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I attempted to install the Traffic library for the book "A Touch of Class" but was not able to compile the examples. EiffelStudio complained about a base2.ecf file. Error code: VD00

General configuration parsing error. What to do: fix the configuration file.

Could not open file: \base2.ecf $EIFFELBASE2\base2.ecf

base2.ecf is found in where Windows installed Eiffel: C:\Program Files\Eiffel Software\EiffelStudio 18.11 GPL\unstable\library\base2.ecf The offending line of code seems to be this in the Traffic configuration files:

I have attempted to change this configuration file pointing directly to where the file is, using the actual path, to no avail.

I'm really stuck in how to pass an argument to a second level of an Eiffel agent call. Hope my example is enough self explaining:

main_call
    do
        b (agent d(?, ?))
    end

b (a_proc: PROCEDURE[STRING])
    local
        l_something_else: INTEGER
    do
        l_something_else := 1
--        z("a_line", a_proc(l_something_else)) -- How can I pass at this stade l_something_else to the d procedure!!!
    end

d (line: STRING; something_else: INTEGER)
    do
--        do_some_stuff_with_line (line, something_else)
        do_nothing
    end

z (a_line: STRING; a_proc: PROCEDURE[STRING])
    do
        a_proc.call([a_line])
    end

I would have liked to be able to do something like

z("a_line", a_proc(?, something_else))

But its not possible, as I try with the agent keyword, the a_proc argument is not recognized!

So what would be the syntax? I even tried to add an argument to a_proc with a_proc.set_operands but am lost with the OPEN_ARGS class

Implementation case

If you need a goal... just imagine I'd like to have 2 different implementations of the d function, and in my case its using UT_CSV_HANDLER that I'd like to have 2 different functions for each line of a CVS

The following code gives a Non-compatible actual argument in feature call

Feature: import_from_csv_impl
Called feature: import_from_csv_impl (a_rest_request: REST_REQUEST; a_procedure: PROCEDURE [DS_ARRAYED_LIST [STRING_8], INTEGER_64, STRING_8]): [detachable like items] detachable SIT_LINKED_LIST [MEASURING_POINT] from MEASURING_POI...
Argument name: ia_name
Argument position: 2
Formal argument type: STRING_8
Actual argument type: INTEGER_64
Line: 258
                ia_procedure.call (ia_measuring_point_id, ia_name)
->            end (?, l_measuring_point_id, l_s)
            l_csv_handler.read_file (l_is, l_partially_closed)

The complete example:

-- Main call
import_from_abb_csv (a_rest_request: REST_REQUEST): detachable like items 
    do
        Result := import_from_csv_impl (a_rest_request, agent impl_for_each_csv_line_import_from_abb_csv)
    end

-- Second call
import_from_csv_impl (a_rest_request: REST_REQUEST; a_procedure: PROCEDURE[DS_ARRAYED_LIST [STRING_8], INTEGER_64, STRING]): detachable like items
    local
        l_csv_handler: UT_CSV_HANDLER
        l_is: KL_STRING_INPUT_STREAM
        l_measuring_point_id: INTEGER_64
        l_s: STRING
        l_partially_closed: PROCEDURE[DS_ARRAYED_LIST[STRING]]
    do
        l_s := "whatever"
        l_measuring_point_id := 12
        create l_csv_handler.make_with_separator (',')

        l_partially_closed := agent (i_al: DS_ARRAYED_LIST[STRING]; ia_measuring_point_id: INTEGER_64; ia_name: STRING; ia_procedure: PROCEDURE[INTEGER_64, STRING])
            do
                ia_procedure.call (ia_measuring_point_id, ia_name)
            end (?, l_measuring_point_id, l_s)

        l_csv_handler.read_file (l_is, l_partially_closed)

    end

-- end call
impl_for_each_csv_line_import_from_abb_csv (a_csv_line: DS_ARRAYED_LIST [STRING_8]; a_measuring_point_id: INTEGER_64; l_cu_name: STRING)
    do
        -- do_my_business
    end


-- for information signature of read_file is:
--     read_file (a_file: KI_TEXT_INPUT_STREAM; a_action: PROCEDURE [DS_ARRAYED_LIST [STRING]])

General

I don't understand why there are like 2 generating_type kinds, the one with exclamation point, and the other not.

