diff options
Diffstat (limited to 'doc/library.n')
| -rw-r--r-- | doc/library.n | 56 |
1 files changed, 38 insertions, 18 deletions
diff --git a/doc/library.n b/doc/library.n index f29af8b..98dcb35 100644 --- a/doc/library.n +++ b/doc/library.n @@ -9,14 +9,13 @@ .TH library n "8.0" Tcl "Tcl Built-In Commands" .BS .SH NAME -auto_execok, auto_import, auto_load, auto_mkindex, auto_mkindex_old, auto_qualify, auto_reset, tcl_findLibrary, parray, tcl_endOfWord, tcl_startOfNextWord, tcl_startOfPreviousWord, tcl_wordBreakAfter, tcl_wordBreakBefore \- standard library of Tcl procedures +auto_execok, auto_import, auto_load, auto_mkindex, auto_qualify, auto_reset, tcl_findLibrary, parray, tcl_endOfWord, tcl_startOfNextWord, tcl_startOfPreviousWord, tcl_wordBreakAfter, tcl_wordBreakBefore \- standard library of Tcl procedures .SH SYNOPSIS .nf \fBauto_execok \fIcmd\fR \fBauto_import \fIpattern\fR \fBauto_load \fIcmd\fR \fBauto_mkindex \fIdir pattern pattern ...\fR -\fBauto_mkindex_old \fIdir pattern pattern ...\fR \fBauto_qualify \fIcommand namespace\fR \fBauto_reset\fR \fBtcl_findLibrary \fIbasename version patch initScript enVarName varName\fR @@ -39,14 +38,16 @@ its own library of support procedures as well; the location of this library is normally given by the value of the \fB$\fIapp\fB_library\fR global variable, where \fIapp\fR is the name of the application. For example, the location of the Tk library is kept in the variable -\fB$tk_library\fR. +\fBtk_library\fR. .PP To access the procedures in the Tcl library, an application should source the file \fBinit.tcl\fR in the library, for example with the Tcl command +.PP .CS \fBsource [file join [info library] init.tcl]\fR .CE +.PP If the library procedure \fBTcl_Init\fR is invoked from an application's \fBTcl_AppInit\fR procedure, this happens automatically. The code in \fBinit.tcl\fR will define the \fBunknown\fR procedure @@ -83,8 +84,8 @@ matching rules of \fBnamespace import\fR. This command attempts to load the definition for a Tcl command named \fIcmd\fR. To do this, it searches an \fIauto-load path\fR, which is a list of one or more directories. The auto-load path is given by the -global variable \fB$auto_path\fR if it exists. If there is no -\fB$auto_path\fR variable, then the TCLLIBPATH environment variable is +global variable \fBauto_path\fR if it exists. If there is no +\fBauto_path\fR variable, then the TCLLIBPATH environment variable is used, if it exists. Otherwise the auto-load path consists of just the Tcl library directory. Within each directory in the auto-load path there must be a file \fBtclIndex\fR that describes one or more @@ -105,6 +106,7 @@ cached index information may be deleted with the command reload the index database from disk. .TP \fBauto_mkindex \fIdir pattern pattern ...\fR +. Generates an index suitable for use by \fBauto_load\fR. The command searches \fIdir\fR for all files whose names match any of the \fIpattern\fR arguments (matching is done with the \fBglob\fR @@ -113,10 +115,11 @@ in all the matching files, and stores the index information in a file named \fBtclIndex\fR in \fIdir\fR. If no pattern is given a pattern of \fB*.tcl\fR will be assumed. For example, the command .RS +.PP .CS \fBauto_mkindex foo *.tcl\fR .CE -.LP +.PP will read all the \fB.tcl\fR files in subdirectory \fBfoo\fR and generate a new index file \fBfoo/tclIndex\fR. .PP @@ -127,21 +130,25 @@ auto_mkindex_parser package to register other commands that can contribute to the auto_load index. You will have to read through auto.tcl to see how this works. .PP -\fBAuto_mkindex_old\fR parses the Tcl scripts in a relatively -unsophisticated way: if any line contains the word \fBproc\fR +\fBAuto_mkindex_old\fR +(which has the same syntax as \fBauto_mkindex\fR) +parses the Tcl scripts in a relatively +unsophisticated way: if any line contains the word +.QW \fBproc\fR as its first characters then it is assumed to be a procedure definition and the next word of the line is taken as the procedure's name. -Procedure definitions that do not appear in this way (e.g. they +Procedure definitions that do not appear in this way (e.g.