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| author | johannst <johannst@users.noreply.github.com> | 2024-05-01 17:39:45 +0000 |
|---|---|---|
| committer | johannst <johannst@users.noreply.github.com> | 2024-05-01 17:39:45 +0000 |
| commit | 21a13652df728c9571f899caf4949d5d46f49db7 (patch) | |
| tree | dcd723453f6405c53a162da4c95896f5768f13d2 /shells/fish.html | |
| parent | 269caa8ae18eb33e1286e4c21d434ea07228a619 (diff) | |
| download | notes-21a13652df728c9571f899caf4949d5d46f49db7.tar.gz notes-21a13652df728c9571f899caf4949d5d46f49db7.zip | |
deploy: 7ca41565c4e70b212cb88a4d18c18fa35768df6d
Diffstat (limited to 'shells/fish.html')
| -rw-r--r-- | shells/fish.html | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/shells/fish.html b/shells/fish.html new file mode 100644 index 0000000..f488597 --- /dev/null +++ b/shells/fish.html @@ -0,0 +1,469 @@ +<!DOCTYPE HTML> +<html lang="en" class="light" dir="ltr"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>fish - Notes</title> + + + <!-- Custom HTML head --> + + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="theme-color" content="#ffffff"> + + <link rel="icon" href="../favicon.svg"> + <link rel="shortcut icon" href="../favicon.png"> + <link rel="stylesheet" href="../css/variables.css"> + <link rel="stylesheet" href="../css/general.css"> + <link rel="stylesheet" href="../css/chrome.css"> + <link rel="stylesheet" href="../css/print.css" media="print"> + + <!-- Fonts --> + <link rel="stylesheet" href="../FontAwesome/css/font-awesome.css"> + <link rel="stylesheet" href="../fonts/fonts.css"> + + <!-- Highlight.js Stylesheets --> + <link rel="stylesheet" href="../highlight.css"> + <link rel="stylesheet" href="../tomorrow-night.css"> + <link rel="stylesheet" href="../ayu-highlight.css"> + + <!-- Custom theme stylesheets --> + + </head> + <body class="sidebar-visible no-js"> + <div id="body-container"> + <!-- Provide site root to javascript --> + <script> + var path_to_root = "../"; + var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light"; + </script> + + <!-- Work around some values being stored in localStorage wrapped in quotes --> + <script> + try { + var theme = localStorage.getItem('mdbook-theme'); + var sidebar = localStorage.getItem('mdbook-sidebar'); + + if (theme.startsWith('"') && theme.endsWith('"')) { + localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1)); + } + + if (sidebar.startsWith('"') && sidebar.endsWith('"')) { + localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1)); + } + } catch (e) { } + </script> + + <!-- Set the theme before any content is loaded, prevents flash --> + <script> + var theme; + try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } + if (theme === null || theme === undefined) { theme = default_theme; } + var html = document.querySelector('html'); + html.classList.remove('light') + html.classList.add(theme); + var body = document.querySelector('body'); + body.classList.remove('no-js') + body.classList.add('js'); + </script> + + <input type="checkbox" id="sidebar-toggle-anchor" class="hidden"> + + <!-- Hide / unhide sidebar before it is displayed --> + <script> + var body = document.querySelector('body'); + var sidebar = null; + var sidebar_toggle = document.getElementById("sidebar-toggle-anchor"); + if (document.body.clientWidth >= 1080) { + try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { } + sidebar = sidebar || 'visible'; + } else { + sidebar = 'hidden'; + } + sidebar_toggle.checked = sidebar === 'visible'; + body.classList.remove('sidebar-visible'); + body.classList.add("sidebar-" + sidebar); + </script> + + <nav id="sidebar" class="sidebar" aria-label="Table of contents"> + <div class="sidebar-scrollbox"> + <ol class="chapter"><li class="chapter-item expanded affix "><a href="../intro.html">Introduction</a></li><li class="chapter-item expanded "><a href="../shells/index.html"><strong aria-hidden="true">1.