My case

I have a function returning a DB_SERVICE[G] from a given instance from a collection of db_services so that from another service I can retrieve it and call it. When I pass an instance generating_type to that function, the conforms_to returns True, as when I give ({ENUMERATE}).generating_type it doesn't.

Why is that so?

-- Humanly unreadable
if attached {ENUMERATE_DB_SERVICE} {SIT_ENVIRONMENT}.app_instance.db_service_from_entity_type (item_prototype.charge_unit_relationship.secondary_prototype.an_index_relationship.secondary_prototype.generating_type) as l_enum_dbs then

-- Humanly readable but not working
if attached {ENUMERATE_DB_SERVICE} {SIT_ENVIRONMENT}.app_instance.db_service_from_entity_type (({ENUMERATE}).generating_type) as l_enum_dbs then

My function

db_service_from_entity_type (an_entity_type: TYPE[detachable DB_ENTITY]): detachable like db_services.item
    do
        across
            db_services as l_dbs
        until
            Result /= Void
        loop
            if l_dbs.item.item_prototype.generating_type.conforms_to (an_entity_type) then
                Result := l_dbs.item
            end
        end
    ensure
        service_found: attached Result
    end

Edit (20190405-11:26 UTC)

As the screenshot shows, giving {ENUMERATE} instead of ({ENUMERATE}).generating_type doesn't work either

Seems I'm wrong creating a datetime from string using this method, any idea why? The precondition violates on date_time_valid: date_time_valid (s, code)

create l_date_time.make_from_string ("2019-03-28T15:28:02Z", "yyyy-mm-ddThh:mi:ssZ")

If I'd like to add a DATE_TIME to a logger for example I'd like to avoid creating a local variable for that. Is there any similar statement as

create {DATE_TIME}.make_now.formatted_out ("yyyy-mm-dd hh:mi:ss")

which is not possible?

As I have the choice on finalizing a project to keep assertions, I'd think that assertion violation would be shown or displayed on console (hopefully on stderr on linux). What would be the proper way to do such, like seems that I have to add it or enable something to get it...

Some of my tests needs something like

{EXECUTION_ENVIRONMENT}.arguments.separate_character_option_value ('l')

to be attached (not Void), how do I set commandline arguments to eiffel autotest?

It's not the first time I'm trying to inherit from a class and convert an object to it, in this case extend functionalities of HTTP_CLIENT_RESPONSE with valid_http_response => response.status = 200, valid_http_json_body => validate json content, etc...

For that, I'd like to inherit from HTTP_CLIENT_RESPONSE and add features and create my custom DB_ENTITY_HTTP_CLIENT_RESPONSE from an HTTP_CLIENT_RESPONSE

test_case
    local
        l_http_client_r: HTTP_CLIENT_RESPONSE
        l_db_entity_http_client_r: DB_ENTITY_HTTP_CLIENT_RESPONSE
    do
        l_http_client_r := execute_get("someURL") -- returns an HTTP_CLIENT_RESPONSE
        l_db_entity_http_client_r := l_http_client_r
        assert("valid response", l_db_entity_http_client_r.valid_response)
    end

it seems I've difficulties having the internal properties set... what would be the best way to do this? I had the same case trying to create a WATT class inheriting from NATURAL_32 which is an expanded.

In my strategy, I tried to call in creator

• a parent creation procedure
• then call a deep_copy

Here is the rest of my class attempt:

class
    DB_ENTITY_HTTP_CLIENT_RESPONSE

inherit
    HTTP_CLIENT_RESPONSE

create
    make_from_http_client_response

convert
    make_from_http_client_response ({HTTP_CLIENT_RESPONSE})

feature -- Initialization

    make_from_http_client_response (a_client_response: HTTP_CLIENT_RESPONSE)
        do
            make (a_client_response.url)
            deep_copy (a_client_response)
        end

feature -- Status report

    valid_response: BOOLEAN
        do
            Result := status = 200
        end

The only way I found working for now is by setting all attributes to other which is the semantic of deep_copy normally...

make_from_http_client_response (a_client_response: HTTP_CLIENT_RESPONSE)
    do
        make (a_client_response.url)
        set_body (a_client_response.body)
        set_http_version (a_client_response.http_version)
        set_error_occurred (a_client_response.error_occurred)
        set_error_message (a_client_response.error_message)
        set_raw_header (a_client_response.raw_header)
        set_status_line (a_client_response.status_line)
        ... I surely forgot something...
    end

across
    collection as l_item
until 
    Result /= Void
loop
    if l_item.item.name.is_equal ("foo") then
        Result := l_item.item
    end
end

is there a way and if so which one to do something like

collection.do_if (agent ...)

