Identifiers, methods, classes, etc. Each tag is stored in each line. Ctags is supported by many programming languages. This tool helps the user to search any method or function block to find out how it works. It is very useful to search for any variable in the large project. How ctags can be installed and used with vim editor for navigating the source code of any programming language on Ubuntu are shown in this tutorial.
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Jump to the tag underneath the cursor M-. Say yes when prompted to load the really big tags file. The first command is probably the one you will use most often: it jumps to the definition of the tag function name, structure name, variable name, or pretty much anything.
The second command can be used to search for any tag in the TAGS file, regardless of the file you are currently viewing. Sometimes Etags will find multiple definitions for a given tag; when this is the case, use the third command to jump through the possible definitions until you find the one that you want. Finally, use the fourth command to jump back up in the tag "stack.
Switch to the new buffer C-x o , scroll through the list of definitions to the one that you want, then press Enter to open the file. To switch back to your original buffer and expand it, use C-x o to switch to it, then C-x 1 to expand.
This is mostly a problem for structs struct inode, for instance that are used frequently in the kernel. You should still find Etags useful for jumping to function definitions and less-commonly-used structs. Ctags for Vim appears to do a better job of separating "definitions" from "uses" in its tags file, so this is less of a problem for Vim; for Emacs, there may be other ways to mitigate this problem see this page , for example.
Alternatively, you may wish to use cscope to find function and structure definitions, or just use the third step of the Vim instructions below. Ctags with Vim Note These commands were tested with Vim 7. For Linux 2. These warnings can be ignored.
Vim and Ctags
Combining vim with ctags yields a powerful combination for working with large or unfamiliar codebases. What is ctags? Ctags is a tool that will sift through your code, indexing methods, classes, variables, and other identifiers, storing the index in a tags file. The tags file contains a single tag per line. Depending on command line arguments and the language ctags is run against, a lot of information can be obtained from this index. And afterwards, you can jump right back to where you were working. Installing ctags You can install ctags using a package manager.
ctags - Unix, Linux Command
Etags[ edit ] Emacs comes with two ctags utilities, etags and ctags, which are compiled from the same source code. Etags generates a tag table file for Emacs, while the ctags command is used to create a similar table in a format understood by vi. They have different sets of command line options: For those options which only make sense for vi style tag files produced by the ctags command, etags could not recognize them and would ignore them. Exuberant Ctags[ edit ] Exuberant Ctags, written and maintained by Darren Hiebert , was initially distributed with Vim , but became a separate project upon the release of Vim 6. Exuberant Ctags includes support for over 40 programming languages with the ability to add support for even more using regular expressions.
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