</strong> Shells</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../shells/zsh.html"><strong aria-hidden="true">1.1.</strong> zsh</a></li><li class="chapter-item expanded "><a href="../shells/bash.html"><strong aria-hidden="true">1.2.</strong> bash</a></li><li class="chapter-item expanded "><a href="../shells/fish.html" class="active"><strong aria-hidden="true">1.3.</strong> fish</a></li></ol></li><li class="chapter-item expanded "><a href="../cli/index.html"><strong aria-hidden="true">2.</strong> CLI foo</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../cli/awk.html"><strong aria-hidden="true">2.1.</strong> awk</a></li><li class="chapter-item expanded "><a href="../cli/sed.html"><strong aria-hidden="true">2.2.</strong> sed</a></li><li class="chapter-item expanded "><a href="../cli/column.html"><strong aria-hidden="true">2.3.</strong> column</a></li><li class="chapter-item expanded "><a href="../cli/sort.html"><strong aria-hidden="true">2.4.</strong> sort</a></li><li class="chapter-item expanded "><a href="../cli/tr.html"><strong aria-hidden="true">2.5.</strong> tr</a></li></ol></li><li class="chapter-item expanded "><a href="../tools/index.html"><strong aria-hidden="true">3.</strong> Tools</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../tools/tmux.html"><strong aria-hidden="true">3.1.</strong> tmux</a></li><li class="chapter-item expanded "><a href="../tools/emacs.html"><strong aria-hidden="true">3.2.</strong> emacs</a></li><li class="chapter-item expanded "><a href="../tools/gpg.html"><strong aria-hidden="true">3.3.</strong> gpg</a></li><li class="chapter-item expanded "><a href="../tools/radare2.html"><strong aria-hidden="true">3.4.</strong> radare2</a></li><li class="chapter-item expanded "><a href="../tools/qemu.html"><strong aria-hidden="true">3.5.</strong> qemu</a></li><li class="chapter-item expanded "><a href="../tools/pacman.html"><strong aria-hidden="true">3.6.</strong> pacman</a></li><li class="chapter-item expanded "><a href="../tools/dot.html"><strong aria-hidden="true">3.7.</strong> dot</a></li><li class="chapter-item expanded "><a href="../tools/ffmpeg.html"><strong aria-hidden="true">3.8.</strong> ffmpeg</a></li><li class="chapter-item expanded "><a href="../tools/gnuplot.html"><strong aria-hidden="true">3.9.</strong> gnuplot</a></li><li class="chapter-item expanded "><a href="../tools/restic.html"><strong aria-hidden="true">3.10.</strong> restic</a></li></ol></li><li class="chapter-item expanded "><a href="../monitor/index.html"><strong aria-hidden="true">4.</strong> Resource analysis & monitor</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../monitor/lsof.html"><strong aria-hidden="true">4.1.</strong> lsof</a></li><li class="chapter-item expanded "><a href="../monitor/pidstat.html"><strong aria-hidden="true">4.2.</strong> pidstat</a></li><li class="chapter-item expanded "><a href="../monitor/pgrep.html"><strong aria-hidden="true">4.3.</strong> pgrep</a></li><li class="chapter-item expanded "><a href="../monitor/ps.html"><strong aria-hidden="true">4.4.</strong> ps</a></li><li class="chapter-item expanded "><a href="../monitor/pmap.html"><strong aria-hidden="true">4.5.</strong> pmap</a></li><li class="chapter-item expanded "><a href="../monitor/pstack.html"><strong aria-hidden="true">4.6.</strong> pstack</a></li></ol></li><li class="chapter-item expanded "><a href="../trace_profile/index.html"><strong aria-hidden="true">5.</strong> Trace and Profile</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../trace_profile/time.html"><strong aria-hidden="true">5.1.</strong> time</a></li><li class="chapter-item expanded "><a href="../trace_profile/strace.html"><strong aria-hidden="true">5.2.</strong> strace</a></li><li class="chapter-item expanded "><a href="../trace_profile/ltrace.html"><strong aria-hidden="true">5.3.