an example of use can be:

search_item_with_id (an_id: INTEGER)
        -- Moves items cursor if not found is_after
    local
        l_found: BOOLEAN
    do
        from
            items.start
        until
            items.after or l_found
        loop
            l_found := items.item.primary_key = an_id
            if not l_found then
                items.forth
            end
        end
    ensure
        cursor_on_element_if_found: not items.after implies items.item.primary_key = an_id
    end

Eiffel

Seems I'm getting an INTEGER_32_REF from a BIGINT from ODBC with Eiffel DB_SELECTION.cursor. Sometimes I seem to have the adecuate value, but sometimes not...

946383958 => good INTEGER_32_REF (id->4 of following table)
9475984837 => 886050245 WRONG INTEGER_32_REF (id->4 of following table)

646383958 => good INTEGER_32_REF (id->3 of following table)
6475984837 => -2113949755 WRONG INTEGER_32_REF (id->4 of following table)

...

It seems to behave like not treating the BIGINT and giving the INTEGER_32_REF value directly interpreted from the DB value, typical case passing over the 2^32

Postgresql

Having a table with following data as electricity_amount BIGINT NOT NULL DEFAULT 0

id |   a_date   |  amount   | electricity_amount | consumption_sector_id | electricity_rate_id
----+------------+-----------+--------------------+-----------------------+---------------------
1 | 2019-01-01 | 746383958 |         7475984837 |                     1 |                   1
2 | 2019-02-01 | 846383958 |         8475984837 |                     1 |                   1
3 | 2019-03-01 | 646383958 |         6475984837 |                     1 |                   1
4 | 2019-04-01 | 946383958 |         9475984837 |                     1 |                   1

I don't understand why it is so.

• If I say attached {G} it works
• If I say nothing which would be the expected behavior for me calling_entity: detachable RELATED_DB_ENTITY should be conform (once attached) to G which is -> DB_ENTITY
• If I say DB_ENTITY it doesn't
• If I say RELATED_DB_ENTITY either does it pass

Why do I have to specify {G}???

SIT_HANDLER

class
    SIT_HANDLER[G -> DB_ENTITY create default_create, make_from_db_service, make_from_json end]

feature --

    some_feature
        do
            if attached {G} l_rest_request.calling_entity as l_calling_entity then
                db_service.set_item_prototype (l_calling_entity) -- Complains here!!!!!!!!!!!!
                db_service.load_with_relationships (l_rest_request)
            ...
        end
end -- class

REST_REQUEST

class
    REST_REQUEST

feature -- Access
    calling_entity: detachable RELATED_DB_ENTITY -- RELATED_DB_ENTITY inherits DB_ENTITY
...
end -- class

DB_SERVICE

class
    DB_SERVICE [G -> DB_ENTITY create default_create, make_from_db_service, make_from_json end]

feature -- Status setting

    item_prototype: G

    set_item_prototype (v: like item_prototype)
        do
            item_prototype := v
        ensure
            item_prototype = v
        end

...
end -- class

How to set a constant refering to another class constant in Eiffel?

Something like that doesn't compile unfortunately

Default_log_level: like {MY_LOGGER}.log_level = {MY_LOGGER}.Log_level_info

Trying to transform a real_32 to real_64, I'm getting

real_32: 61.55
real_64: 61.54999923706055 

Am I wrong with the to_double function?

Didn't find a better way to format a multiline string than this way... seems complicated. What would be the best way to format this type of code?

l_qry := "SELECT%
    %    * %
    %FROM %
    %    enumerate %
    %WHERE %
    %    " + {like item_prototype}.Primary_key_db_column_name + " = " + l_category_id + " %
    %UNION %
    %   SELECT %
    %       e.* %
    %   FROM %
    %       enumerate e %
    %INNER JOIN  %
    %   enumerates_leaves s ON s." + {like item_prototype}.Primary_key_db_column_name + " = e." + {like item_prototype}.Category_db_column_name + " %
    %) SELECT * FROM enumerates_leaves WHERE enumerates_leaves." + {like item_prototype}.Category_db_column_name + " IS NOT NULL;"

I was wondering if the across structure uses an own cursor or a separated one? does it ensure that cursor hasn't moved and if so how can it be expressed for other examples?

