diff --git a/.config/fish/abbreviations.fish b/.config/fish/abbreviations.fish
new file mode 100644
index 00000000..9cddca40
--- /dev/null
+++ b/.config/fish/abbreviations.fish
@@ -0,0 +1,4 @@
+abbr -a b --function projectdo_build
+abbr -a r --function projectdo_run
+abbr -a t --function projectdo_test
+abbr -a p --function projectdo_tool
\ No newline at end of file
diff --git a/.config/fish/completions/projectdo.fish b/.config/fish/completions/projectdo.fish
new file mode 100644
index 00000000..41413b38
--- /dev/null
+++ b/.config/fish/completions/projectdo.fish
@@ -0,0 +1,23 @@
+complete -c projectdo --no-files
+
+set -l commands build run test tool
+
+# Options
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -s h -l help -d 'Display usage information'
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -s d -l 'dry-run' -d 'Do not execute any commands with side-effects'
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -s q -l quiet -d 'Do not print commands before execution'
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -s v -l version -d 'Dsiplay the version'
+
+# Actions
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -a build -d 'Build the current project'
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -a run -d 'Run the current project'
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -a test -d 'Test the current project'
+complete -c projectdo -n "not __fish_seen_subcommand_from $commands" \
+    -a tool -d 'Invoke the tool corresponding to the current project'
diff --git a/.config/fish/config.fish b/.config/fish/config.fish
index 848664a7..d3160dcd 100644
--- a/.config/fish/config.fish
+++ b/.config/fish/config.fish
@@ -1,5 +1,6 @@
 source ~/.config/fish/variables.fish
 source ~/.config/fish/keybinds.fish
+source ~/.config/fish/abbreviations.fish
 
 if status is-interactive
     atuin init fish | source
@@ -10,4 +11,4 @@ end
 starship init fish | source
 zoxide init fish | source
 
-alias cd='z' # Couldn't create it as a function because of zoxide init
+alias cd='z' # Couldn't create it as a function because of zoxide init
\ No newline at end of file
diff --git a/.config/fish/fish_plugins b/.config/fish/fish_plugins
index 9ce2b051..92c97b30 100644
--- a/.config/fish/fish_plugins
+++ b/.config/fish/fish_plugins
@@ -5,3 +5,4 @@ patrickf1/fzf.fish
 wfxr/forgit
 danhper/fish-ssh-agent
 gazorby/fish-abbreviation-tips
+paldepind/projectdo
diff --git a/.config/fish/fish_variables b/.config/fish/fish_variables
index 0e7c767e..324e3421 100644
--- a/.config/fish/fish_variables
+++ b/.config/fish/fish_variables
@@ -13,16 +13,17 @@ SETUVAR --export XDG_CACHE_HOME:/home/matt/\x2ecache
 SETUVAR --export XDG_CONFIG_HOME:/home/matt/\x2econfig
 SETUVAR --export XDG_DATA_HOME:/home/matt/\x2elocal/share
 SETUVAR --export XDG_SCRIPT_HOME:/home/matt/\x2elocal/script