</strong> ltrace</a></li><li class="chapter-item expanded "><a href="../trace_profile/perf.html"><strong aria-hidden="true">5.4.</strong> perf</a></li><li class="chapter-item expanded "><a href="../trace_profile/oprofile.html"><strong aria-hidden="true">5.5.</strong> OProfile</a></li><li class="chapter-item expanded "><a href="../trace_profile/callgrind.html"><strong aria-hidden="true">5.6.</strong> callgrind</a></li></ol></li><li class="chapter-item expanded "><a href="../debug/index.html"><strong aria-hidden="true">6.</strong> Debug</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../debug/gdb.html"><strong aria-hidden="true">6.1.</strong> gdb</a></li><li class="chapter-item expanded "><a href="../debug/gdbserver.html"><strong aria-hidden="true">6.2.</strong> gdbserver</a></li></ol></li><li class="chapter-item expanded "><a href="../binary/index.html"><strong aria-hidden="true">7.</strong> Binary</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../binary/od.html"><strong aria-hidden="true">7.1.</strong> od</a></li><li class="chapter-item expanded "><a href="../binary/xxd.html"><strong aria-hidden="true">7.2.</strong> xxd</a></li><li class="chapter-item expanded "><a href="../binary/readelf.html"><strong aria-hidden="true">7.3.</strong> readelf</a></li><li class="chapter-item expanded "><a href="../binary/objdump.html"><strong aria-hidden="true">7.4.</strong> objdump</a></li><li class="chapter-item expanded "><a href="../binary/nm.html"><strong aria-hidden="true">7.5.</strong> nm</a></li></ol></li><li class="chapter-item expanded "><a href="../development/index.html"><strong aria-hidden="true">8.</strong> Development</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../development/c++filt.html"><strong aria-hidden="true">8.1.</strong> c++filt</a></li><li class="chapter-item expanded "><a href="../development/c++.html"><strong aria-hidden="true">8.2.</strong> c++</a></li><li class="chapter-item expanded "><a href="../development/glibc.html"><strong aria-hidden="true">8.3.</strong> glibc</a></li><li class="chapter-item expanded "><a href="../development/gcc.html"><strong aria-hidden="true">8.4.</strong> gcc</a></li><li class="chapter-item expanded "><a href="../development/git.html"><strong aria-hidden="true">8.5.</strong> git</a></li><li class="chapter-item expanded "><a href="../development/cmake.html"><strong aria-hidden="true">8.6.</strong> cmake</a></li><li class="chapter-item expanded "><a href="../development/make.html"><strong aria-hidden="true">8.7.</strong> make</a></li><li class="chapter-item expanded "><a href="../development/ld.so.html"><strong aria-hidden="true">8.8.</strong> ld.so</a></li><li class="chapter-item expanded "><a href="../development/symbolver.html"><strong aria-hidden="true">8.9.</strong> symbol versioning</a></li><li class="chapter-item expanded "><a href="../development/python.html"><strong aria-hidden="true">8.10.</strong> python</a></li><li class="chapter-item expanded "><a href="../development/gcov.html"><strong aria-hidden="true">8.11.</strong> gcov</a></li><li class="chapter-item expanded "><a href="../development/pgo.html"><strong aria-hidden="true">8.12.</strong> pgo</a></li></ol></li><li class="chapter-item expanded "><a href="../linux/index.html"><strong aria-hidden="true">9.</strong> Linux</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../linux/systemd.html"><strong aria-hidden="true">9.1.</strong> systemd</a></li><li class="chapter-item expanded "><a href="../linux/coredump.html"><strong aria-hidden="true">9.2.</strong> coredump</a></li><li class="chapter-item expanded "><a href="../linux/ptrace_scope.html"><strong aria-hidden="true">9.3.</strong> ptrace_scope</a></li><li class="chapter-item expanded "><a href="../linux/cryptsetup.html"><strong aria-hidden="true">9.4.</strong> cryptsetup</a></li><li class="chapter-item expanded "><a href="../linux/swap.html"><strong aria-hidden="true">9.5.