iskm/learnxinyminutes-docs
1
0
Fork 0
mirror of https://github.com/adambard/learnxinyminutes-docs.git synced 2024-12-23 09:41:36 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

[tcl/en] Fix #2569 and also fit to 79 columns width

Browse Source
This commit is contained in:
Samantha McVey 2016-11-16 15:34:24 -08:00
parent ce00d724a1
commit 13369ee56c
No known key found for this signature in database
GPG Key ID: A68DF012C3881D62
1 changed files with 20 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
tcl.html.markdown
View File

@ -57,9 +57,9 @@ lighter that that of Lisp, just gets out of the way.
```tcl
#! /bin/env tclsh
################################################################################
###############################################################################
## 1. Guidelines
################################################################################
###############################################################################
# Tcl is not Bash or C! This needs to be said because standard shell quoting
# habits almost work in Tcl and it is common for people to pick up Tcl and try
@ -72,9 +72,9 @@ lighter that that of Lisp, just gets out of the way.
# are formatted as lists.
################################################################################
###############################################################################
## 2. Syntax
################################################################################
###############################################################################
# Every line is a command. The first word is the name of the command, and
# subsequent words are arguments to the command. Words are delimited by
@ -151,6 +151,8 @@ set greeting "Hello, [set {first name}]"
# To promote the words within a word to individual words of the current
# command, use the expansion operator, "{*}".
```
```tcl
set {*}{name Neo}
# is equivalent to
@ -171,14 +173,15 @@ namespace eval people {
}
#The full name of a variable includes its enclosing namespace(s), delimited by two colons:
# The full name of a variable includes its enclosing namespace(s), delimited by
# two colons:
set greeting "Hello $people::person1::name"
################################################################################
###############################################################################
## 3. A Few Notes
################################################################################
###############################################################################
# All other functionality is implemented via commands. From this point on,
# there is no new syntax. Everything else there is to learn about Tcl is about
@ -192,10 +195,11 @@ set greeting "Hello $people::person1::name"
namespace delete ::
# Because of name resolution behaviour, it's safer to use the "variable" command to
# declare or to assign a value to a namespace. If a variable called "name" already
# exists in the global namespace, using "set" here will assign a value to the global variable
# instead of creating a new variable in the local namespace.
# Because of name resolution behaviour, it's safer to use the "variable"
# command to declare or to assign a value to a namespace. If a variable called
# "name" already exists in the global namespace, using "set" here will assign
# a value to the global variable instead of creating a new variable in the
# local namespace.
namespace eval people {
namespace eval person1 {
variable name Neo
@ -208,9 +212,9 @@ set people::person1::name Neo
################################################################################
###############################################################################
## 4. Commands
################################################################################
###############################################################################
# Math can be done with the "expr" command.
set a 3
@ -294,7 +298,8 @@ while {$i < 10} {
}
# A list is a specially-formatted string. In the simple case, whitespace is sufficient to delimit values
# A list is a specially-formatted string. In the simple case, whitespace is
# sufficient to delimit values
set amounts 10\ 33\ 18
set amount [lindex $amounts 1]
@ -406,7 +411,7 @@ proc set_double {varname value} {
}
#get rid of the built-in "while" command.
# Get rid of the built-in "while" command.
rename ::while {}