-SETUVAR --export __ABBR_TIPS_KEYS:a__bruh\x1ea__cat\x1ea__cd\x1ea__clock\x1ea__codeinfo\x1ea__disks\x1ea__dots\x1ea__dsize\x1ea__ea\x1ea__ef\x1ea__eg\x1ea__ev\x1ea__f\x1ea__fetch\x1ea__files\x1ea__fsend\x1ea__ga\x1ea__gbd\x1ea__gbl\x1ea__gcb\x1ea__gcf\x1ea__gclean\x1ea__gco\x1ea__gcp\x1ea__gct\x1ea__gd\x1ea__gfetch\x1ea__gfu\x1ea__gi\x1ea__glo\x1ea__gpt\x1ea__grb\x1ea__grc\x1ea__grh\x1ea__gsp\x1ea__gss\x1ea__h\x1ea__info\x1ea__install\x1ea__ip\x1ea__l\x1ea__ld\x1ea__ldh\x1ea__lg\x1ea__lh\x1ea__ls\x1ea__lsh\x1ea__lt\x1ea__lth\x1ea__matrix\x1ea__pages\x1ea__q\x1ea__svn\x1ea__sysproc\x1ea__uninstall\x1ea__update\x1ea__vi\x1ea__vim\x1ea__yP\x1ea__ya\x1ea__yarn\x1ea__yc\x1ea__ym\x1ea__yp\x1ea__yst\x1ea__ysw\x1ea__z\x1ea__zi
-SETUVAR --export __ABBR_TIPS_VALUES:genact\x20\x2ds\x204\x1ebat\x1ez\x1etty\x2dclock\x20\x2dsbc\x1escc\x20\x2e/\x1eduf\x1eyadm\x20enter\x20lazygit\x1edua\x20i\x1envim\x20\x7e/\x2econfig/fish/aliases\x2efish\x1envim\x20\x7e/\x2econfig/fish/config\x2efish\x1envim\x20\x7e/\x2egitconfig\x1envim\x20\x7e/\x2econfig/fish/variables\x2efish\x1efzf\x1eneofetch\x1explr\x1efloaterm\x1eforgit\x3a\x3aadd\x1eforgit\x3a\x3abranch\x3a\x3adelete\x1eforgit\x3a\x3ablame\x1eforgit\x3a\x3acheckout\x3a\x3abranch\x1eforgit\x3a\x3acheckout\x3a\x3afile\x1eforgit\x3a\x3aclean\x1eforgit\x3a\x3acheckout\x3a\x3acommit\x1eforgit\x3a\x3acherry\x3a\x3apick\x3a\x3afrom\x3a\x3abranch\x1eforgit\x3a\x3acheckout\x3a\x3atag\x1eforgit\x3a\x3adiff\x1eonefetch\x1eforgit\x3a\x3afixup\x1eforgit\x3a\x3aignore\x1eforgit\x3a\x3alog\x1etgpt\x20\x2di\x1eforgit\x3a\x3arebase\x1eforgit\x3a\x3arevert\x3a\x3acommit\x1eforgit\x3a\x3areset\x3a\x3ahead\x1eforgit\x3a\x3astash\x3a\x3apush\x1eforgit\x3a\x3astash\x3a\x3ashow\x1ezi\x1etldr\x1eyay\x20\x2dS\x20\x1eip\x20\x2dc\x20a\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2da\x20\x2d\x2dicons\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2da\x20\x2d\x2dicons\x20\x2dD\x20\x2d\x2dgit\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2d\x2dicons\x20\x2dD\x20\x2d\x2dgit\x1elazygit\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2d\x2dicons\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2da\x20\x2d\x2dicons\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dicons\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2da\x20\x2d\x2dicons\x20\x2d\x2dtree\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2d\x2dicons\x20\x2d\x2dtree\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eunimatrix\x20\x2ds\x2095\x1enavi\x1eexit\x1esvn\x5c\x5c\x5c\x20\x2d\x2dconfig\x2ddir\x5c\x5c\x5c\x20\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x22\x5c\x5c\x5c\x24XDG_CONFIG_HOME\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x22/subversion\x1esysz\x1eyay\x20\x2dR\x20\x1eyay\x20\x2dSyu\x1envim\x1envim\x1eyadm\x20push\x1eyadm\x20add\x1eyarn\x20\x2d\x2duse\x2dyarnrc\x20\x22\x24XDG_CONFIG_HOME/yarn/config\x22\x1eyadm\x20commit\x20\x2dS\x20\x2da\x20\x2dm\x1eyadm\x20merge\x1eyadm\x20pull\x1eyadm\x20status\x1eyadm\x20switch\x1e__zoxide_z\x1e__zoxide_zi
+SETUVAR --export __ABBR_TIPS_KEYS:a__bruh\x1ea__cat\x1ea__cd\x1ea__clock\x1ea__codeinfo\x1ea__disks\x1ea__dots\x1ea__dsize\x1ea__ea\x1ea__ef\x1ea__eg\x1ea__ev\x1ea__f\x1ea__fetch\x1ea__files\x1ea__fsend\x1ea__ga\x1ea__gbd\x1ea__gbl\x1ea__gcb\x1ea__gcf\x1ea__gclean\x1ea__gco\x1ea__gcp\x1ea__gct\x1ea__gd\x1ea__gfetch\x1ea__gfu\x1ea__gi\x1ea__glo\x1ea__gpt\x1ea__grb\x1ea__grc\x1ea__grh\x1ea__gsp\x1ea__gss\x1ea__h\x1ea__info\x1ea__install\x1ea__ip\x1ea__l\x1ea__ld\x1ea__ldh\x1ea__lh\x1ea__ls\x1ea__lsh\x1ea__lt\x1ea__lth\x1ea__matrix\x1ea__q\x1ea__svn\x1ea__sysproc\x1ea__uninstall\x1ea__update\x1ea__vim\x1ea__yP\x1ea__ya\x1ea__yarn\x1ea__yc\x1ea__ym\x1ea__yp\x1ea__yst\x1ea__ysw\x1ea__z\x1ea__zi