</strong> swap</a></li><li class="chapter-item expanded "><a href="../linux/input.html"><strong aria-hidden="true">9.6.</strong> input</a></li><li class="chapter-item expanded "><a href="../linux/acl.html"><strong aria-hidden="true">9.7.</strong> acl</a></li><li class="chapter-item expanded "><a href="../linux/zfs.html"><strong aria-hidden="true">9.8.</strong> zfs</a></li></ol></li><li class="chapter-item expanded "><a href="../network/index.html"><strong aria-hidden="true">10.</strong> Network</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../network/ss.html"><strong aria-hidden="true">10.1.</strong> ss</a></li><li class="chapter-item expanded "><a href="../network/tcpdump.html"><strong aria-hidden="true">10.2.</strong> tcpdump</a></li><li class="chapter-item expanded "><a href="../network/tshark.html"><strong aria-hidden="true">10.3.</strong> tshark</a></li><li class="chapter-item expanded "><a href="../network/firewall-cmd.html"><strong aria-hidden="true">10.4.</strong> firewall-cmd</a></li><li class="chapter-item expanded "><a href="../network/nftables.html"><strong aria-hidden="true">10.5.</strong> nftables</a></li></ol></li><li class="chapter-item expanded "><a href="../web/index.html"><strong aria-hidden="true">11.</strong> Web</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../web/html.html"><strong aria-hidden="true">11.1.</strong> html</a></li><li class="chapter-item expanded "><a href="../web/css.html"><strong aria-hidden="true">11.2.</strong> css</a></li><li class="chapter-item expanded "><a href="../web/chartjs.html"><strong aria-hidden="true">11.3.</strong> chartjs</a></li></ol></li><li class="chapter-item expanded "><a href="../arch/index.html"><strong aria-hidden="true">12.</strong> Arch</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../arch/x86_64.html"><strong aria-hidden="true">12.1.</strong> x86_64</a></li><li class="chapter-item expanded "><a href="../arch/armv8.html"><strong aria-hidden="true">12.2.</strong> armv8</a></li><li class="chapter-item expanded "><a href="../arch/arm64.html"><strong aria-hidden="true">12.3.</strong> arm64</a></li><li class="chapter-item expanded "><a href="../arch/armv7.html"><strong aria-hidden="true">12.4.</strong> armv7</a></li><li class="chapter-item expanded "><a href="../arch/riscv.html"><strong aria-hidden="true">12.5.</strong> riscv</a></li></ol></li></ol> + </div> + <div id="sidebar-resize-handle" class="sidebar-resize-handle"> + <div class="sidebar-resize-indicator"></div> + </div> + </nav> + + <!-- Track and set sidebar scroll position --> + <script> + var sidebarScrollbox = document.querySelector('#sidebar .sidebar-scrollbox'); + sidebarScrollbox.addEventListener('click', function(e) { + if (e.target.tagName === 'A') { + sessionStorage.setItem('sidebar-scroll', sidebarScrollbox.scrollTop); + } + }, { passive: true }); + var sidebarScrollTop = sessionStorage.getItem('sidebar-scroll'); + sessionStorage.removeItem('sidebar-scroll'); + if (sidebarScrollTop) { + // preserve sidebar scroll position when navigating via links within sidebar + sidebarScrollbox.scrollTop = sidebarScrollTop; + } else { + // scroll sidebar to current active section when navigating via "next/previous chapter" buttons + var activeSection = document.querySelector('#sidebar .active'); + if (activeSection) { + activeSection.scrollIntoView({ block: 'center' }); + } + } + </script> + + <div id="page-wrapper" class="page-wrapper"> + + <div class="page"> + <div id="menu-bar-hover-placeholder"></div> + <div id="menu-bar" class="menu-bar sticky"> + <div class="left-buttons"> + <label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar"> + <i class="fa fa-bars"></i> + </label> + <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list"> + <i class="fa fa-paint-brush"></i> + </button> + <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu"> + <li role="none"><button