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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "PSHDEVEL 1" | |
132 | .TH PSHDEVEL 1 "2003-01-02" "perl v5.8.0" "User Contributed Perl Documentation" | |
133 | .SH "NAME" | |
134 | psh \- Developing for Perl Shell | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | Developing for the Perl Shell. | |
138 | .SH "DESCRIPTION" | |
139 | .IX Header "DESCRIPTION" | |
140 | .Sh "\s-1DEBUGGING\s0" | |
141 | .IX Subsection "DEBUGGING" | |
142 | The \fB\-d\fR option puts \fBpsh\fR into \*(L"debugging\*(R" mode, which prints | |
143 | diagnostic output. Note that you can also enter/leave this | |
144 | debugging mode in a running \fBpsh\fR via the \f(CW$Psh::debugging\fR variable. | |
145 | .PP | |
146 | Possible values for \fB\-d\fR/\f(CW$Psh::debugging\fR are either 0 to disable | |
147 | it, 1 to enable all debug messages or a string of characters where | |
148 | each character denotes a certain class of debug messages. | |
149 | .ie n .IP """s"" \- enables printing of information about the chosen strategy for each command" 4 | |
150 | .el .IP "\f(CWs\fR \- enables printing of information about the chosen strategy for each command" 4 | |
151 | .IX Item "s - enables printing of information about the chosen strategy for each command" | |
152 | .PD 0 | |
153 | .ie n .IP """o"" \- enables printing of ""other"" debug info \- info which has not been further categorized" 4 | |
154 | .el .IP "\f(CWo\fR \- enables printing of ``other'' debug info \- info which has not been further categorized" 4 | |
155 | .IX Item "o - enables printing of other debug info - info which has not been further categorized" | |
156 | .ie n .IP """f"" \- enables printing of the rc files read by psh on startup while it is executed and allows easy tracing of problems in these files" 4 | |
157 | .el .IP "\f(CWf\fR \- enables printing of the rc files read by psh on startup while it is executed and allows easy tracing of problems in these files" 4 | |
158 | .IX Item "f - enables printing of the rc files read by psh on startup while it is executed and allows easy tracing of problems in these files" | |
159 | .ie n .IP """i"" \- enables printing of initialization debug info" 4 | |
160 | .el .IP "\f(CWi\fR \- enables printing of initialization debug info" 4 | |
161 | .IX Item "i - enables printing of initialization debug info" | |
162 | .ie n .IP """e"" \- enables printing of otherwise suppressed error messages" 4 | |
163 | .el .IP "\f(CWe\fR \- enables printing of otherwise suppressed error messages" 4 | |
164 | .IX Item "e - enables printing of otherwise suppressed error messages" | |
165 | .ie n .IP """c"" \- enables printing of debug messages for completion" 4 | |
166 | .el .IP "\f(CWc\fR \- enables printing of debug messages for completion" 4 | |
167 | .IX Item "c - enables printing of debug messages for completion" | |
168 | .PD | |
169 | .Sh "\s-1SPEED\s0" | |
170 | .IX Subsection "SPEED" | |
171 | Even though \fBpsh\fR aims to be an interactive shell instead of a scripting | |
172 | environment, speed is important. The main concern here is that startup | |
173 | speed of \fBpsh\fR, which is primarily determined by two factors: | |
174 | .IP "perl startup and module loading" 4 | |
175 | .IX Item "perl startup and module loading" | |
176 | .PD 0 | |
177 | .IP "command processing speed" 4 | |
178 | .IX Item "command processing speed" | |
179 | .PD | |
180 | .PP | |
181 | The startup time on a normal, not to busy, computer should be smaller than | |
182 | one second. To make this possible, keep some simple rules in mind: | |
183 | .ie n .IP "prefer ""require""\fR to \f(CW""use"" whenever possible" 4 | |
184 | .el .IP "prefer \f(CWrequire\fR to \f(CWuse\fR whenever possible" 4 | |
185 | .IX Item "prefer require to use whenever possible" | |
186 | .PD 0 | |
187 | .IP "delay loading modules until they are really needed" 4 | |
188 | .IX Item "delay loading modules until they are really needed" | |
189 | .ie n .IP "let the ""applies"" method of evaluation strategies be as fast as possible" 4 | |
190 | .el .IP "let the \f(CWapplies\fR method of evaluation strategies be as fast as possible" 4 | |
191 | .IX Item "let the applies method of evaluation strategies be as fast as possible" | |
192 | .PD | |
193 | .Sh "BUILT-IN \s-1FUNCTIONS\s0" | |
194 | .IX Subsection "BUILT-IN FUNCTIONS" | |
195 | On startup, \f(CW\*(C`psh\*(C'\fR scans the Psh::Builtins:: namespace and will add | |
196 | the names of all found dynamic loadable builtins to \f(CW%Psh::built_ins\fR. | |
197 | .PP | |
198 | During evaluation of an input line, \f(CW\*(C`psh\*(C'\fR will first check the | |
199 | \&\f(CW%Psh::built_ins\fR variable. If this fails it will try to locate an | |
200 | appropriate built-in function in Psh::Builtins.pm. | |
201 | .PP | |
202 | A dynamical loadable builtin has to be in a file called Builtinname.pm | |
203 | within the Psh::Builtins:: namespace and has at least one subroutine, called | |
204 | \&'bi_builtinname'. Additionally, it may provide a cmpl_builtinname | |
205 | subroutine for a custom completion. Furthermore, a builtin should | |
206 | contain some pod documentation, starting with \*(L"=item * \*(R" and ending | |
207 | with \*(L"=cut\*(R". The builtin will be called with 2 arguments, the first | |
208 | one if the rest of the line while the second one is an array to | |
209 | all the words psh discovered. | |
210 | .PP | |
211 | For a list of the predefined \fBpsh\fR builtins, use the \*(L"help\*(R" command from within \fBpsh\fR. | |
212 | .Sh "\s-1DEFINING\s0 \s-1EVALUATION\s0 \s-1STRATEGIES\s0" | |
213 | .IX Subsection "DEFINING EVALUATION STRATEGIES" | |
214 | Currently empty due to overhaul of strategies | |
215 | .SH "COPYRIGHT" | |
216 | .IX Header "COPYRIGHT" | |
217 | Copyright (C) 1999\-2003 Gregor N. Purdy. All rights reserved. | |
218 | This script is free software. It may be copied or modified according | |
219 | to the same terms as Perl itself. |