+SETUVAR --export __ABBR_TIPS_VALUES:genact\x20\x2ds\x204\x1ebat\x1ez\x1etty\x2dclock\x20\x2dsbc\x1escc\x20\x2e/\x1eduf\x1eyadm\x20enter\x20lazygit\x1edua\x20i\x1envim\x20\x7e/\x2econfig/fish/aliases\x2efish\x1envim\x20\x7e/\x2econfig/fish/config\x2efish\x1envim\x20\x7e/\x2egitconfig\x1envim\x20\x7e/\x2econfig/fish/variables\x2efish\x1efzf\x1eneofetch\x1explr\x1efloaterm\x1eforgit\x3a\x3aadd\x1eforgit\x3a\x3abranch\x3a\x3adelete\x1eforgit\x3a\x3ablame\x1eforgit\x3a\x3acheckout\x3a\x3abranch\x1eforgit\x3a\x3acheckout\x3a\x3afile\x1eforgit\x3a\x3aclean\x1eforgit\x3a\x3acheckout\x3a\x3acommit\x1eforgit\x3a\x3acherry\x3a\x3apick\x3a\x3afrom\x3a\x3abranch\x1eforgit\x3a\x3acheckout\x3a\x3atag\x1eforgit\x3a\x3adiff\x1eonefetch\x1eforgit\x3a\x3afixup\x1eforgit\x3a\x3aignore\x1eforgit\x3a\x3alog\x1etgpt\x20\x2di\x1eforgit\x3a\x3arebase\x1eforgit\x3a\x3arevert\x3a\x3acommit\x1eforgit\x3a\x3areset\x3a\x3ahead\x1eforgit\x3a\x3astash\x3a\x3apush\x1eforgit\x3a\x3astash\x3a\x3ashow\x1ezi\x1etldr\x1eyay\x20\x2dS\x20\x1eip\x20\x2dc\x20a\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2da\x20\x2d\x2dicons\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2da\x20\x2d\x2dicons\x20\x2dD\x20\x2d\x2dgit\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2d\x2dicons\x20\x2dD\x20\x2d\x2dgit\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2d\x2dicons\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2da\x20\x2d\x2dicons\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dicons\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2da\x20\x2d\x2dicons\x20\x2d\x2dtree\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eeza\x20\x2d\x2dlong\x20\x2d\x2dheader\x20\x2d\x2dicons\x20\x2d\x2dtree\x20\x2d\x2dgit\x20\x2d\x2dgroup\x2ddirectories\x2dfirst\x1eunimatrix\x20\x2ds\x2095\x1eexit\x1esvn\x5c\x5c\x5c\x20\x2d\x2dconfig\x2ddir\x5c\x5c\x5c\x20\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x22\x5c\x5c\x5c\x24XDG_CONFIG_HOME\x5c\x5c\x5c\x5c\x5c\x5c\x5c\x22/subversion\x1esysz\x1eyay\x20\x2dR\x20\x1eyay\x20\x2dSyu\x1envim\x1eyadm\x20push\x1eyadm\x20add\x1eyarn\x20\x2d\x2duse\x2dyarnrc\x20\x22\x24XDG_CONFIG_HOME/yarn/config\x22\x1eyadm\x20commit\x20\x2dS\x20\x2da\x20\x2dm\x1eyadm\x20merge\x1eyadm\x20pull\x1eyadm\x20status\x1eyadm\x20switch\x1e__zoxide_z\x1e__zoxide_zi
 SETUVAR __fish_initialized:3400
 SETUVAR _fisher_acomagu_2F_fish_2D_async_2D_prompt_files:\x7e/\x2econfig/fish/conf\x2ed/__async_prompt\x2efish
 SETUVAR _fisher_danhper_2F_fish_2D_ssh_2D_agent_files:\x7e/\x2econfig/fish/functions/__ssh_agent_is_started\x2efish\x1e\x7e/\x2econfig/fish/functions/__ssh_agent_start\x2efish\x1e\x7e/\x2econfig/fish/conf\x2ed/fish\x2dssh\x2dagent\x2efish
 SETUVAR _fisher_franciscolourenco_2F_done_files:\x7e/\x2econfig/fish/conf\x2ed/done\x2efish