How to use the old keyword into ensure clause of a feature, the current statement doesn't seem to be valid at runtime

relationships: CHAIN -- any chain

some_feature
    do
    (...)
    ensure
        relationship_added: attached relationships as l_rel implies
            attached old relationships as l_old_rel and then
            l_rel.count = l_old_rel.count
    end

For the whole case, following screenshots demonstrate the case

start of routine execution end of routine execution

I was wondering if there is a clearer statement then

if not attached foo then
    create foo
end
if attached foo as l_foo then
    l_foo.bark
end

as

if not attached foo then
    create foo
    foo.bark
else
    foo.bark
end

would repeat the foo.bark and obviously I want to avoid it... and even the last statement won't compile with void-safety as foo on else could be void...

I'm looking for a way to ensure that cursor: detachable DB_RESULT from DB_SELECTION class hasn't moved. I didn't find any method to get access to it. Does the following statement ensure it?

    ensure
        cursor_not_moved: a_db_service.cursor.is_equal(old a_db_service.cursor)

The item method for example doesn't seem to ensure that even if it is only consulting a value of a given row index

Not sure exactly, but it makes various time I got a Error: variable is not properly set. in creation procedures' calling order. I figured out that creating class attributes before calling default_create seemed to solve the problem. Why is that so? It doesn't seem that default_create calls something in my make routine??!!!

Try to make an example even if I don't think I can reproduce it with a simple example...

Working

class A

feature

    attr: B

    make
        do
            create attr
            default_create
        end

end

Error: variable is not properly set.

class A

feature

    attr: B

    make
        do
            default_create
            create attr
        end

end

How is the correct way to change the signature of a feature in Eiffel if any? if there is no option as I understood, how would be the correct way to define in a parent class that there will be a feature to be able to select but still don't know arguments number and types (types are resolvable with polymorphism...)

Is the only available playing with polymorphism having an argument into class a to select of type ANY?

class SELECTABLE

class SELECTABLE

    select
        deferred 
        end

end -- class

class DB_SERVICE

class DB_SERVICE

inherit
    SELECTABLE
        (...)

feature -- Status setting


    select (a_db_connection: DB_CONNECTION)
        local
            l_qry: STRING
        do
            item := first_item_from_qry (l_qry)
        end

end -- class

Trying to implement some test cases on EWF application with rest web services and JSON objects, I'm gettint a Error: type is based on unknown class. after adding my first class inheriting from EQA_TEST_SET

Seems pretty complicated to implement test cases for a simple curl -v --header "Content-Type: application/json" --request POST --data '{"id":11,"name":"someName","enumerate":{"id":5}}' http://localhost:9997/someEntity curl command! How can I do that? Where is there some example? I'm trying to copy-paste the example from $ISE_LIBRARY/contrib/library/web/framework/ewf/wsf/tests/src/test_wsf_request.e as a base, but for the moment....

I can find the class when browsing the dependencies as shown in screenshot, but the compiler not! strange behaviour!

