQL COMMAND)
--
-- delete : SQL delete
-- Syntax: delete shell_word
-----------------------------------------------------------------------------
procedure delete( ap : argumentListPtr ) is
tempStr : unbounded_string;
begin
if ap'length /= 1 then
err(
contextNotes => contextInSQL,
subjectNotes => em( "delete" ),
reason => +"expects arguments but",
obstructorNotes => em( "there are no arguments" ),
seeAlso => +"doc/ref_db.html"
);
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
if not engineOpen then
err(
contextNotes => contextInSQL,
subjectNotes => em( "delete" ),
reason => +"needs a database connection but",
obstructorNotes => em( "no connection is open" ),
remedy => +"open a connection with the mysql or db package"
);
elsif currentEngine = Engine_PostgreSQL then
#if POSTGRES
DoSQLStatement( "delete " & tempStr );
#else
err( +"postgres support not configured" );
#end if;
elsif currentEngine = Engine_MySQL then
#if MYSQL
DoMySQLSQLStatement( "delete " & tempStr );
#else
err( +"mysql support not configured" );
#end if;
else
err(
contextNotes => pl( "At " & gnat.source_info.source_location &
" while " ) & contextInSQL,
subjectNotes => subjectInterpreter,
reason => +"had an internal error because it did not expect",
obstructorNotes => pl( "database engine " & currentEngine'img )
);
end if;
end if;
end delete;
-----------------------------------------------------------------------------
-- DO HISTORY (POSIX SHELL COMMAND)
--
-- history: shell history control
-- history [-c | n]
-----------------------------------------------------------------------------
procedure do_history( ap : argumentListPtr ) is
i : integer;
historyMax : natural := 0;
historyFirst : natural := 0;
showHistory : boolean := false;
tempStr : unbounded_string;
begin
if ap'length = 0 then
null;
elsif ap'length /= 1 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "history" ),
reason => +"expects zero or one arguments but",
obstructorNotes => em( "there are" & ap'length'img & " arguments" ),
remedy => +"read the summary of history in the help command",
seeAlso => +"doc/ref_shellcmds.html"
);
return;
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
if tempStr = "-c" then
clearHistory;
return;
end if;
historyMax := natural( to_numeric( tempStr ) );
if historyMax > historyArray'last then
historyMax := historyArray'last;
end if;
end if;
-- If the user has requested a maximum number of lines (historyMax),
-- then calculate the first line (historyFirst) to be shown. If all
-- should be shown, turn on showHistory flag immediately.
if historyMax /= 0 then
if historyNext - historyMax < 1 then
historyFirst := historyArray'last - historyMax + historyNext;
else
historyFirst := historyNext- historyMax;
end if;
end if;
showHistory := historyFirst = 0 or historyFirst = historyNext;
-- Determine the starting point in the history array. The history
-- array wraps around to the first element when it has been filled.
if historyNext = historyArray'last then
i := 1;
else
i := historyNext + 1;
end if;
-- Walk the history array and show the contents. Wrap around when the
-- end of array is reached.
loop
if i = historyArray'last then
i := 1;
end if;
exit when i = historyNext;
if historyFirst = i then
showHistory := true;
end if;
if length( history( i ).line ) > 0 then
if showHistory then
put_retry( i'img );
put_retry( ": " );
put_retry( getDateString( history( i ).time ) );
put_retry( " " & utf_verticalLine & " " );
put_retry( history( i ).pwd );
put_retry( " " & utf_verticalLine & " " );
put_line_retry( history( i ).line );
end if;
end if;
i := i + 1;
end loop;
end do_history;
-----------------------------------------------------------------------------
-- INSERT (SQL COMMAND)
--
-- insert: SQL insert - add a row to a database table
-- Syntax: insert shell_word
-----------------------------------------------------------------------------
procedure insert( ap : argumentListPtr ) is
tempStr : unbounded_string;
begin
if ap'length /= 1 then
err(
contextNotes => contextInSQL,
subjectNotes => em( "insert" ),
reason => +"expects arguments but",
obstructorNotes => em( "there are no arguments" ),
seeAlso => +"doc/ref_db.html"
);
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
if not engineOpen then
err(
contextNotes => contextInSQL,
subjectNotes => em( "insert" ),
reason => +"needs a database connection but",
obstructorNotes => em( "no connection is open" ),
remedy => +"open a connection with the mysql or db package"
);
elsif currentEngine = Engine_PostgreSQL then
#if POSTGRES
DoSQLStatement( "insert " & tempStr );
#else
err( +"postgres support not configured" );
#end if;
elsif currentEngine = Engine_MySQL then