 SETUVAR _fisher_gazorby_2F_fish_2D_abbreviation_2D_tips_files:\x7e/\x2econfig/fish/functions/__abbr_tips_bind_newline\x2efish\x1e\x7e/\x2econfig/fish/functions/__abbr_tips_bind_space\x2efish\x1e\x7e/\x2econfig/fish/functions/__abbr_tips_clean\x2efish\x1e\x7e/\x2econfig/fish/functions/__abbr_tips_init\x2efish\x1e\x7e/\x2econfig/fish/conf\x2ed/abbr_tips\x2efish
 SETUVAR _fisher_joehillen_2F_to_2D_fish_files:\x7e/\x2econfig/fish/functions/to\x2efish\x1e\x7e/\x2econfig/fish/conf\x2ed/to\x2efish\x1e\x7e/\x2econfig/fish/completions/to\x2efish
+SETUVAR _fisher_paldepind_2F_projectdo_files:\x7e/\x2econfig/fish/functions/projectdo_build\x2efish\x1e\x7e/\x2econfig/fish/functions/projectdo_run\x2efish\x1e\x7e/\x2econfig/fish/functions/projectdo_test\x2efish\x1e\x7e/\x2econfig/fish/functions/projectdo_tool\x2efish\x1e\x7e/\x2econfig/fish/completions/projectdo\x2efish
 SETUVAR _fisher_patrickf1_2F_fzf_2E_fish_files:\x7e/\x2econfig/fish/functions/_fzf_configure_bindings_help\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_extract_var_info\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_preview_changed_file\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_preview_file\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_report_diff_type\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_report_file_type\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_search_directory\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_search_git_log\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_search_git_status\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_search_history\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_search_processes\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_search_variables\x2efish\x1e\x7e/\x2econfig/fish/functions/_fzf_wrapper\x2efish\x1e\x7e/\x2econfig/fish/functions/fzf_configure_bindings\x2efish\x1e\x7e/\x2econfig/fish/conf\x2ed/fzf\x2efish\x1e\x7e/\x2econfig/fish/completions/fzf_configure_bindings\x2efish
-SETUVAR _fisher_plugins:franciscolourenco/done\x1eacomagu/fish\x2dasync\x2dprompt\x1ejoehillen/to\x2dfish\x1epatrickf1/fzf\x2efish\x1ewfxr/forgit\x1edanhper/fish\x2dssh\x2dagent\x1egazorby/fish\x2dabbreviation\x2dtips
+SETUVAR _fisher_plugins:franciscolourenco/done\x1eacomagu/fish\x2dasync\x2dprompt\x1ejoehillen/to\x2dfish\x1epatrickf1/fzf\x2efish\x1ewfxr/forgit\x1edanhper/fish\x2dssh\x2dagent\x1egazorby/fish\x2dabbreviation\x2dtips\x1epaldepind/projectdo
 SETUVAR _fisher_upgraded_to_4_4:\x1d
 SETUVAR _fisher_wfxr_2F_forgit_files:\x7e/\x2econfig/fish/conf\x2ed/bin\x1e\x7e/\x2econfig/fish/conf\x2ed/forgit\x2eplugin\x2efish\x1e\x7e/\x2econfig/fish/completions/_git\x2dforgit\x1e\x7e/\x2econfig/fish/completions/git\x2dforgit\x2ebash\x1e\x7e/\x2econfig/fish/completions/git\x2dforgit\x2ezsh
 SETUVAR fish_color_autosuggestion:6e738d
diff --git a/.config/fish/functions/projectdo_build.fish b/.config/fish/functions/projectdo_build.fish
new file mode 100644
index 00000000..21ce2921
--- /dev/null
+++ b/.config/fish/functions/projectdo_build.fish
@@ -0,0 +1,3 @@
+function projectdo_build
+  projectdo -d build
+end
diff --git a/.config/fish/functions/projectdo_run.fish b/.config/fish/functions/projectdo_run.fish
new file mode 100644
index 00000000..2a73e98a
--- /dev/null