My app_ewf_app.ecf

<?xml version="1.0" encoding="ISO-8859-1"?>
<system xmlns="http://www.eiffel.com/developers/xml/configuration-1-19-0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.eiffel.com/developers/xml/configuration-1-19-0 http://www.eiffel.com/developers/xml/configuration-1-19-0.xsd" name="sit_ewf_app" uuid="0AB55F0B-014A-4775-B93F-ACC31C9300D5">
    <target name="common" abstract="true">
        <file_rule>
            <exclude>/CVS$</exclude>
            <exclude>/EIFGENs$</exclude>
            <exclude>/\.svn$</exclude>
        </file_rule>
        <option warning="true">
            <assertions precondition="true" postcondition="true" check="true" invariant="true" loop="true" supplier_precondition="true"/>
        </option>
        <capability>
            <catcall_detection support="none"/>
            <concurrency support="scoop"/>
            <void_safety support="all" use="all"/>
        </capability>
        <library name="base" location="$ISE_LIBRARY\library\base\base-safe.ecf"/>
        <library name="http" location="$ISE_LIBRARY\contrib\library\network\protocol\http\http-safe.ecf"/>
        <library name="json" location="$ISE_LIBRARY\contrib\library\text\parser\json\library\json.ecf"/>
        <library name="lexical" location="$ISE_LIBRARY\contrib\library\gobo\library\lexical\library.ecf"/>
        <library name="logging" location="$ISE_LIBRARY\library\runtime\logging\logging.ecf"/>
        <library name="odbc" location="$ISE_LIBRARY\library\store\dbms\rdbms\odbc\odbc.ecf"/>
        <library name="store" location="$ISE_LIBRARY\library\store\store.ecf"/>
        <library name="time" location="$ISE_LIBRARY\library\time\time.ecf"/>
        <library name="wsf" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\wsf-safe.ecf"/>
        <library name="wsf_extension" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\wsf_extension.ecf"/>
        <cluster name="database" location=".\database\" recursive="true"/>
        <cluster name="entity" location=".\entity\" recursive="true"/>
        <cluster name="error" location=".\error\" recursive="true"/>
        <cluster name="handler" location=".\handler\" recursive="true"/>
        <cluster name="logger" location=".\logger\" recursive="true"/>
        <cluster name="misc" location=".\misc\" recursive="true"/>
        <cluster name="relationship" location=".\relationship\" recursive="true"/>
        <cluster name="rest" location=".\rest\" recursive="true"/>
        <cluster name="service" location=".\service\" recursive="true"/>
        <cluster name="sit-json" location=".\sit-json\" recursive="true"/>
        <!-- TESTS -->
        <cluster name="tests" location=".\tests\" recursive="true"/>
    </target>
    <target name="ewf_app_any" extends="common">
        <root class="EWF_APP" feature="make_and_launch"/>
        <capability>
            <concurrency support="scoop"/>
        </capability>
        <library name="cgi" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\connector\cgi-safe.ecf"/>
        <library name="libfcgi" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\connector\libfcgi-safe.ecf"/>
        <library name="standalone" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\connector\standalone-safe.ecf"/>
        <cluster name="launcher" location=".\launcher\">
            <cluster name="any_launcher" location="$|any\"/>
        </cluster>
        <cluster name="src" location=".\src\" recursive="true"/>
    </target>
    <target name="ewf_app_standalone" extends="common">
        <root class="EWF_APP" feature="make_and_launch"/>
        <capability>
            <catcall_detection support="none"/>
            <concurrency support="scoop"/>
            <void_safety support="all"/>
        </capability>
        <variable name="httpd_ssl_disabled" value="true"/>
        <library name="default_standalone" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\default\standalone-safe.ecf"/>
        <library name="eel" location="$ISE_LIBRARY\contrib\library\text\encryption\eel\eel.ecf"/>
        <library name="ewsgi" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\ewsgi\ewsgi.ecf"/>
        <library name="http_client" location="$ISE_LIBRARY\contrib\library\network\http_client\http_client.ecf"/>
        <library name="testing" location="$ISE_LIBRARY\library\testing\testing-safe.ecf"/>
        <cluster name="launcher" location=".\launcher\">
            <cluster name="default_launcher" location="$|default\"/>
        </cluster>
        <cluster name="src" location=".\src\" recursive="true"/>
    </target>
    <target name="ewf_app_cgi" extends="common">
        <root class="EWF_APP" feature="make_and_launch"/>
        <capability>
            <concurrency support="scoop" use="none"/>
        </capability>
        <library name="default_cgi" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\default\cgi-safe.ecf"/>
        <cluster name="launcher" location=".\launcher\">
            <cluster name="default_launcher" location="$|default\"/>
        </cluster>
        <cluster name="src" location=".\src\" recursive="true"/>
    </target>
    <target name="ewf_app_libfcgi" extends="common">
        <root class="EWF_APP" feature="make_and_launch"/>
        <capability>
            <concurrency support="scoop" use="none"/>
        </capability>
        <library name="default_libfcgi" location="$ISE_LIBRARY\contrib\library\web\framework\ewf\wsf\default\libfcgi-safe.ecf"/>
        <cluster name="launcher" location=".\launcher\">
            <cluster name="default_launcher" location="$|default\"/>
        </cluster>
        <cluster name="src" location=".\src\" recursive="true"/>
    </target>
    <target name="ewf_app" extends="ewf_app_any">
    </target>
</system>

My error

I have an unknown identifier on the local like some_values.cursor, I really don't understand why!