#if MYSQL
DoMySQLSQLStatement( "insert " & tempStr );
#else
err( +"mysql support not configured" );
#end if;
else
err(
contextNotes => pl( "At " & gnat.source_info.source_location &
" while " ) & contextInSQL,
subjectNotes => subjectInterpreter,
reason => +"had an internal error because it did not expect",
obstructorNotes => pl( "database engine " & currentEngine'img )
);
end if;
end if;
end insert;
-----------------------------------------------------------------------------
-- CD (POSIX SHELL COMMAND)
--
-- cd: change current directory
-- Syntax: cd - | shell_word
-----------------------------------------------------------------------------
procedure cd( ap : argumentListPtr ) is
tempStr : unbounded_string;
begin
expectNonRestrictedShell( "cd -|dirname" );
if ap'length /= 1 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "cd" ),
reason => +"expects one arguments but",
obstructorNotes => em( "there are" & ap'length'img & " arguments" ),
remedy => pl( "use " & '"' & "cd ~" & '"' & " to return to your home directory" ),
seeAlso => +"doc/ref_shellcmds.html"
);
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
old_cd( tempStr );
end if;
end cd;
-----------------------------------------------------------------------------
-- JOBS (POSIX SHELL COMMAND)
--
-- jobs: show a list of running background jobs
-- Syntax: jobs
-----------------------------------------------------------------------------
procedure jobs( ap : argumentListPtr ) is
-- jobs: list running jobs
begin
if ap'length /= 0 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "jobs" ),
reason => +"expects no arguments but",
-- the problem here is is/are for 1+ arguments if the length is used
obstructorNotes => em( "there are arguments" ),
seeAlso => +"doc/ref_shellcmds.html"
);
elsif isExecutingCommand then
putJobList;
end if;
end jobs;
-----------------------------------------------------------------------------
-- PWD (POSIX SHELL COMMAND)
--
-- pwd: show the present (current) working directory
-- Syntax: pwd
-----------------------------------------------------------------------------
procedure pwd( ap : argumentListPtr ) is
-- pwd: present working directory (also updated current_working_directory)
begin
if ap'length /= 0 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "pwd" ),
reason => +"expects no arguments but",
-- the problem here is is/are for 1+ arguments if the length is used
obstructorNotes => em( "there are arguments" ),
seeAlso => +"doc/ref_shellcmds.html"
);
elsif isExecutingCommand then
-- Old PWD is a function call.
put_line_retry( old_pwd );
end if;
end pwd;
-----------------------------------------------------------------------------
-- SELECT (SQL COMMAND)
--
-- select: SQL select - display rows from database tables
-- Syntax: select shell_word
-----------------------------------------------------------------------------
procedure SQLselect( ap : argumentListPtr ) is
-- SQL select: SQL select statement
tempStr : unbounded_string;
begin
-- put_line( "length = " & ap'length'img ); -- DEBUG
-- if ap'length > 0 then
-- put_line( "param = " & ap( 1 ).all );
-- end if;
if ap'length /= 1 then
err(
contextNotes => +"in the SQL statement",
subjectNotes => em( "select" ),
reason => +"expects arguments but",
obstructorNotes => em( "there are no arguments" ),
seeAlso => +"doc/ref_db.html"
);
elsif isExecutingCommand then
tempStr := to_unbounded_string( ap( 1 ).all );
delete( tempStr, length( tempStr ), length( tempStr ) );
if not engineOpen then
err(
contextNotes => contextInSQL,
subjectNotes => em( "select" ),
reason => +"needs a database connection but",
obstructorNotes => em( "no connection is open" ),
remedy => +"open a connection with the mysql or db package"
);
elsif currentEngine = Engine_PostgreSQL then
#if POSTGRES
DoSQLSelect( "select " & tempStr );
#else
err( +"postgresql support not supported" );
#end if;
elsif currentEngine = Engine_MySQL then
#if MYSQL
DoMySQLSQLSelect( "select " & tempStr );
#else
err( +"mysql support not supported" );
#end if;
else
err(
contextNotes => pl( "At " & gnat.source_info.source_location &
" while " ) & contextInSQL,
subjectNotes => subjectInterpreter,
reason => +"had an internal error because it did not expect",
obstructorNotes => pl( "database engine " & currentEngine'img )
);
end if;
end if;
end SQLselect;
-----------------------------------------------------------------------------
-- STEP (SparForte BUILTIN)
--
-- step: in breakout mode, run the next line and show a command prompt
-- Syntax: step
-----------------------------------------------------------------------------
-- See also ParseStep in parser.