+++ b/.config/fish/functions/projectdo_run.fish
@@ -0,0 +1,3 @@
+function projectdo_run
+  projectdo -d run
+end
diff --git a/.config/fish/functions/projectdo_test.fish b/.config/fish/functions/projectdo_test.fish
new file mode 100644
index 00000000..680e18b1
--- /dev/null
+++ b/.config/fish/functions/projectdo_test.fish
@@ -0,0 +1,3 @@
+function projectdo_test
+  projectdo -d test
+end
diff --git a/.config/fish/functions/projectdo_tool.fish b/.config/fish/functions/projectdo_tool.fish
new file mode 100644
index 00000000..3d37d66e
--- /dev/null
+++ b/.config/fish/functions/projectdo_tool.fish
@@ -0,0 +1,3 @@
+function projectdo_tool
+  projectdo -d tool
+end
diff --git a/.local/bin/projectdo b/.local/bin/projectdo
new file mode 100755
index 00000000..4cc890d4
--- /dev/null
+++ b/.local/bin/projectdo
@@ -0,0 +1,385 @@
+#!/bin/sh
+
+# projectdo – universal project commands.
+# Copyright (C) 2019-present  Simon Friis Vindum
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+VERSION="0.2.0"
+
+# Global mutable variables.
+QUIET=false
+DRY_RUN=false
+PROJECT_ROOT="${PROJECT_ROOT:-}"
+ACTION=""
+TOOL_ARGS="" # Arguments to pass along to the tool
+IS_TOOL=false # True if ACTION is 'tool' as this action is somewhat special.
+
+has_command() {
+  command -v "$1" >/dev/null 2>&1
+}
+
+# When running the appropriate external tool this function is used which
+# evaluates the given command while respecting $QUIET and $DRY_RUN.
+execute() {
+  if [ $QUIET = false ]; then
+    echo "$1" $TOOL_ARGS
+  fi
+  if [ $DRY_RUN = false ]; then
+    if [ $QUIET = false ]; then
+      eval "$1" $TOOL_ARGS
+    else
+      eval "$1" $TOOL_ARGS > /dev/null
+    fi
+  fi
+}
+
+# Takes the name of a tool and an action. If the action is `tool` it is
+# ignored. It handles the common case where the tool is invoked as `tool
+# action`.
+execute_command() {
+  if [ "$2" = tool ]; then
+    execute "$1"
+  else
+    execute "$1 $2"
+  fi
+  exit 0
+}
+
+# Every supported tool requires a function `try_tool` where `tool` is a name
+# indicating what tool the function tries to detect. The function should:
+#
+# * Return if it does not detect that the tool is appropriate.
+# * Read the variables `ACTION` and `IS_TOOL` to determine the correct action
+#   to run.
+# * When running an action is should use the `execute` function and _exit_ when
+#   it is done.
+
+# Start list of tools
+
+# JavaScript + NodeJS
+
+try_nodejs() {
+  if [ ! -f package.json ]; then
+    return 1
+  fi
+  if [ -f yarn.lock ]; then
+    tool=yarn
+  else
+    tool=npm
+  fi
+  if ! has_command $tool; then
+    echo "Found a package.json file but '$tool' is not installed."
+    exit 1
+  fi
+  local node_action="$ACTION"
+  # Only the "run" action need translation, the others match 1-to-1
+  if [ "$ACTION" = run ]; then
+    node_action=start
+  fi
+  # We check if the package.json file contains an appropriate script. We use
+  # grep for this. The check is not 100% bulletproof, but it's very close. We
+  # could've used `npm run` to get the authorative list of the scripts but
+  # invoking `npm` is two orders of magnitude slower which leads to a
+  # noticeable delay.