role="menuitem" class="theme" id="light">Light</button></li> + <li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li> + <li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li> + <li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li> + <li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li> + </ul> + <button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> + <i class="fa fa-search"></i> + </button> + </div> + + <h1 class="menu-title">Notes</h1> + + <div class="right-buttons"> + <a href="../print.html" title="Print this book" aria-label="Print this book"> + <i id="print-button" class="fa fa-print"></i> + </a> + <a href="https://github.com/johannst/notes" title="Git repository" aria-label="Git repository"> + <i id="git-repository-button" class="fa fa-github"></i> + </a> + + </div> + </div> + + <div id="search-wrapper" class="hidden"> + <form id="searchbar-outer" class="searchbar-outer"> + <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> + </form> + <div id="searchresults-outer" class="searchresults-outer hidden"> + <div id="searchresults-header" class="searchresults-header"></div> + <ul id="searchresults"> + </ul> + </div> + </div> + + <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> + <script> + document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); + document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); + Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { + link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); + }); + </script> + + <div id="content" class="content"> + <main> + <h1 id="fish1"><a class="header" href="#fish1">fish(1)</a></h1> +<h2 id="quick-info"><a class="header" href="#quick-info">Quick Info</a></h2> +<p>Fish initialization file <code>~/.config/fish/config.fish</code></p> +<p>Switch between different key bindings:</p> +<ul> +<li><code>fish_default_key_bindings</code> to use default key bindings</li> +<li><code>fish_vi_key_bindings</code> to use vi key bindings</li> +</ul> +<h2 id="variables"><a class="header" href="#variables">Variables</a></h2> +<p>Available scopes</p> +<ul> +<li><code>local</code> variable local to a block</li> +<li><code>global</code> variable global to shell instance</li> +<li><code>universal</code> variable universal to all shell instances + preserved across +shell restart</li> +</ul> +<h3 id="setunset-variables"><a class="header" href="#setunset-variables">Set/Unset Variables</a></h3> +<pre><code class="language-text">set <name> [<values>] + -l local scope + -g global scope + -U universal scope + -e erase variable + -S show verbose info + -x export to ENV + -u unexport from ENV +</code></pre> +<h3 id="special-variables-ref"><a class="header" href="#special-variables-ref">Special Variables <a href="https://fishshell.com/docs/current/language.html#special-variables">ref</a></a></h3> +<pre><code class="language-sh">$status # exit code of last command +$pipestatus # list of exit codes of pipe chain + +$fish_pid # pid of parent fish shell ($$ in bash) +$last_pid # pid of last started process ($! in bash) + +$CMD_DURATION # runtime of last command in ms +</code></pre> +<h3 id="lists"><a class="header" href="#lists">Lists</a></h3> +<p>In <code>fish</code> all variables are lists (start with index <code>1</code>, but lists can't +contain lists.</p> +<pre><code class="language-sh">set foo a b c d + +echo $foo[1] # a +echo $foo[-1] # d +echo $foo[2..3] # b c +echo $foo[1 3] # a c +</code></pre> +<p><code>$</code> can be seen as dereference operator.</p> +<pre><code class="language-sh">set foo a; set a 1337 +echo $$foo # outputs 1337 +</code></pre> +<p>Cartesian product.</p> +<pre><code class="language-sh">echo file.{h,cc} +# file.h file.cc + +echo {a,b}{1,2} +# a1 b1 a2 b2 +</code></pre> +<h4 id="path-ref"><a class="header" href="#path-ref"><code>*PATH</code> <a href="https://fishshell.com/docs/current/language.html#path-variables">ref</a></a></h4> +<p>Lists ending with <code>PATH</code> are automatically split at <code>:</code> when used and joined +with <code>:</code> when quoted or exported to the environment.