procedure step( ap : argumentListPtr ) is
begin
if ap'length /= 0 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "step" ),
reason => +"expects no arguments but",
-- the problem here is is/are for 1+ arguments if the length is used
obstructorNotes => em( "there are arguments" ),
seeAlso => +"doc/ref_shellcmds.html"
);
elsif inputMode /= breakout then
err(
contextNotes => contextInCommand,
subjectNotes => em( "step" ),
reason => +"can only be used when you",
obstructorNotes => em( "break out of a script" ),
seeAlso => +"doc/ref_shellcmds.html"
);
elsif isExecutingCommand then
done := true;
breakoutContinue := true;
stepFlag1 := true;
put_trace( "stepping" );
end if;
end step;
-----------------------------------------------------------------------------
-- DO TRACE (SparForte BUILTIN)
--
-- trace: turn source line tracing on or off, or show the current setting
-- Syntax: trace [true | false ]
-----------------------------------------------------------------------------
procedure do_trace( ap : argumentListPtr ) is
tempStr : unbounded_string;
begin
if ap'length = 0 then
if isExecutingCommand then
if trace then
put_line_retry( "Trace is currently on" );
else
put_line_retry( "Trace is currently off" );
end if;
end if;
elsif ap'length > 1 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "trace" ),
reason => +"expects zero or one arguments but",
obstructorNotes => em( "there are" & ap'length'img & " arguments" ),
remedy => +"read the summary of trace in the help command",
seeAlso => +"doc/ref_shellcmds.html"
);
elsif isExecutingCommand then -- or syntax_check then -- when debugging
-- true (boolean) will be a value of 1, but true (shell word) will be
-- "true". This is not ideal since it should really check types.
tempStr := to_unbounded_string( ap( 1 ).all );
if ( tempStr = "true" & ASCII.NUL ) or ( tempStr = "1" & ASCII.NUL ) then
-- For security, don't trace in a production environment
-- unless running in breakout input mode. This is because
-- tracing can reveal confidential information in variables.
-- (Tracing can still be invoked via the command options.)
-- It's also not allow in testing mode because it will catch
-- it in continuous integration before going to production.
-- GCC Ada 7.4 gives a conversion warning but is incorrect.
if inputMode /= breakout and boolean(maintenanceOpt or testOpt) then
err(
contextNotes => contextInCommand,
subjectNotes => em( "trace" ),
reason => +"cannot be changed in testing or maintenance phase mode unless at",
obstructorNotes => em( "a breakout prompt" ),
seeAlso => +"doc/ref_shellcmds.html"
);
else
trace := true;
put_line_retry( "Trace is on" );
end if;
elsif ( tempStr = "false" & ASCII.NUL ) or ( tempStr = "0" & ASCII.NUL ) then
trace := false;
put_line_retry( "Trace is off" );
else
err(
contextNotes => contextInCommand,
subjectNotes => em( "trace" ),
reason => +"expected a boolean value not",
obstructorNotes => em_value( delete( tempStr, length( tempStr ), length( tempStr ) ) ),
seeAlso => seeShellCmds
);
end if;
end if;
end do_trace;
-----------------------------------------------------------------------------
-- UNSET (POSIX SHELL COMMAND)
--
-- unset: remove an identifier from the symbol table
-- Syntax: unset identifier
-- Note: this uses a word, not an identifier token as in older versions of
-- SparForte. If SparForte becomes more complex, this may need to be redesigned.
-----------------------------------------------------------------------------
procedure unset( ap : argumentListPtr ) is
tempStr : unbounded_string;
identToUnset : identifier;
begin
expectNonRestrictedShell( "unset" );
if ap'length /= 1 then
err(
contextNotes => contextInCommand,
subjectNotes => em( "unset" ),
reason => +"expects one arguments but",
obstructorNotes => em( "there are" & ap'length'img & " arguments" ),
remedy => +"read the summary of unset in the help command",
seeAlso => seeShellCmds
);