qry_update_set_fields (some_keys, some_values, some_unstored_field_names: LINKED_LIST[STRING]): STRING
    require
        same_some_keys_some_values_count: some_keys.count = some_values.count
    local
        l_val_c: like some_values.new_cursor
    do
        Result := ""
        l_val_c := some_values.new_cursor
        across
            some_keys as l_key_c
        loop
            Result := l_key_c.item + "=" + l_val_c.item + ","
            l_val_c.forth
        end
        if Result.ends_with (",") then
            Result.remove_tail (1)
        end
    ensure
        dont_modify_parameters: old some_keys.is_equal (some_keys) and old some_values.is_equal (some_values)
    end

working

l_val_c: LINKED_LIST_CURSOR [STRING]

Neither working

l_val_c: LINKED_LIST_CURSOR [like some_values.item]

I have a warning I cannot get rid of neither understand:

Eiffel: Call use obsolete feature. Call to feature `to_string_8': Use 'name_32' instead

item_prototype is a DB_SERVICE where I redefine out

if attached {APP_CONFIGURATION}.application_instance.selected_entity_primary_key ({SIT_UTIL}.class_name_lowercase ({like item_prototype})) as l_pk then

One more point is that I wasn't able to copy the warning msg to my clipboard, how do I do that? if there is a way into EiffelStudio.

After stopping an EWF app and starting it again in a Address already in use: c_bind Address already in use: IO_FAILURE raised

As explained here, it seems that TCP socket timeout is not available for some time before being released by OS.

If I want to have the content value as string of a JSON_OBJECT.item ("key") without having to

some_json_value_as_string: STRING
    do
        if attached {JSON_STRING} l_json_o as l_s then
            Result := l_s.unescaped_string_8
        elseif attached {JSON_NUMBER} l_json_o as l_n then
            Result := l_n.item.out
        else
            check
                you_forgot_to_treat_a_case: False
            end
        end
    end

for a json object like

{
|       |       "datasource_name": "DODBC",
|       |       "datasource_username": "dev_db_usr",
|       |       "datasource_password": "somePassword",
|       |       "ewf_listening_port": 9997,
|       |       "log_file_path": "/var/log/ewf_app.log",
|       |       "default_selected_company": 1,
|       |       "default_selected_branch": 1,
|       |       "default_selected_consumption_sector": 1,
|       |       "default_selected_measuring_point": 1,
|       |       "default_selected_charge_unit": -1
|       }

the {JSON_VALUE}.representation with io.putstring is:

datasource_username=dev_db_usr

and not the value only!!!

is there a way to do that? I didn't find intuitive the different methods of JSON_VALUE: values as the out method gives the class and pointer address, which is really far from a string representation of the associated json object for me...

Here's what I have so far.

create {LINKED_LIST[INTEGER]} list.make
from
    i := 0
    list.start
until
    i = 11
loop
    list.put(i)
    i := i + 1
    list.forth
end

The debugger points to line list.put(i). I think the problem is that list is not properly initialized? I'm having a bit of an issue with figuring out how to use linked_list because I can't find any proper tutorial to help with. As you can see, I am just trying to write a LINKED_LIST program that adds numbers [0,10] in a linked list. Not a school project. Just practicing ahead of an upcoming course. Please help!

I didn't find any notion of timezone DATE_TIME class and TIME class. Am I wrong?

How do I handle timezones with Eiffel library?

Is there a way to specify it from the {DATE_TIME}.formated_out ("YYYY-MM-DD [0]hh:[0]mi:[0]ss")

Is there a setter for timezone?

I already got this problem with the logger which is logging with UTC...

The only workaround I found was l.hour_add (-3) before the formated_out which is really dirty

feature 

    open_file_sample
        local
            l_file: UNIX_FILE_INFO
            l_path: STRING
        do
            make
            l_path := "/var/log/syslog"
            l_file.update (l_path)
            if l_file.parent_directory.exists and then l_file.parent_directory.is_writtable then
                create l_file.make
            end
             -- AS the above statement doesn't exist!
            check
                syslog_file_exists_and_is_readable: l_file.exists and then l_file.is_readable
            end
        end

Is this the proper way to check for file existence in Eiffel?

I was wondering if there is a way not to create 2 objects. I'll complete my check with following statement:

• define path `l_file_path := "/some/path/with_file.log"
• check if parent directory exists and has rights to write into
• create log file

Does this work for removing first two children from a node?

remove_children(current_node : CURSOR_TREE[EXPRESSION]) 
        do
            current_node.down (1)
            current_node.remove
            current_node.forth
            current_node.remove
        end

Or does that only remove the current_node?