</p> +<pre><code class="language-sh">set -x BLA_PATH a:b:c:d +echo $BLA_PATH # a b c d +echo "$BLA_PATH" # a:b:c:d (quoted) +env | grep BLA_PATH # BLA_PATH=a:b:c:d (env) + +set FOO_PATH x y z +echo $FOO_PATH # x y z +echo "$FOO_PATH" # x:y:z +</code></pre> +<h2 id="command-handling"><a class="header" href="#command-handling">Command Handling</a></h2> +<pre><code class="language-sh"># sub-commands are not run in quotes +echo "ls output: "(ls) +</code></pre> +<h3 id="io-redirection"><a class="header" href="#io-redirection">I/O redirection</a></h3> +<pre><code class="language-sh"># 'noclobber', fail if 'log' already exists +echo foo >? log +</code></pre> +<h3 id="process-substitution"><a class="header" href="#process-substitution">Process substitution</a></h3> +<p>Redirect output of multiple processes. Same as <code><(..)</code> in bash.</p> +<pre><code class="language-sh">diff (sort a | psub) (sort b | psub) +</code></pre> +<h2 id="control-flow"><a class="header" href="#control-flow">Control Flow</a></h2> +<h3 id="if--else"><a class="header" href="#if--else"><code>if</code> / <code>else</code></a></h3> +<pre><code class="language-sh">if grep foo bar + # do sth +else if grep foobar bar + # do sth else +else + # do sth else +end +</code></pre> +<h3 id="switch"><a class="header" href="#switch"><code>switch</code></a></h3> +<pre><code class="language-sh">switch (echo foo) +case 'foo*' + # do start with foo +case bar dudel + # do bar and dudel +case '*' + # do else +end +</code></pre> +<h3 id="while-loop"><a class="header" href="#while-loop"><code>while</code> Loop</a></h3> +<pre><code class="language-sh">while true + echo foo +end +</code></pre> +<h3 id="for-loop"><a class="header" href="#for-loop"><code>for</code> Loop</a></h3> +<pre><code class="language-sh">for f in (ls) + echo $f +end +</code></pre> +<h2 id="functions"><a class="header" href="#functions">Functions</a></h2> +<p>Function arguments are passed via <code>$argv</code> list.</p> +<pre><code class="language-sh">function fn_foo + echo $argv +end +</code></pre> +<h3 id="autoloading"><a class="header" href="#autoloading">Autoloading</a></h3> +<p>When running a command fish attempts to autoload a function. The shell looks +for <code><cmd>.fish</code> in the locations defined by <code>$fish_function_path</code> and loads +the function lazily if found.</p> +<p>This is the preferred way over monolithically defining all functions in a +startup script.</p> +<h3 id="helper"><a class="header" href="#helper">Helper</a></h3> +<pre><code class="language-sh">functions # list al functions +functions foo # describe function 'foo' +functions -e foo # erase function 'foo' + +funced foo # edit function 'foo' + # '-e vim' to edit in vim +</code></pre> +<h3 id="argument-parsing-and-completion"><a class="header" href="#argument-parsing-and-completion">Argument parsing and completion</a></h3> +<p><code>argparse</code> puts options into variables of name <code>_flag_NAME</code>.</p> +<p>References:</p> +<ul> +<li><a href="https://fishshell.com/docs/current/language.html#argument-handling">Argument Handling</a></li> +<li><a href="https://fishshell.com/docs/current/cmds/argparse.html"><code>argparse</code></a></li> +<li><a href="https://fishshell.com/docs/current/completions.html">Writing your own completions</a></li> +<li><a href="https://fishshell.com/docs/current/cmds/complete.html"><code>complete</code></a></li> +</ul> +<pre><code class="language-sh">function moose --d "my moose fn" + # h/help : short / long option (boolean) + # color : only long option (boolean) + # u/user= : option with required argument, only last specified is taken + # f/file+= : option with required argument, can be specified multiple times + # + argparse h/help color= u/user= f/file=+ -- $argv + or return + + if set -ql _flag_help + echo "usage ..." + return 0 + end + + set -ql _flag_file + and echo "file=$_flag_file | cnt:" (count $_flag_file) + + set -ql _flag_color + and echo "color=$_flag_color" + + set -ql _flag_user + and echo "user=$_flag_user" +end + +# Delete all previous defined completions for 'moose'. +complete -c moose -e + +# Don't complete files for command. +complete -c moose --no-files + +# Help completion. +# -n specifies a conditions. The completion is only active if the command +# returns 0. +complete -c moose -s h -l help -n "not __fish_contains_opt -s h help" \ + --description "Print usage help and exit" + +# File completion. +# -F force complete files (overwrite --no-files). +# -r requires argument. +complete -c moose -s f -l file -F -r \ + --description "Specify file (can be passed multiple times)" + +# Color completion. +# -a options for completion. +# -x short for -r and --no-files (-f) +complete -c moose -x -l color -a "red blue" \ + --description "Specify a color." + +# User completion. +# -a options for completion. Call a function to generate arguments. +complete -c moose -x -s u -l user -a "(__fish_complete_users)" \ + --description "Specify a user" +</code></pre> +<h2 id="prompt"><a class="header" href="#prompt">Prompt</a></h2> +<p>The prompt is defined by the output of the <code>fish_prompt</code> function.</p> +<pre><code class="language-sh">function fish_prompt + set -l cmd_ret + echo "> "(pwd) $cmd_ret" " +end +</code></pre> +<blockquote> +<p>Use <code>set_color</code> to manipulate terminal colors and <code>set_color -c</code> to print the +current colors.</p> +</blockquote> +<h2 id="useful-builtins"><a class="header" href="#useful-builtins">Useful Builtins</a></h2> +<p>List all builtins with <code>builtins -n</code>.</p> +<pre><code class="language-sh"># history +history search <str> # search history for <str> +history merge # merge histories from fish sessions + +# list +count $var # count elements in list + +contains /bin $PATH # return 0 (true) 1 (false) +contains -i /bin $PATH # additionally print index on stdout + +# string +string split SEP STRING + +# math +math -b hex 4096 # output dec as hex +math 0x1000 # output hex as dec +math "log2(1024)" # call functions +math -s0 7/3 # integer division (by default float) + +# status +status -f # abs path of current file +</code></pre> +<h2 id="keymaps"><a class="header" href="#keymaps">Keymaps</a></h2> +<pre><code class="language-text"> Shift-Tab .............. tab-completion with search + Alt-Up / Alt-Down ...... search history with token under the cursor + Alt-l .................. list content of dir under cursor + Alt-p .................. append '2>&1 | less;' to current cmdline + Alt-Left / Alt - Right . prevd / nextd, walk dir history +</code></pre> +<h2 id="debug"><a class="header" href="#debug">Debug</a></h2> +<pre><code class="language-text"> status print-stack-trace .. prints function stacktrace (can be used in scripts) + breakpoint ................ halt script execution and gives shell (C-d | exit + to continue) +</code></pre> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + <a rel="prev" href="../shells/bash.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + <a rel="next prefetch" href="../cli/index.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + <a rel="prev" href="../shells/bash.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + <a rel="next prefetch" href="../cli/index.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + </nav> + + </div> + + + + + <script> + window.playground_copyable = true; + </script> + + + <script src="../elasticlunr.min.js"></script> + <script src="../mark.min.js"></script> + <script src="../searcher.js"></script> + + <script src="../clipboard.min.js"></script> + <script src="../highlight.js"></script> + <script src="../book.js"></script> + + <!-- Custom JS scripts --> + + + </div> + </body> +</html> |