+  if ! $IS_TOOL && ! grep -q "^[[:space:]]*\"${node_action}\":" package.json; then
+    return 0
+  fi
+  execute_command "$tool" "$node_action"
+}
+
+# Rust + Cargo
+
+try_cargo() {
+  if [ -f Cargo.toml ]; then
+    execute_command cargo "$ACTION"
+  fi
+}
+
+# CMake
+
+try_cmake() {
+  if [ -f CMakeLists.txt ] && [ "$ACTION" = test ]; then
+    if [ -f build ]; then
+      execute "cmake --build build --target test"
+    else
+      execute "cmake --build . --target test"
+    fi
+    exit
+  fi
+}
+
+# Haskell + Stack
+
+try_stack() {
+  if [ -f package.yaml ] && [ -f stack.yaml ]; then
+    execute_command stack "$ACTION"
+  fi
+}
+
+# Haskell + Cabal
+
+try_cabal() {
+  cabal_file="$(find ./ -maxdepth 1 -name "*.cabal" 2> /dev/null | wc -l)"
+  if [ "$cabal_file" -gt 0 ] && [ ! -f stack.yml ]; then
+    execute_command cabal "$ACTION"
+  fi
+}
+
+# Maven
+
+try_maven() {
+  if [ -f pom.xml ]; then
+    case $ACTION in
+      build)
+        execute "mvn compile"
+        exit ;;
+      test)
+        execute "mvn test"
+        exit ;;
+      run)
+        echo "projectdo does not know how to run a project with Maven."
+        exit
+    esac
+  fi
+}
+
+# Clojure + Leiningen
+
+try_lein() {
+  if [ -f project.clj ] && [ "$ACTION" = test ]; then
+    execute "lein test"
+  fi
+}
+
+# Makefile
+
+has_make_target() {
+    target="${1?}"
+    output=$(make -n "${target}" 2>&1)
+    exit_code=$?
+    if [ $exit_code -ne 0 ]; then
+        return $exit_code
+    fi
+
+    # If there is a file with the name of the target we're looking for but no
+    # actual target with that name, make will exit successfully with that
+    # message. We need to consider that case as a "target not found". Note that
+    # the way the target is quoted in the output (`test' vs 'test') can differ
+    # across OSes so we only check a prefix up to the problematic quotes.
+    if expr "$output" : "make: Nothing to be done for" 1> /dev/null; then
+        return 1
+    fi
+
+    return 0
+}
+
+try_makefile() {
+  if [ -f Makefile ]; then
+    if ! has_command "make"; then
+      echo "Found a Makefile but 'make' is not installed."
+      exit 1
+    fi
+    if $IS_TOOL || [ "$ACTION" = build ]; then
+      # For make "build" is the default action when running `make`
+      execute "make"
+      exit
+    elif [ "$ACTION" = test ]; then
+      # Let's see if the makefile contains a test or check target
+      if has_make_target "test"; then
+        execute "make test"
+        exit
+      elif has_make_target "check"; then
+        execute "make check"
+        exit
+      fi
+    fi
+  fi
+  return 1
+}
+
+# Python
+
+try_python() {
+  if [ -f pyproject.toml ]; then
+    if grep -q -m 1 "^\[tool.poetry\]$" pyproject.toml; then
+      case $ACTION in
+        build)
+          execute "poetry build"
+          exit ;;
+        test)
+          # TODO: There are other Python test frameworks, it would be nice to
+          # detect and run the right one.
+          execute "poetry run pytest"
+          exit ;;
+        run)
+          echo "projectdo does not know how to run a project with Poetry."
+          exit
+      esac
+    else
+      echo "Found a pyproject.toml file but projectdo is not sure how to run it."
+      exit
+    fi
+    return 1
+  fi
+}
+
+# Go
+
+try_go() {
+  if [ -f go.mod ] && [ "$ACTION" = test ]; then
+    # We detect Makefiles before we detect Go, so here we know that the Go
+    # project is _not_ tested by a Makefile.