\ they have spaces before the \fBproc\fR) will not be indexed. If your script contains .QW dangerous code, such as global initialization code or procedure names with special characters like \fB$\fR, -\fB*\fR, \fB[\fR or \fB]\fR, you are safer using auto_mkindex_old. +\fB*\fR, \fB[\fR or \fB]\fR, you are safer using \fBauto_mkindex_old\fR. .RE .TP \fBauto_reset\fR +. Destroys all the information cached by \fBauto_execok\fR and \fBauto_load\fR. This information will be re-read from disk the next time it is needed. \fBAuto_reset\fR also deletes any procedures @@ -192,7 +199,7 @@ relative to the executable file in a parallel build tree. \fBparray \fIarrayName\fR Prints on standard output the names and values of all the elements in the array \fIarrayName\fR. -\fBArrayName\fR must be an array accessible to the caller of \fBparray\fR. +\fIArrayName\fR must be an array accessible to the caller of \fBparray\fR. It may be either local or global. .TP \fBtcl_endOfWord \fIstr start\fR @@ -234,7 +241,9 @@ boundary. .SH "VARIABLES" .PP The following global variables are defined or used by the procedures in -the Tcl library: +the Tcl library. They fall into two broad classes, handling unknown +commands and packages, and determining what are words. +.SS "AUTOLOADING AND PACKAGE MANAGEMENT VARIABLES" .TP \fBauto_execs\fR Used by \fBauto_execok\fR to record information about whether @@ -253,13 +262,17 @@ If set to any value, then \fBunknown\fR will not attempt to auto-load any commands. .TP \fBauto_path\fR +. If set, then it must contain a valid Tcl list giving directories to -search during auto-load operations. +search during auto-load operations (including for package index +files when using the default \fBpackage unknown\fR handler). This variable is initialized during startup to contain, in order: -the directories listed in the TCLLIBPATH environment variable, -the directory named by the $tcl_library variable, -the parent directory of $tcl_library, -the directories listed in the $tcl_pkgPath variable. +the directories listed in the \fBTCLLIBPATH\fR environment variable, +the directory named by the \fBtcl_library\fR global variable, +the parent directory of \fBtcl_library\fR, +the directories listed in the \fBtcl_pkgPath\fR variable. +Additional locations to look for files and package indices should +normally be added to this variable using \fBlappend\fR. .TP \fBenv(TCL_LIBRARY)\fR If set, then it specifies the location of the directory containing @@ -275,6 +288,10 @@ Tcl format, using .QW / as the path separator, regardless of platform. This variable is only used when initializing the \fBauto_path\fR variable. +.SS "WORD BOUNDARY DETERMINATION VARIABLES" +These variables are only used in the \fBtcl_endOfWord\fR, +\fBtcl_startOfNextWord\fR, \fBtcl_startOfPreviousWord\fR, +\fBtcl_wordBreakAfter\fR, and \fBtcl_wordBreakBefore\fR commands. .TP \fBtcl_nonwordchars\fR This variable contains a regular expression that is used by routines @@ -293,6 +310,9 @@ considered to be a word character. On Windows platforms, words are comprised of any character that is not a space, tab, or newline. Under Unix, words are comprised of numbers, letters or underscores. .SH "SEE ALSO" -info(n), re_syntax(n) +env(n), info(n), re_syntax(n) .SH KEYWORDS auto-exec, auto-load, library, unknown, word, whitespace +'\"Local Variables: +'\"mode: nroff +'\"End: |