+
+    # Check if the project uses Mage. A magefile could in theory have any name,
+    # but `magefile.go` seems to be the convention.
+    if grep -q -m 1 '^func Check(' magefile.go; then
+      execute "mage check"
+      exit
+    elif grep -q -m 1 '^func Test(' magefile.go; then
+      execute "mage test"
+      exit
+    fi
+    execute "go test"
+    exit
+  fi
+}
+
+# LaTeX
+
+try_latex() {
+  if [ -f Tectonic.toml ] && [ "$ACTION" = build ]; then
+      execute "tectonic -X build"
+      exit
+  fi
+}
+
+# End of list of tools
+
+detect_and_run() {
+  try_nodejs
+  try_cargo
+  try_stack
+  try_cabal
+  try_cmake
+  try_maven
+  try_lein
+  try_makefile
+  try_python
+  try_go
+  try_latex
+}
+
+set_project_root() {
+  if [ -n "$PROJECT_ROOT" ]; then
+    return
+  fi
+
+  if has_command git; then
+    # Find the root of the git repository if we're inside one. If we're in a
+    # git submodule then the root of the outer git repo is used. If we're not
+    # in a git repo the git command will not output anything and $PROJECT_ROOT
+    # is set to the empty string which is fine.
+    PROJECT_ROOT=$(git rev-parse --show-superproject-working-tree --show-toplevel 2> /dev/null | head -n 1)
+  fi
+}
+
+nothing_found() {
+  echo "No way to $ACTION found :'("
+  exit 1
+}
+
+display_version() {
+  echo "$(basename "$0") version $VERSION"
+}
+
+display_help() {
+  echo "Usage: $(basename "$0") [options] [action] [tool-arguments]
+Options:
+  -h, --help             Display this help.
+  -n, -d, --dry-run      Do not execute any commands with side-effects.
+  -q, --quiet            Do not print commands as they are about to be executed.
+  -v, --version          Display the version of the program (which is $VERSION).
+
+Actions:
+  build, run, test       Build, run, or test the current project.
+  tool                   Invoke the guessed tool for the current project.
+
+Tool arguments:
+  Any arguments following [action] are passed along to the invoked tool."
+}
+
+# Main execution starts here
+
+while getopts dhnqv-: c
+do
+  case $c in
+    d) DRY_RUN=true ;;
+    h) display_help; exit 0 ;;
+    n) DRY_RUN=true ;;
+    q) QUIET=true ;;
+    v) display_version; exit 0 ;;
+    -) case $OPTARG in
+         help) display_help; exit 0 ;;
+         dry-run) DRY_RUN=true ;;
+         quiet) QUIET=true ;;
+         version) display_version; exit 0 ;;
+         '' ) break ;; # "--" should terminate argument processing
+         * ) echo "Illegal option --$OPTARG" >&2; exit 1 ;;
+      esac ;;
+    \?) exit 1 ;;
+  esac
+done
+
+shift $((OPTIND-1)) # Shift away the parsed option arguments
+
+if [ "$1" = test ] ||
+   [ "$1" = run ] ||
+   [ "$1" = build ] ||
+   [ "$1" = tool ]; then
+  ACTION=$1
+  if [ "$1" = tool ]; then
+    IS_TOOL=true
+  fi
+  shift 1 # Remove the action from the arguments
+  TOOL_ARGS=$@
+else
+  if [ -z "$1" ]; then
+    echo "No action specified."
+  else
+    echo "$1 is not a valid action."
+  fi
+  echo ""
+  echo "The valid actions are: build, run, test, tool"
+  echo ""
+  echo "Example: projectdo test"
+  exit 1
+fi
+
+set_project_root
+
+while :
+do
+  # We don't want to do anything if we are in the home or root directory
+  if [ "$PWD" = "$HOME" ] || [ "$PWD" = / ]; then
+    nothing_found
+  fi
+  detect_and_run
+  # If we didn't detect a tool to run in this directory we go up one directory
+  # while ensuring that we don't leave the project root
+  if [ "$PWD" = "$PROJECT_ROOT" ]; then
+    nothing_found
+  fi
+  cd ..
+done